publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2016-06-21 | A stochastic model of supercoiling-dependent transcription | We propose a stochastic model for gene transcription coupled to DNA
supercoiling, where we incorporate the experimental observation that
polymerases create supercoiling as they unwind the DNA helix, and that these
enzymes bind more favourably to regions where the genome is unwound. Within
this model, we show that when ... | 1606.06555v3 |
2016-06-22 | Induced magnetization and power loss for a periodically driven system of ferromagnetic nanoparticles with randomly oriented easy axes | We study the effect of an elliptically polarized magnetic field on a system
of non-interacting, single-domain ferromagnetic nanoparticles characterized by
a uniform distribution of easy axis directions. Our main goal is to determine
the average magnetization of this system and the power loss in it. In order to
calculat... | 1606.07131v1 |
2016-07-20 | Performance of Topological Insulator Interconnects | The poor performance of copper interconnects at the nanometer scale calls for
new material solutions for continued scaling of integrated circuits. We propose
the use of three dimensional time-reversal-invariant topological insulators
(TIs), which host backscattering-protected surface states, for this purpose.
Using sem... | 1607.06131v2 |
2016-07-21 | Rate-distance tradeoff for codes above graph capacity | The capacity of a graph is defined as the rate of exponential growth of
independent sets in the strong powers of the graph. In the strong power an edge
connects two sequences if at each position their letters are equal or adjacent.
We consider a variation of the problem where edges in the power graphs are
removed betwe... | 1607.06384v1 |
2016-07-25 | A geometric approach to optimal nonequilibrium control: Minimizing dissipation in nanomagnetic spin systems | Optimal control of nanomagnets has become an urgent problem for the field of
spintronics as technological tools approach thermodynamically determined limits
of efficiency. In complex, fluctuating systems, like nanomagnetic bits, finding
optimal protocols is challenging, requiring detailed information about the
dynamica... | 1607.07425v1 |
2016-08-02 | Affordable echelle spectroscopy of the eccentric HAT-P-2, WASP-14 and XO-3 planetary systems with a sub-meter-class telescope | A new off-shelf low-cost echelle spectrograph was installed recently on the
0.6m telescope at the Star\'a Lesn\'a Observatory (Slovakia). In this paper we
describe in details the radial velocity (RV) analysis of the first three
transiting planetary systems, HAT-P-2, WASP-14 and XO-3, observed with this
instrument. Furt... | 1608.00745v1 |
2016-08-06 | High current, high efficiency graded band gap perovskite solar cells | Organic-inorganic halide perovskite materials have emerged as attractive
alternatives to conventional solar cell building blocks. Their high light
absorption coefficients and long diffusion lengths suggest high power
conversion efficiencies (PCE),1-5 and indeed perovskite-based single band gap
and tandem solar cell des... | 1608.02150v1 |
2016-08-09 | Existence of weak solutions to an evolutionary model for magnetoelasticity | We prove existence of weak solutions to an evolutionary model derived for
magnetoelastic materials. The model is phrased in Eulerian coordinates and
consists in particular of (i) a Navier-Stokes equation that involves magnetic
and elastic terms in the stress tensor obtained by a variational approach, of
(ii) a regulari... | 1608.02992v1 |
2016-08-16 | Magnetic Yoking and Tunable Interactions in FePt-Based Hard/Soft Bilayers | Assessing and controlling magnetic interactions in magnetic nanostructures
are critical to nanomagnetic and spintronic explorations, such as magnetic
recording media, permanent magnets, magnetic memory and logic devices, etc.
Here we demonstrate an extremely sensitive magnetic yoking effect and tunable
interactions in ... | 1608.04630v1 |
2016-08-17 | Current-induced instability of domain walls in cylindrical nanowires | We study the current-driven domain wall (DW) motion in cylindrical nanowires
using micromagnetic simulations by implementing the Landau-Lifshitz-Gilbert
equation with nonlocal spin-transfer torque in a finite difference
micromagnetic package. We find that in the presence of DW Gaussian wave packets
(spin waves) will be... | 1608.04876v2 |
2016-08-22 | Disorder Induced Phase Transitions of Type-II Weyl Semimetal | Weyl semimetals are a newly discovered class of materials that host
relativistic massless Weyl fermions as their low-energy bulk excitations. Among
this new class of materials, there exist two general types of semimetals that
are of particular interest: type-I Weyl semimetals, that have broken inversion
or time-reversa... | 1608.06311v1 |
2016-08-25 | Convergence of a mass-lumped finite element method for the Landau-Lifshitz equation | The dynamics of the magnetic distribution in a ferromagnetic material is
governed by the Landau-Lifshitz equation, which is a nonlinear geometric
dispersive equation with a nonconvex constraint that requires the magnetization
to remain of unit length throughout the domain. In this article, we present a
mass-lumped fini... | 1608.07312v3 |
2016-08-30 | LiRa: A New Likelihood-Based Similarity Score for Collaborative Filtering | Recommender system data presents unique challenges to the data mining,
machine learning, and algorithms communities. The high missing data rate, in
combination with the large scale and high dimensionality that is typical of
recommender systems data, requires new tools and methods for efficient data
analysis. Here, we a... | 1608.08646v2 |
2016-09-09 | An Empirical Study of Cycle Toggling Based Laplacian Solvers | We study the performance of linear solvers for graph Laplacians based on the
combinatorial cycle adjustment methodology proposed by
[Kelner-Orecchia-Sidford-Zhu STOC-13]. The approach finds a dual flow solution
to this linear system through a sequence of flow adjustments along cycles. We
study both data structure orien... | 1609.02957v1 |
2016-09-21 | Harmonic space analysis of pulsar timing array redshift maps | In this paper, we propose a new framework for treating the angular
information in the pulsar timing array response to a gravitational wave
background based on standard cosmic microwave background techniques. We
calculate the angular power spectrum of the all-sky gravitational redshift
pattern induced at the earth for b... | 1609.06758v2 |
2016-09-22 | Ultrafast generation of skyrmionic defects with vortex beams: printing laser profiles on magnets | Controlling electric and magnetic properties of matter by laser beams is
actively explored in the broad region of condensed matter physics, including
spintronics and magneto-optics. Here we theoretically propose an application of
optical and electron vortex beams carrying intrinsic orbital angular momentum
to chiral fe... | 1609.06816v3 |
2016-10-02 | Syntactic Structures and Code Parameters | We assign binary and ternary error-correcting codes to the data of syntactic
structures of world languages and we study the distribution of code points in
the space of code parameters. We show that, while most codes populate the lower
region approximating a superposition of Thomae functions, there is a
substantial pres... | 1610.00311v1 |
2016-10-03 | Linear dynamics of classical spin as Möbius transformation | Although the overwhelming majority of natural processes occurs far from the
equilibrium, general theoretical approaches to non-equilibrium phase
transitions remain scarce. Recent breakthroughs introducing description of open
dissipative systems in terms of non-Hermitian quantum mechanics allowed to
identify a class of ... | 1610.00762v1 |
2016-10-11 | Self-Consistent Field Theory studies of the thermodynamics and quantum spin dynamics of magnetic Skyrmions | A self-consistent field theory is introduced and used to investigate the
thermodynamics and spin dynamics of an $S = 1$ quantum spin system with a
magnetic Skyrmion. The temperature dependence of the Skyrmion profile as well
as the phase diagram are calculated. It is shown that the Skyrmion carries a
phase transition t... | 1610.03191v2 |
2016-10-12 | Variational approximation of functionals defined on 1-dimensional connected sets: the planar case | In this paper we consider variational problems involving 1-dimensional
connected sets in the Euclidean plane, such as the classical Steiner tree
problem and the irrigation (Gilbert-Steiner) problem. We relate them to optimal
partition problems and provide a variational approximation through
Modica-Mortola type energies... | 1610.03839v5 |
2016-10-24 | Field-free, spin-current control of magnetization in non-collinear chiral antiferromagnets | Non-collinear chiral antiferromagnets like Mn3Sn and Mn3Ge are known to show
gigantic anomalous Hall response depending on the orientation of their inverse
chiral magnetic order of Mn atoms in Kagome layers. Here we study the stability
of such magnetic order in the absence of external magnetic fields on the basis
of st... | 1610.07615v2 |
2016-11-04 | Struwe-like solutions for the Stochastic Harmonic Map Flow | We give a new result on the well-posedness of the two-dimensional Stochastic
Harmonic Map flow, whose study is motivated by the Landau-Lifshitz-Gilbert
model for thermal fluctuations in micromagnetics. We construct strong solutions
that belong locally to the spaces $C([s,t);H^1)\cap L^2([s,t);H^2)$, $0\leq
s<t\leq T$. ... | 1611.01565v2 |
2016-11-07 | Compactness results for static and dynamic chiral skyrmions near the conformal limit | We examine lower order perturbations of the harmonic map prob- lem from
$\mathbb{R}^2$ to $\mathbb{S}^2$ including chiral interaction in form of a
helicity term that prefers modulation, and a potential term that enables decay
to a uniform background state. Energy functionals of this type arise in the
context of magneti... | 1611.01984v1 |
2016-11-08 | A variational method for spectral functions | The Generalized Eigenvalue Problem (GEVP) has been used extensively in the
past in order to reliably extract energy levels from time-dependent Euclidean
correlators calculated in Lattice QCD. We propose a formulation of the GEVP in
frequency space. Our approach consists of applying the model-independent
Backus-Gilbert ... | 1611.02499v1 |
2016-11-14 | Hidden fluctuations close to a quantum bicritical point | In this paper we describe physical properties arising in the vicinity of two
coupled quantum phase transitions. We consider a phenomenological model based
on two scalar order parameter fields locally coupled biquadratically and having
a common quantum critical point as a function of a quantum tuning parameter
such as p... | 1611.04621v2 |
2016-11-22 | New bounds of permutation codes under Hamming metric and Kendall's $τ$-metric | Permutation codes are widely studied objects due to their numerous
applications in various areas, such as power line communications, block
ciphers, and the rank modulation scheme for flash memories. Several kinds of
metrics are considered for permutation codes according to their specific
applications. This paper concer... | 1611.07188v1 |
2016-12-01 | Encoding orbital angular momentum of light in magnets | Breaking the diffraction limit and focusing laser beams to subwavelength
scale are becoming possible with the help of recent developments in plasmonics.
Such subwavelength focusing bridges different length scales of laser beams and
matter. Here we consider optical vortex, or laser beam carrying orbital angular
momentum... | 1612.00176v2 |
2016-12-26 | Credibility and Dynamics of Collective Attention | Today, social media provide the means by which billions of people experience
news and events happening around the world. However, the absence of traditional
journalistic gatekeeping allows information to flow unencumbered through these
platforms, often raising questions of veracity and credibility of the reported
infor... | 1612.08440v1 |
2017-01-07 | Modulation calorimetry in diamond anvil cells I: heat flow models | Numerical simulations of heat transport in diamond anvil cells reveal a
possibility for absolute measurements of specific heat via high-frequency
modulation calorimetry. Such experiments could reveal and help characterize
temperature-driven phase transitions at high-pressure, such as melting, the
glass transition, magn... | 1701.01872v1 |
2017-01-08 | Topological crystalline superconductors with linearly and projectively represented $C_{n}$ symmetry | We study superconductors with $n$-fold rotational invariance both in the
presence and in the absence of spin-orbit interactions. More specifically, we
classify the non-interacting Hamiltonians by defining a series of $Z$-numbers
for the Bogoliubov-de Gennes (BdG) symmetry classes of the Altland-Zimbauer
classification ... | 1701.01944v1 |
2017-01-09 | Temperature dependence of shear viscosity of $SU(3)$--gluodynamics within lattice simulation | In this paper we study the shear viscosity temperature dependence of
$SU(3)$--gluodynamics within lattice simulation. To do so, we measure the
correlation functions of energy-momentum tensor in the range of temperatures
$T/T_c\in [0.9, 1.5]$. To extract the values of shear viscosity we used two
approaches. The first on... | 1701.02266v2 |
2017-01-25 | Statistical Decoding | The security of code-based cryptography relies primarily on the hardness of
generic decoding with linear codes. The best generic decoding algorithms are
all improvements of an old algorithm due to Prange: they are known under the
name of information set decoding techniques (ISD). A while ago a generic
decoding algorith... | 1701.07416v2 |
2017-02-03 | Enhanced Spin Conductance of a Thin-Film Insulating Antiferromagnet | We investigate spin transport by thermally excited spin waves in an
antiferromagnetic insulator. Starting from a stochastic Landau-Lifshitz-Gilbert
phenomenology, we obtain the out-of-equilibrium spin-wave properties. In linear
response to spin biasing and a temperature gradient, we compute the spin
transport through a... | 1702.00975v2 |
2017-02-07 | Giant-spin nonlinear response theory of magnetic nanoparticle hyperthermia: a field dependence study | Understanding high-field amplitude electromagnetic heat loss phenomena is of
great importance, in particular in the biomedical field, since the
heat-delivery treatment plans might rely on analytical models that are only
valid at low field amplitudes. Here, we develop a nonlinear response model
valid for single- domain ... | 1702.02022v1 |
2017-02-17 | Spin-orbit torque in MgO/CoFeB/Ta/CoFeB/MgO symmetric structure with interlayer antiferromagnetic coupling | Spin current generated by spin Hall effect in the heavy metal would diffuse
up and down to adjacent ferromagnetic layers and exert torque on their
magnetization, called spin-orbit torque. Antiferromagnetically coupled
trilayers, namely the so-called synthetic antiferromagnets (SAF), are usually
employed to serve as the... | 1702.05331v1 |
2017-02-19 | Multiscale simulations of topological transformations in magnetic Skyrmions | Magnetic Skyrmions belong to the most interesting spin structures for the
development of future information technology as they have been predicted to be
topologically protected. To quantify their stability, we use an innovative
multiscale approach to simulating spin dynamics based on the
Landau-Lifshitz-Gilbert equatio... | 1702.05767v1 |
2017-02-21 | Spin texture motion in antiferromagnetic and ferromagnetic nanowires | We propose a Hamiltonian dynamics formalism for the current and magnetic
field driven dynamics of ferromagnetic and antiferromagnetic domain walls in
one dimensional systems. To demonstrate the power of this formalism, we derive
Hamilton equations of motion via Poisson brackets based on the
Landau-Lifshitz-Gilbert phen... | 1702.06274v1 |
2017-02-23 | Fulde-Ferrell States in Inverse Proximity Coupled Magnetically-Doped Topological Heterostructures | We study the superconducting properties of the thin film BCS superconductor
proximity coupled to a magnetically doped topological insulator(TI). Using the
mean field theory, we show that Fulde-Ferrell(FF) pairing can be induced in the
conventional superconductor by having inverse proximity effect(IPE). This
occurs when... | 1702.07383v1 |
2017-02-27 | Quantum critical scaling and fluctuations in Kondo lattice materials | We propose a new phenomenological framework for three classes of Kondo
lattice materials that incorporates the interplay between the fluctuations
associated with the antiferromagnetic quantum critical point and those produced
by the hybridization quantum critical point that marks the end of local moment
behavior. We sh... | 1702.08132v2 |
2017-03-09 | On linear complementary-dual multinegacirculant codes | Linear codes with complementary-duals (LCD) are linear codes that intersect
with their dual trivially. Multinegacirculant codes of index $2$ that are LCD
are characterized algebraically and some good codes are found in this family.
Exact enumeration is performed for indices 2 and 3, and for all indices $t$ for
a specia... | 1703.03115v1 |
2017-03-16 | Electronic transport in a two-dimensional superlattice engineered via self-assembled nanostructures | Nanoscience offers a unique opportunity to design modern materials from the
bottom up, via low-cost, solution processed assembly of nanoscale building
blocks. These systems promise electronic band structure engineering using not
only the nanoscale structural modulation, but also the mesoscale spatial
patterning, althou... | 1703.05689v3 |
2017-03-27 | Dipolar ferromagnetism in three-dimensional superlattices of nanoparticles | A series of atomistic finite temperature simulations on a model of an FCC
lattice of maghemite nanoparticles using the stochastic Landau-Lifshitz-Gilbert
(sLLG) equation are presented. The model exhibits a ferromagnetic transition
that is in good agreement with theoretical expectations. The simulations also
reveal an o... | 1703.09290v1 |
2017-03-06 | Ultralow Energy Analog Straintronics Using Multiferroic Composites | Electric field-induced magnetization switching in multiferroics holds
profound promise for ultra-low-energy computing in beyond Moore's law era.
Bistable nanomagnets in the multiferroics are usually deemed to be suitable for
storing a binary bit of information and switching between the two stable states
allows us to pr... | 1704.02337v1 |
2017-04-12 | The gradient condition and the contribution of the dynamical part of Green-Kubo formula to the diffusion coefficient | In the diffusive hydrodynamic limit for a symmetric interacting particle
system (such as the exclusion process, the zero range process, the stochastic
Ginzburg-Landau model, the energy exchange model), a possibly non-linear
diffusion equation is derived as the hydrodynamic equation. The bulk diffusion
coefficient of th... | 1704.03745v2 |
2017-04-12 | The Origin of Sequential Chromospheric Brightenings | Sequential chromospheric brightenings (SCBs) are often observed in the
immediate vicinity of erupting flares and are associated with coronal mass
ejections. Since their initial discovery in 2005, there have been several
subsequent investigations of SCBs. These studies have used differing detection
and analysis techniqu... | 1704.03828v1 |
2017-04-12 | Relationships Between Sequential Chromospheric Brightening and the Corona | The chromosphere is a complex region that acts as an intermediary between the
magnetic flux emergence in the photosphere and the magnetic features seen in
the corona. Large eruptions in the chromosphere of flares and filaments are
often accompanied by ejections of coronal mass off the sun. Several studies
have observed... | 1704.03835v1 |
2017-05-16 | Constructive mathematics | This text is reproduced with the kind permission of Fran\c{c}ois Ap\'ery.
It was originally edited by Fran\c{c}ois Gu\'enard and Gilbert Leli\`evre for
the book "Penser les math\'ematiques".
It is the modified and abridged version of a text that appeared previously as
S\'eminaire de philosophie et math\'ematiques d... | 1705.05581v2 |
2017-05-17 | Magnetic-Visual Sensor Fusion based Medical SLAM for Endoscopic Capsule Robot | A reliable, real-time simultaneous localization and mapping (SLAM) method is
crucial for the navigation of actively controlled capsule endoscopy robots.
These robots are an emerging, minimally invasive diagnostic and therapeutic
technology for use in the gastrointestinal (GI) tract. In this study, we
propose a dense, n... | 1705.06196v2 |
2017-05-21 | First-Order Reversal Curves of the Magnetostructural Phase Transition in FeTe | We apply the first-order reversal curve (FORC) method, borrowed from studies
of ferromagnetic materials, to the magneto-structural phase transition of FeTe.
FORC measurements reveal two features in the hysteretic phase transition, even
in samples where traditional temperature measurements display only a single
transiti... | 1705.07380v1 |
2017-05-24 | Towards Understanding the Invertibility of Convolutional Neural Networks | Several recent works have empirically observed that Convolutional Neural Nets
(CNNs) are (approximately) invertible. To understand this approximate
invertibility phenomenon and how to leverage it more effectively, we focus on a
theoretical explanation and develop a mathematical model of sparse signal
recovery that is c... | 1705.08664v1 |
2017-03-06 | Ultra-low-energy Electric field-induced Magnetization Switching in Multiferroic Heterostructures | Electric field-induced magnetization switching in multiferroics is intriguing
for both fundamental studies and potential technological applications. Here, we
review the recent developments on electric field-induced magnetization
switching in multiferroic heterostructures. Particularly, we study the dynamics
of magnetiz... | 1706.03039v1 |
2017-06-11 | Local List Recovery of High-rate Tensor Codes and Applications | In this work, we give the first construction of high-rate locally
list-recoverable codes. List-recovery has been an extremely useful building
block in coding theory, and our motivation is to use these codes as such a
building block. In particular, our construction gives the first
capacity-achieving locally list-decodab... | 1706.03383v1 |
2017-05-31 | Local Differential Privacy for Physical Sensor Data and Sparse Recovery | In this work we explore the utility of locally differentially private thermal
sensor data. We design a locally differentially private recovery algorithm for
the 1-dimensional, discrete heat source location problem and analyse its
performance in terms of the Earth Mover Distance error. Our work indicates that
it is poss... | 1706.05916v4 |
2017-06-22 | High-performance nanoscale topological energy transduction | The realization of high-performance, small-footprint, on-chip inductors
remains a challenge in radio-frequency and power microelectronics, where they
perform vital energy transduction in filters and power converters. Modern
planar inductors consist of metallic spirals that consume significant chip
area, resulting in lo... | 1706.07381v1 |
2017-06-28 | Extension and Applications of a Variational Approach with Deformed Derivatives | We have recently presented an extension of the standard variational calculus
to include the presence of deformed derivatives in the Lagrangian of a system
of particles and in the Lagrangian density of field-theoretic models. Classical
Euler-Lagrange equations and the Hamiltonian formalism have been re-assessed in
this ... | 1706.09504v1 |
2017-07-06 | Relaxation time and critical slowing down of a spin-torque oscillator | The relaxation phenomena of spin-torque oscillators consisting of
nanostructured ferromagnets are interesting research targets in magnetism. A
theoretical study on the relaxation time of a spin-torque oscillator from one
self-oscillation state to another is investigated. By solving the
Landau-Lifshitz-Gilbert equation ... | 1707.01960v1 |
2017-07-07 | Pandeia: A Multi-mission Exposure Time Calculator for JWST and WFIRST | Pandeia is the exposure time calculator (ETC) system developed for the James
Webb Space Telescope (JWST) that will be used for creating JWST proposals. It
includes a simulation-hybrid Python engine that calculates the two-dimensional
pixel-by-pixel signal and noise properties of the JWST instruments. This allows
for ap... | 1707.02202v2 |
2017-07-10 | Convex optimization over classes of multiparticle entanglement | A well-known strategy to characterize multiparticle entanglement utilizes the
notion of stochastic local operations and classical communication (SLOCC), but
characterizing the resulting entanglement classes is difficult. Given a
multiparticle quantum state, we first show that Gilbert's algorithm can be
adapted to prove... | 1707.02958v3 |
2017-07-13 | Collective charge excitations and the metal-insulator transition in the square lattice Hubbard-Coulomb model | In this article, we discuss the non-trivial collective charge excitations
(plasmons) of the extended square-lattice Hubbard model. Using a fully
non-perturbative approach, we employ the hybrid Monte Carlo algorithm to
simulate the system at half-filling. A modified Backus-Gilbert method is
introduced to obtain the spec... | 1707.04212v2 |
2017-07-25 | Partially Ionized Plasmas in Astrophysics | Partially ionized plasmas are found across the Universe in many different
astrophysical environments. They constitute an essential ingredient of the
solar atmosphere, molecular clouds, planetary ionospheres and protoplanetary
disks, among other environments, and display a richness of physical effects
which are not pres... | 1707.07975v2 |
2017-07-14 | Spatially variant PSF modeling in confocal macroscopy | Point spread function (PSF) plays an essential role in image reconstruction.
In the context of confocal microscopy, optical performance degrades towards the
edge of the field of view as astigmatism, coma and vignetting. Thus, one should
expect the related artifacts to be even stronger in macroscopy, where the field
of ... | 1707.09858v1 |
2017-08-09 | Bubble Magnetometry of Nanoparticle Heterogeneity and Interaction | Bubbles have a rich history as transducers in particle-physics experiments.
In a solid-state analogue, we use bubble domains in nanomagnetic films to
measure magnetic nanoparticles. This technique can determine the magnetic
orientation of a single nanoparticle in a fraction of a second, and generate a
full hysteresis l... | 1708.02706v2 |
2017-08-18 | Antiferromagnetic nano-oscillator in external magnetic fields | We describe the dynamics of an antiferromagnetic nano-oscillator in an
external magnetic field of any given time distribution. The oscillator is
powered by a spin current originating from spin-orbit effects in a neighboring
heavy metal layer, and is capable of emitting a THz signal in the presence of
an additional easy... | 1708.05590v2 |
2017-09-07 | A sharp bound for winning within a proportion of the maximum of a sequence | This note considers a variation of the full-information secretary problem
where the random variables to be observed are independent and identically
distributed. Consider $X_1,\dots,X_n$ to be an independent sequence of random
variables, let $M_n:=\max\{X_1,\dots,X_n\}$, and the objective is to select the
maximum of the... | 1709.02416v1 |
2017-09-18 | Endo-VMFuseNet: Deep Visual-Magnetic Sensor Fusion Approach for Uncalibrated, Unsynchronized and Asymmetric Endoscopic Capsule Robot Localization Data | In the last decade, researchers and medical device companies have made major
advances towards transforming passive capsule endoscopes into active medical
robots. One of the major challenges is to endow capsule robots with accurate
perception of the environment inside the human body, which will provide
necessary informa... | 1709.06041v2 |
2017-09-22 | On self-dual negacirculant codes of index two and four | In this paper, we study a special kind of factorization of $x^n+1$ over
$\mathbb{F}_q, $ with $q$ a prime power $\equiv 3~({\rm mod}~4)$ when $n=2p,$
with $p\equiv 3~({\rm mod}~4)$ and $p$ is a prime. Given such a $q$ infinitely
many such $p$'s exist that admit $q$ as a primitive root by the Artin
conjecture in arithme... | 1709.07546v2 |
2017-03-06 | Ultra-Low-Energy Straintronics Using Multiferroic Composites | The primary impediment to continued improvement of charge-based electronics
is the excessive energy dissipation incurred in switching a bit of information.
With suitable choice of materials, devices made of multiferroic composites,
i.e., strain-coupled piezoelectric-magnetostrictive heterostructures, dissipate
miniscul... | 1710.00612v1 |
2017-10-12 | Modeling the aging kinetics of zirconia ceramics | Yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) with different
microstructures were elaborated. The isothermal tetragonal to monoclinic
transformation was investigated at 134 {\deg}C in steam by X-ray diffraction,
Atomic Force Microscopy (AFM) and optical interferometry. The aging kinetics
were analyzed in ... | 1710.04454v1 |
2017-10-13 | Microstructural investigation of the aging behavior of $(3Y-TZP)-Al_2O_3$ composites | The low temperature autoclave aging behavior of zirconia toughened alumina
composites processed by a classical powder mixing processing route was analyzed
using atomic force microscopy (AFM), scanning electron microscopy and X-Ray
diffraction. The transformation was evaluated in terms of nucleation and
growth, assessed... | 1710.04923v1 |
2017-10-16 | Tunable Low Density Palladium Nanowire Foams | Nanostructured palladium foams offer exciting potential for applications in
diverse fields such as catalyst, fuel cell, and particularly hydrogen storage
technologies. We have fabricated palladium nanowire foams using a cross-linking
and freeze-drying technique. These foams have a tunable density down to 0.1% of
the bu... | 1710.05906v1 |
2017-10-19 | An estimate for the thermal photon rate from lattice QCD | We estimate the production rate of photons by the quark-gluon plasma in
lattice QCD. We propose a new correlation function which provides better
control over the systematic uncertainty in estimating the photon production
rate at photon momenta in the range {\pi}T/2 to 2{\pi}T. The relevant Euclidean
vector current corr... | 1710.07050v1 |
2017-10-26 | Spin dynamics in MgO based magnetic tunnel junctions with dynamical exchange coupling | We study the spin dynamics in Fe|MgO|Fe tunnel junction with the dynamical
exchange coupling by coupled Landau-Lifshitz-Gilbert equations. The effects of
spin pumping on the spin dynamics are investigated in detail. It is observed
that the spin pumping can stabilize a quasi-antiparallel state rather than a
quasi-parall... | 1710.09666v2 |
2017-10-27 | Bulk and edge spin transport in topological magnon insulators | We investigate the spin transport properties of a topological magnon
insulator, a magnetic insulator characterized by topologically nontrivial bulk
magnon bands and protected magnon edge modes located in the bulk band gaps.
Employing the Landau-Lifshitz-Gilbert phenomenology, we calculate the spin
current driven throug... | 1710.09998v2 |
2017-10-30 | Spin-transfer Antiferromagnetic Resonance | Currents can induce spin excitations in antiferromagnets, even when they are
insulating. We investigate how spin transfer can cause antiferromagnetic
resonance in bilayers and trilayers that consist of one antiferromagnetic
insulator and one or two metals. An ac voltage applied to the metal generates a
spin Hall curren... | 1710.10909v1 |
2017-10-31 | Compact Multi-Class Boosted Trees | Gradient boosted decision trees are a popular machine learning technique, in
part because of their ability to give good accuracy with small models. We
describe two extensions to the standard tree boosting algorithm designed to
increase this advantage. The first improvement extends the boosting formalism
from scalar-val... | 1710.11547v1 |
2017-11-14 | Stationary Vacuum Black Holes in 5 Dimensions | We study the problem of asymptotically flat bi-axially symmetric stationary
solutions of the vacuum Einstein equations in $5$-dimensional spacetime. In
this setting, the cross section of any connected component of the event horizon
is a prime $3$-manifold of positive Yamabe type, namely the $3$-sphere $S^3$,
the ring $... | 1711.05229v2 |
2017-11-27 | Voltage induced switching of an antiferromagnetically ordered topological Dirac semimetal | An antiferromagnetic semimetal has been recently identified as a new member
of topological semimetals that may host three-dimensional symmetry-protected
Dirac fermions. A reorientation of the N\'{e}el vector may break the underlying
symmetry and open a gap in the quasi-particle spectrum, inducing the
(semi)metal-insula... | 1711.09926v2 |
2017-12-11 | Convergent tangent plane integrators for the simulation of chiral magnetic skyrmion dynamics | We consider the numerical approximation of the Landau-Lifshitz-Gilbert
equation, which describes the dynamics of the magnetization in ferromagnetic
materials. In addition to the classical micromagnetic contributions, the energy
comprises the Dzyaloshinskii-Moriya interaction, which is the most important
ingredient for ... | 1712.03795v3 |
2017-12-31 | Proper dissipative torques in antiferromagnetic dynamics | There is little doubt that the magnetization dynamics of ferromagnetic
systems is governed by the Landau-Lifshitz-Gilbert equation or its
generalization with various spin torques. In contrast, there are several sets
of dynamic equations for two-sublattice antiferromagnets (AFMs) in literature
that have different forms ... | 1801.00217v1 |
2018-01-12 | Optimal Streaming Codes for Channels with Burst and Arbitrary Erasures | This paper considers transmitting a sequence of messages (a streaming source)
over a packet erasure channel. In each time slot, the source constructs a
packet based on the current and the previous messages and transmits the packet,
which may be erased when the packet travels from the source to the destination.
Every so... | 1801.04241v2 |
2018-01-16 | Detecting Electron Density Fluctuations from Cosmic Microwave Background Polarization using a Bispectrum Approach | Recent progress in high sensitivity Cosmic Microwave Background (CMB)
polarization experiments opens up a window on large scale structure (LSS), as
CMB polarization fluctuations on small angular scales can arise from a
combination of LSS and ionization fluctuations in the late universe.
Gravitational lensing effects ca... | 1801.05396v1 |
2018-01-18 | Magpy: A C++ accelerated Python package for simulating magnetic nanoparticle stochastic dynamics | Magpy is a C++ accelerated Python package for modelling and simulating the
magnetic dynamics of nano-sized particles. Nanoparticles are modelled as a
system of three-dimensional macrospins and simulated with a set of coupled
stochastic differential equations (the Landau-Lifshitz-Gilbert equation), which
are solved nume... | 1801.06073v2 |
2018-01-22 | On the List Decodability of Self-orthogonal Rank Metric Codes | V. Guruswami and N. Resch prove that the list decodability of
$\mathbb{F}_q$-linear rank metric codes is as good as that of random rank
metric codes in~\cite{venkat2017}. Due to the potential applications of
self-orthogonal rank metric codes, we focus on list decoding of them. In this
paper, we prove that with high pro... | 1801.07033v1 |
2018-01-25 | Smoothing Algorithms for Computing the Projection onto a Minkowski Sum of Convex Sets | In this paper, the problem of computing the projection, and therefore the
minimum distance, from a point onto a Minkowski sum of general convex sets is
studied. Our approach is based on the minimum norm duality theorem originally
stated by Nirenberg and the Nesterov smoothing techniques. It is shown that
projection poi... | 1801.08285v1 |
2018-01-25 | Finite momentum Cooper pairing in 3D topological insulator Josephson junctions | Unconventional superconductivity arising from the interplay between strong
spin-orbit coupling and magnetism is an intensive area of research. One form of
unconventional superconductivity arises when Cooper pairs subjected to a
magnetic exchange coupling acquire a finite momentum. Here, we report on a
signature of fini... | 1801.08504v1 |
2018-01-31 | Numerical analytic continuation of Euclidean data | In this work we present a direct comparison of three different numerical
analytic continuation methods: the Maximum Entropy Method, the Backus-Gilbert
method and the Schlessinger point or Resonances Via Pad\'{e} method. First, we
perform a benchmark test based on a model spectral function and study the
regime of applic... | 1801.10348v2 |
2018-02-03 | Stochastic dynamics of planar magnetic moments in a three-dimensional environment | We study the stochastic dynamics of a two-dimensional magnetic moment
embedded in a three-dimensional environment, described by means of the
stochastic Landau-Lifshitz-Gilbert (sLLG) equation. We define a covariant
generalization of this equation, valid in the "generalized Stratonovich
discretization prescription". We ... | 1802.01027v2 |
2018-02-07 | Asymptotically Locally Euclidean/Kaluza-Klein Stationary Vacuum Black Holes in 5 Dimensions | We produce new examples, both explicit and analytical, of bi-axisymmetric
stationary vacuum black holes in 5 dimensions. A novel feature of these
solutions is that they are asymptotically locally Euclidean in which spatial
cross-sections at infinity have lens space $L(p,q)$ topology, or asymptotically
Kaluza-Klein so t... | 1802.02457v2 |
2018-02-16 | A Reallocation Algorithm for Online Split Packing of Circles | The Split Packing algorithm \cite{splitpacking_ws, splitpackingsoda,
splitpacking} is an offline algorithm that packs a set of circles into
triangles and squares up to critical density. In this paper, we develop an
online alternative to Split Packing to handle an online sequence of insertions
and deletions, where the a... | 1802.05873v3 |
2018-02-22 | Super-Resolution 1H Magnetic Resonance Spectroscopic Imaging utilizing Deep Learning | Magnetic resonance spectroscopic imaging (SI) is a unique imaging technique
that provides biochemical information from in vivo tissues. The 1H spectra
acquired from several spatial regions are quantified to yield metabolite
concentrations reflective of tissue metabolism. However, since these
metabolites are found in ti... | 1802.07909v3 |
2018-02-26 | Devil's Staircases in SFS Josephson Junctions | We study the effect of coupling between the superconducting current and
magnetization in the superconductor/ferromagnet/superconductor Josephson
junction under an applied circularly polarized magnetic field. Manifestation of
ferromagnetic resonance in the frequency dependence of the amplitude of the
magnetization and t... | 1802.09212v2 |
2018-02-26 | Controlled creation and stability of kπ-skyrmions on a discrete lattice | We determine sizes and activation energies of k{\pi}-skyrmions on a discrete
lattice using the Landau- Lifshitz-Gilbert equation and the geodesic nudged
elastic band method. The employed atomic material parameters are based on the
skyrmionic material system Pd/Fe/Ir(111). We find that the critical magnetic
fields for c... | 1802.09257v1 |
2018-03-14 | Subnanosecond magnetization reversal of magnetic nanoparticle driven by chirp microwave field pulse | We investigate the magnetization reversal of single-domain magnetic
nanoparticle driven by linear down-chirp microwave magnetic field pulse.
Numerical simulations based on the Landau-Lifshitz-Gilbert equation reveal that
solely down-chirp pulse is capable of inducing subnanosecond magnetization
reversal. With a certain... | 1803.05261v1 |
2018-03-14 | Dynamics of distorted skyrmions in strained chiral magnets | In this work, we study the microscopic dynamics of distorted skyrmions in
strained chiral magnets [K. Shibata et al., Nat. Nanotech. 10, 589 (2015)]
under gradient magnetic field or electric current by Landau-Lifshitz-Gilbert
simulations of the anisotropic spin model. It is observed that the dynamical
responses are als... | 1803.05298v1 |
2018-03-19 | Dynamics and Stability of Meshed Multiterminal HVDC Networks | This paper investigates the existence of an equilibrium point in
multiterminal HVDC (MT-HVDC) grids, assesses its uniqueness and defines
conditions to ensure its stability. An offshore MT-HVDC system including two
wind farms is selected as application test case. At first, a generalized
dynamic model of the network is p... | 1803.06892v2 |
2018-03-16 | Motion of vortices in ferromagnetic spin-1 BEC | The paper investigates dynamics of nonsingular vortices in a ferromagnetic
spin-1 BEC, where spin and mass superfluidity coexist in the presence of
uniaxial anisotropy (linear and quadratic Zeeman effect). The analysis is based
on hydrodynamics following from the Gross-Pitaevskii theory. Cores of
nonsingular vortices a... | 1803.06939v1 |
2018-03-22 | Mapping ideals of quantum group multipliers | We study the dual relationship between quantum group convolution maps
$L^1(\mathbb{G})\rightarrow L^{\infty}(\mathbb{G})$ and completely bounded
multipliers of $\widehat{\mathbb{G}}$. For a large class of locally compact
quantum groups $\mathbb{G}$ we completely isomorphically identify the mapping
ideal of row Hilbert ... | 1803.08342v2 |
2018-03-28 | Low-temperature ageing of zirconia-toughened alumina ceramics and its implication in biomedical implants | Changes in crystalline phases resulting from low-temperature ageing of
different yttria doped and non-doped zirconia-toughened alumina composites and
nanocomposites were investigated under controlled humidity and temperature
conditions in autoclave. A classical powder mixing processing route and a new
modified colloida... | 1803.10465v1 |
2018-03-28 | Accelerated Aging in 3 mol%-Yttria-Stabilized Tetragonal Zirconia Ceramics Sintered in Reducing Conditions | The aging behavior of 3-mol%-yttria-stabilized tetragonal zirconia (3Y-TZP)
ceramics sintered in air and in reducing conditions was investigated at
140{\deg}C in water vapor. It was observed by X-ray diffraction (XRD) that
3Y-TZP samples sintered in reducing conditions exhibited significantly higher
tetragonal-to-monoc... | 1803.10580v1 |
2018-03-30 | Atomic force microscopy study of the surface degradation mechanisms of zirconia based ceramics | Atomic force microscopy (AFM) can be used to characterise several aspects of
the surface degradation and reinforcement mechanisms of zirconia based
ceramics, such as crack propagation, martensitic relief formation, grains
pull-out and transformation toughening. AFM can also be used to quantify
precisely the transformat... | 1804.00002v1 |
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