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Stability of the decagonal quasicrystal in the Lennard-Jones-Gauss
system: Although quasicrystals have been studied for 25 years, there are many open
questions concerning their stability: What is the role of phason fluctuations?
Do quasicrystals transform into periodic crystals at low temperature? If yes,
by what mec... | cond-mat_other |
Study of superfluid $^3$He under nanoscale confinement. A new approach
to the investigation of superfluid $^3$He films: We review recent experiments in which superfluid $^3$He has been studied
under highly controlled confinement in nanofluidic sample chambers. We discuss
the experimental challenges and their resoluti... | cond-mat_other |
Creating stable molecular condensate using a generalized Raman adiabatic
passage scheme: We study the Feshbach resonance assisted stimulated adiabatic passage of an
effective coupling field for creating stable molecules from atomic Bose
condensate. By exploring the properties of the coherent population trapping
state... | cond-mat_other |
Finite Temperature Dynamics of Spin Solitons with Applications in
Thermocouples and Refrigerators: The exploitation of spin Berry phases to generate emergent fields for
producing miniaturized and high-quality inductors has enjoyed considerable
popularity among proponents of quantum technologies [Nature 586, 202 (2020... | cond-mat_other |
Superfluid shells for trapped fermions with mass and population
imbalance: We map out the phase diagram of strongly interacting fermions in a potential
trap with mass and population imbalance between the two spin components. As a
unique feature distinctively different from the equal-mass case, we show that
the superf... | cond-mat_other |
Symbiotic Solitons in Heteronuclear Multicomponent Bose-Einstein
condensates: We show that bright solitons exist in quasi-one dimensional heteronuclear
multicomponent Bose-Einstein condensates with repulsive self-interaction and
attractive inter-species interaction. They are remarkably robust to
perturbations of init... | cond-mat_other |
Virial theorems for trapped cold atoms: We present a general virial theorem for quantum particles with arbitrary
zero-range or finite-range interactions in an arbitrary external potential. We
deduce virial theorems for several situations relevant to trapped cold atoms:
zero-range interactions with and without Efimov ef... | cond-mat_other |
Effect of fluctuations on the superfluid-supersolid phase transition on
the lattice: We derive a controlled expansion into mean field plus fluctuations for the
extended Bose-Hubbard model, involving interactions with many neighbors on an
arbitrary periodic lattice, and study the superfluid-supersolid phase
transition... | cond-mat_other |
Probing the intrinsic state of a one-dimensional quantum well with a
photon-assisted tunneling: The photon-assisted tunneling (PAT) through a single wall carbon nanotube
quantum well (QW) under influence an external electromagnetic field for probing
of the Tomonaga Luttinger liquid (TLL) state is suggested. The eleme... | cond-mat_other |
Ultracold atoms confined in an optical lattice plus parabolic potential:
a closed-form approach: We discuss interacting and non-interacting one dimensional atomic systems
trapped in an optical lattice plus a parabolic potential. We show that, in the
tight-binding approximation, the non-interacting problem is exactly ... | cond-mat_other |
Full counting statistics of heteronuclear molecules from
Feshbach-assisted photo association: We study the effects of quantum statistics on the counting statistics of
ultracold heteronuclear molecules formed by Feshbach-assisted photoassociation
[Phys. Rev. Lett. {\bf 93}, 140405 (2004)]. Exploiting the formal simila... | cond-mat_other |
Electric power transfer in spin pumping experiments: Spin pumping is becoming an established method to generate voltages from
magnetic dynamics. The standard detection method of spin pumping is based on
open circuit voltage measurement across ferromagnetic (FM) and non-magnetic
(NM) bi-layers, where the inverse spin-Ha... | cond-mat_other |
The absence of fragmentation in Bose-Einstein condensates: A Bose-Einstein condensate produced by a Hamiltonian which is rotationally or
translationally symmetric is fragmented as a direct result of these symmetries.
A corresponding mean-field unfragmented state, with an identical energy to
leading order in the number ... | cond-mat_other |
Possible experiment for determination of the role of microscopic vortex
rings in the λ-transition in He-II: It is suggested that microscopic vortex rings (MVR) play an important role in
the \lambda-transition in helium-II and substantially determine the value of
T_{\lambda}. For very thin films of He-II, with thickne... | cond-mat_other |
Phase diagram for a Bose-Einstein condensate moving in an optical
lattice: The stability of superfluid currents in a system of ultracold bosons was
studied using a moving optical lattice. Superfluid currents in a very weak
lattice become unstable when their momentum exceeds 0.5 recoil momentum.
Superfluidity vanishes... | cond-mat_other |
Endurance Write Speed Tradeoffs in Nonvolatile Memories: We derive phenomenological model for endurance-write time switching tradeoff
for nonvolatile memories with thermally activated switching mechanisms. The
model predicts linear to cubic dependence of endurance on write time for metal
oxide memristors and flash memo... | cond-mat_other |
A Tonks Giradeau Gas in the Presence of a Local Potential: The physics of a Tonks-Giradeau Gas in the presence of a local potential is
studied. In order to evaluate the single particle density matrix (SPDM) of the
many-body ground state, the Wiger-Jordan transformation is used. The
eigenvector with the largest eigenval... | cond-mat_other |
Topologically trapped vortex molecules in Bose-Einstein condensates: In a numerical experiment based on Gross-Pitaevskii formalism, we demonstrate
unique topological quantum coherence in optically trapped Bose-Einstein
condensates (BECs). Exploring the fact that vortices in rotating BEC can be
pinned by a geometric arr... | cond-mat_other |
Equation of state of cubic boron nitride at high pressures and
temperatures: We report accurate measurements of the equation of state (EOS) of cubic boron
nitride by x-ray diffraction up to 160 GPa at 295 K and 80 GPa in the range
500-900 K. Experiments were performed on single-crystals embedded in a
quasi-hydrostati... | cond-mat_other |
The Plastic Flow of Solid 4He through a Porous Membrane: The flow velocity of solid 4He through a porous membrane frozen into a
crystal has been measured in the temperature interval 0.1 - 1.8 K. A flat
capacitor consisting of a metalized plastic porous membrane and a bulk
electrode is applied and the gap in the capacit... | cond-mat_other |
Dynamics of matter-wave and optical fields in superradiant scattering
from Bose-Einstein condensates: We study superradiant scattering off Bose-Einstein condensates by solving the
semiclassical Maxwell-Schroedinger equations describing the coupled dynamics of
matter-wave and optical fields. Taking the spatial depende... | cond-mat_other |
Long-range correlation energies and off-diagonal interactions for the
$π$ electronic systems: The long-range correlation energies and the off-diagonal interactions are
studied and a general formula for correlation energy $E_c$ of the $\pi$
electron systems is given, which is beyond the nearest-neighbor
electron-elect... | cond-mat_other |
Critical temperature of a trapped Bose gas: comparison of theory and
experiment: We apply the Projected Gross-Pitaevskii equation (PGPE) formalism to the
experimental problem of the shift in critical temperature $T_c$ of a
harmonically confined Bose gas as reported in Gerbier \emph{et al.} [Phys. Rev.
Lett. \textbf{9... | cond-mat_other |
Low-energy effective theory of the toric code model in a parallel field: We determine analytically the phase diagram of the toric code model in a
parallel magnetic field which displays three distinct regions. Our study relies
on two high-order perturbative expansions in the strong- and weak-field limit,
as well as a la... | cond-mat_other |
Estimation of the spatial decoherence time in circular quantum dots: We propose a simple phenomenological model to estimate the spatial
decoherence time in quantum dots. The dissipative phase space dynamics is
described in terms of the density matrix and the corresponding Wigner function,
which are derived from a maste... | cond-mat_other |
The Linear and Non-linear Magnetic Response of a Tri-Uranium Single
Molecule Magnet: We report here low temperature magnetization isotherms for the single
molecule magnet, $(UO_2-L)_3$. By analyzing the low temperature magnetization
in terms of $M= X_1*B + X_3*B^3$ we extract the linear susceptibility $X_1$ and
the l... | cond-mat_other |
Adiabatic Transport of Bose-Einstein Condensate in Double- and
Triple-Well Traps: By using a close similarity between multi-photon and tunneling population
transfer schemes, we propose robust adiabatic methods for the transport of
Bose-Einstein condensate (BEC) in double- and triple-well traps. The
calculations withi... | cond-mat_other |
Applying matrix product operators to model systems with long-range
interactions: An algorithm is presented which computes a translationally invariant matrix
product state approximation of the ground state of an infinite 1D system; it
does this by embedding sites into an approximation of the infinite
``environment'' o... | cond-mat_other |
S-mixing and quantum tunneling of the magnetization in molecular
nanomagnets: The role of $S$-mixing in the quantum tunneling of the magnetization in
nanomagnets has been investigated. We show that the effect on the tunneling
frequency is huge and that the discrepancy (more than 3 orders of magnitude in
the tunneling... | cond-mat_other |
Electron sound in metals: This paper is devoted to the investigation of electron sound -- oscillations
of the electron distribution function coupled with elastic deformation and
propagating with the Fermi velocity. The amplitude-phase relations
characterizing the behavior of the electron sound in Ga single crystals are... | cond-mat_other |
Full transmission through perfect-conductor subwavelength hole arrays: Light transmission through 2D subwavelength hole arrays in perfect-conductor
films is shown to be complete (100%) at some resonant wavelengths even for
arbitrarily narrow holes. Conversely, the reflection on a 2D planar array of
non-absorbing scatte... | cond-mat_other |
Entanglement and errors in the control of spins by optical coupling: We analyze the optical quantum control of impurity spins in proximity to a
quantum dot. A laser pulse creates an exciton in the dot and controls the spins
by indirect coupling. We show how to determine the control parameters using as
an illustration t... | cond-mat_other |
Photoinduced vibronic coupling in two-level dissipative systems: Interaction of an electron system with a strong electromagnetic wave leads to
rearrangement both the electron and vibrational energy spectra of a dissipative
system. For instance, the optically coupled electron levels become split in the
conditions of the... | cond-mat_other |
Continuum Mechanics for Quantum Many-Body Systems: The Linear Response
Regime: We derive a closed equation of motion for the current density of an
inhomogeneous quantum many-body system under the assumption that the
time-dependent wave function can be described as a geometric deformation of the
ground-state wave func... | cond-mat_other |
Evolution of Electronic and Vibrational Polarity of NaF Nanocrystals
from Diatomic to Bulk: A Density Functional Study: Density functional theory (DFT) is used to study vibrations, electrical
dipole moments, and polarizabilities of NaF clusters. Because of prior
experimental and theoretical studies, this is a good mo... | cond-mat_other |
On non-markovian nature of stock trading: Using a relationship between the moments of the probability distribution of
times between the two consecutive trades (intertrade time distribution) and the
moments of the distribution of a daily number of trades we show, that the
underlying point process generating times of the... | cond-mat_other |
Manifolds of quasi-constant SOAP and ACSF fingerprints and the resulting
failure to machine learn four-body interactions: Atomic fingerprints are commonly used for the characterization of local
environments of atoms in machine learning and other contexts. In this work, we
study the behavior of two widely used fingerp... | cond-mat_other |
Possible display of phason mode of electromagnons in TbMnO3: The interaction of light in terahertz frequency region with electromagnons in
a sinusoidal incommensurate magnetic state in TbMnO3 is studied. A significant
change in the frequency dependence of the dielectric constant e_zz near the
temperature of the phase t... | cond-mat_other |
Dynamical Instability of a Doubly Quantized Vortex in a Bose-Einstein
condensate: Doubly quantized vortices were topologically imprinted in $|F=1>$ $^{23}$Na
condensates, and their time evolution was observed using a tomographic imaging
technique. The decay into two singly quantized vortices was characterized and
att... | cond-mat_other |
Stability and excitations of solitons in 2D Bose-Einstein condensates: The small oscillations of solitons in 2D Bose-Einstein condensates are
investigated by solving the Kadomtsev-Petviashvili equation which is valid when
the velocity of the soliton approaches the speed of sound. We show that the
soliton is stable and ... | cond-mat_other |
Sandpiles and superconductors: dual variational formulations for
critical-state problems: Similar evolutionary variational inequalities appear as convenient
formulations for continuous models for sandpile growth, magnetization of
type-II superconductors, and evolution of some other dissipative systems
characterized b... | cond-mat_other |
Discontinuities in fourth sound waves in superfluid helium: Formation of fourth-sound shock waves in narrow channels filled with
superfluid helium is studied. Physical and mathematical conditions at the
surface of discontinuity are established. These conditions differ somewhat from
those in case of first- and second-so... | cond-mat_other |
Inhibition of Transport of a Bose-Einstein Condensate in a Random
Potential: We observe the suppression of the 1D transport of an interacting elongated
Bose-Einstein condensate in a random potential with a standard deviation small
compared to the typical energy per atom, dominated by the interaction energy.
Numerical... | cond-mat_other |
Aging in Citation Networks: In many growing networks, the age of the nodes plays an important role in
deciding the attachment probability of the incoming nodes. For example, in a
citation network, very old papers are seldom cited while recent papers are
usually cited with high frequency. We study actual citation networ... | cond-mat_other |
Tunneling in a uniform one-dimensional superfluid: emergence of a
complex instanton: In a uniform ring-shaped one-dimensional superfluid, quantum fluctuations
that unwind the order parameter need to transfer momentum to quasiparticles
(phonons). We present a detailed calculation of the leading exponential factor
gove... | cond-mat_other |
Electron guiding through insulating nanocapillaries: We simulate the electron transmission through insulating Mylar (PET)
capillaries. We show that the mechanisms underlying the recently discovered
electron guiding are fundamentally different from those for ion guiding.
Quantum reflection and multiple near-forward scat... | cond-mat_other |
Special relativity description of the heat propagation in Minkowski
spacetime: In this paper we investigate the heat transport induced by continuous laser
beams up to an intensity of about 1029 Watt/cm2. We maintain that up to this
intensity nonlinear effects are negligible and that the application of the
linear hype... | cond-mat_other |
Rare-earth solid-state qubits: Quantum bits (qubits) are the basic building blocks of any quantum computer.
Superconducting qubits have been created with a 'top-down' approach that
integrates superconducting devices into macroscopic electrical circuits [1-3],
whereas electron-spin qubits have been demonstrated in quant... | cond-mat_other |
Stability of the decagonal quasicrystal in the Lennard-Jones-Gauss
system: Although quasicrystals have been studied for 25 years, there are many open
questions concerning their stability: What is the role of phason fluctuations?
Do quasicrystals transform into periodic crystals at low temperature? If yes,
by what mec... | cond-mat_other |
Resonantly enhanced tunneling of Bose-Einstein condensates in periodic
potentials: We report on measurements of resonantly enhanced tunneling of Bose-Einstein
condensates loaded into an optical lattice. By controlling the initial
conditions of our system we were able to observe resonant tunneling in the
ground and th... | cond-mat_other |
Laser tweezers for atomic solitons: We describe a controllable and precise laser tweezers for Bose-Einstein
condensates of ultracold atomic gases. In our configuration, a laser beam is
used to locally modify the sign of the scattering length in the vicinity of a
trapped BEC. The induced attractive interactions between ... | cond-mat_other |
Relaxation and decoherence in a resonantly driven qubit: Relaxation and decoherence of a qubit coupled to environment and driven by a
resonant ac field are investigated by analytically solving Bloch equation of
the qubit. It is found that the decoherence of a driven qubit can be decomposed
into intrinsic and field-depe... | cond-mat_other |
A Semiclassical Model for Molecular Localization in Ammonia: The pedagogic two stste system of the ammonia molecule is used to illustrate
the phenomenon of environment induced molecular localization in pyramidal
molecules. A semiclassical model is used to describe a gas of pyramidal
molecules interacting via hard ball ... | cond-mat_other |
Resonant control of spin dynamics in ultracold quantum gases by
microwave dressing: We study experimentally interaction-driven spin oscillations in optical
lattices in the presence of an off-resonant microwave field. We show that the
energy shift induced by this microwave field can be used to control the spin
oscilla... | cond-mat_other |
The role of Helium-3 impurities in the stress induced roughening of
superclimbing dislocations in solid Helium-4: We analyze the stress induced and thermally assisted roughening of a forest
of superclimbing dislocations in a Peierls potential in the presence of
Helium-3 impurities and randomly frozen in static stress... | cond-mat_other |
Formulas and equations for finding scattering data from the
Dirichlet-to-Neumann map with nonzero background potential: For the Schrodinger equation at fixed energy with a potential supported in a
bounded domain we give formulas and equations for finding scattering data from
the Dirichlet-to-Neumann map with nonzero ... | cond-mat_other |
Breakdown of Potential Flow to Turbulence around a Sphere Oscillating in
Superfluid He-4 above the Critical Velocity: The onset of turbulent flow around an oscillating sphere in superfluid $^4$He
is known to occur at a critical velocity $v_c \sim \sqrt{\kappa\omega}$ where
$\kappa$ is the circulation quantum and $\om... | cond-mat_other |
Quantum liquid of repulsively bound pairs of particles in a lattice: Repulsively interacting particles in a periodic potential can form bound
composite objects, whose dissociation is suppressed by a band gap. Nearly pure
samples of such repulsively bound pairs of cold atoms -- "dimers" -- have
recently been prepared by... | cond-mat_other |
Coherent adiabatic theory of two-electron quantum dot molecules in
external spin baths: We derive an accurate molecular orbital based expression for the coherent
time evolution of a two-electron wave function in a quantum dot molecule where
the electrons interact with each other, with external time dependent
electrom... | cond-mat_other |
The density maximum of He4 at the lambda point modeled by the stochastic
quantum hydrodynamic analogy: The lambda point in liquid He4 is a well established phenomenon acknowledged
as an example of Bose-Einstain condensation. This is generally accepted, but
there are serious discrepancies between the theory and experi... | cond-mat_other |
Pseudospin excitations in coaxial nanotubes: In a 2DEG confined to two coaxial tubes the `tube degree of freedom' can be
described in terms of pseudospin-1/2 dynamics. The presence of tunneling
between the two tubes leads to a collective oscillation known as pseudospin
resonance. We employ perturbation theory to examin... | cond-mat_other |
Superfluid hydrodynamics in fractal dimension space: The complex behavior of liquid ${}^4$He and liquid ${}^3$He in nanoporous
media is determined by influence of randomly distributed geometrical
confinement as well as by significant contribution from the atoms near walls.
In the present paper fractional Schrodinger eq... | cond-mat_other |
The scaling of the density of states in systems with resonance states: Resonance states of a two-electron quantum dot are studied using a
variational expansion with both real basis-set functions and complex scaling
methods. We present numerical evidence about the critical behavior of the
density of states in the region... | cond-mat_other |
Luttinger parameter of quasi-one-dimensional para-H2: We have studied the ground-state properties of para-hydrogen in one dimension
and in quasi-one-dimensional configurations using the path integral ground
state Monte Carlo method. This method produces zero-temperature exact results
for a given interaction and geometr... | cond-mat_other |
On the Laser Stimulation of Low-Energy Nuclear Reactions in Deuterated
Palladium: Models to account for the observed experimental results for low-energy
nuclear reactions in palladium-deuteride systems are presented along with
calculated results. The crucial idea is a mechanism of improved probability for
the needed ... | cond-mat_other |
Coherent optical control of spin-spin interaction in doped
semiconductors: We provide a theory of laser-induced interaction between spins localized by
impurity centers in a semiconductor host. By solving exactly the problem of two
localized spins interacting with one itinerant exciton, an analytical
expression for th... | cond-mat_other |
Detection of vortex coherent structures in superfluid turbulence: Filamentary regions of high vorticity irregularly form and disappear in the
turbulent flows of classical fluids. We report an experimental comparative
study of these so-called " coherent structures " in a classical versus quantum
fluid, using liquid heli... | cond-mat_other |
Correlation functions of cold bosons in an optical lattice: We investigate the experiment of collapses and revivals of matter wave field
in more detail. To this end we calculate the lowest-order correlation functions
of the Bose field. We compare predictions of the total Fock state with the
commonly used coherent state... | cond-mat_other |
Li Doping Effect on Properties and Phase Transfomations of Knbo3: Dielectric permittivity and infrared reflectivity spectra of Li doped KNbO3
single crystals have been studied for the first time for K1-xLixNbO3 (KLN) with
x = 0.015, 0.02, 0.065. It was found that like in KTaO3, Li admixture results
in appearance of die... | cond-mat_other |
Vortices in Bose-Einstein Condensates: Some Recent Developments: In this brief review we summarize a number of recent developments in the
study of vortices in Bose-Einstein condensates, a topic of considerable
theoretical and experimental interest in the past few years. We examine the
generation of vortices by means of... | cond-mat_other |
Photon recycling in Fabry-Perot micro-cavities based on Si$_3$N$_4$
waveguides: We present a numerical analysis and preliminary experimental results on
one-dimensional Fabry-Perot micro-cavities in Si$_3$N$_4$ waveguides. The
Fabry-Perot micro-cavities are formed by two distributed Bragg reflectors
separated by a str... | cond-mat_other |
Theoretical Studies on the Scanning Tunneling Microscope: The thesis explores calculating tunneling current densities between planar
conducting electrodes in an STM. It considers factors like bias voltages and
the separation between electrodes, using Fermi energy and work functions. Pauli
blocking effects on forward an... | cond-mat_other |
Large scale numerical simulations of "ultrametric" long-range depinning: The depinning of an elastic line interacting with a quenched disorder is
studied for long range interactions, applicable to crack propagation or
wetting. An ultrametric distance is introduced instead of the Euclidean
distance, allowing for a drast... | cond-mat_other |
Semiclassical and quantum polarons in crystaline acetanilide: Crystalline acetanilide is a an organic solid with peptide bond structure
similar to that of proteins. Two states appear in the amide I spectral region
having drastically different properties: one is strongly temperature dependent
and disappears at high temp... | cond-mat_other |
Bose-Einstein condensates of polar molecules: anisotropic interactions =
anisotropic mass: So far the theory of Bose-Einstein condensates (BEC) of polar molecules was
based on an ad hoc generalization of equations for spherical atoms. Here I
adopt a rigorous pseudo-potential approach to low-energy dipolar interaction... | cond-mat_other |
Bright solitary waves of atomic Bose-Einstein condensates under rotation: We analyse the rotation of bright solitary waves formed of atomic
Bose-Einstein condensates with attractive atomic interactions. By employing a
variational technique and assuming an irrotational quadrupolar flow field, we
map out the variational ... | cond-mat_other |
Reaction Enhanced Diffusion in Spherical Membranes: The reversible reactions like A+B <-> C in the many-component diffusive
system affect the diffusive properties of the constituents. The effective
conjugation of irreversible processes of different dimensionality takes place
due to the stationarity in the system and ca... | cond-mat_other |
Levels of self-consistency in the GW approximation: We perform $GW$ calculations on atoms and diatomic molecules at different
levels of self-consistency and investigate the effects of self-consistency on
total energies, ionization potentials and on particle number conservation. We
further propose a partially self-consi... | cond-mat_other |
Magnetization dynamics in dysprosium orthoferrites via inverse Faraday
effect: The ultrafast non-thermal control of magnetization has recently become
feasible in canted antiferromagnets through photomagnetic instantaneous pulses
[A.V. Kimel {\it et al.}, Nature {\bf 435}, 655 (2005)]. In this experiment
circularly po... | cond-mat_other |
Financial heat machine: We consider dynamics of financial markets as dynamics of expectations and
discuss such a dynamics from the point of view of phenomenological
thermodynamics. We describe a financial Carnot cycle and the financial analogue
of a heat machine. We see, that while in physics a perpetuum mobile is
abso... | cond-mat_other |
Ultrasensitive nanoelectromechanical mass detection: We describe the application of nanoelectromechanical systems (NEMS) to
ultrasensitive mass detection. In these experiments, a modulated flux of atoms
was adsorbed upon the surface of a 32.8 MHz NEMS resonator within an ultrahigh
vacuum environment. The mass-induced r... | cond-mat_other |
Topological Constraints on the Charge Distributions for the Thomson
Problem: The method of Morse theory is used to analyze the distributions of unit
charges interacting through a repulsive force and constrained to move on the
surface of a sphere -- the Thomson problem. We find that, due to topological
reasons, the sy... | cond-mat_other |
Comment on the paper "Quasi-particle approach for lattice Hamiltonians
with large coordination numbers" by P. Navez, F. Queisser and R. Schützhold
- J. Phys. A: Math. Theor. 47 225004 (2014): This comment regards a central aspect of the referred-to paper, the issue of
convergence of the large coordination-number ex... | cond-mat_other |
A Guided Walk Down Wall Street: an Introduction to Econophysics: This article contains the lecture notes for the short course ``Introduction
to Econophysics,'' delivered at the II Brazilian School on Statistical
Mechanics, held in Sao Carlos, Brazil, in February 2004. The main goal of the
present notes is twofold: i) t... | cond-mat_other |
Observation of Majorana Quasiparticles Surface States in Superfluid
${^3}$He-B by Heat Capacity Measurements: We report about direct measurements of heat capacity of Majorana
quasiparticles in superfluid ${^3}$He-B which appear near the surface of the
experimental bolometer on the coherence length ${\xi}$. Two bolome... | cond-mat_other |
Stability of low-dimensional multicomponent Bose gases: I show that in low dimensions the interactions in dilute Bose mixtures are
strongly renormalized, which leads to a considerable change of stability
conditions compared to the mean-field results valid in the high-density regime.
Estimates are given for the two-comp... | cond-mat_other |
Non-local density correlations as signal of Hawking radiation in BEC
acoustic black holes: We have used the analogy between gravitational systems and non-homogeneous
fluid flows to calculate the density-density correlation function of an atomic
Bose-Einstein condensate in the presence of an acoustic black hole. The
e... | cond-mat_other |
Dynamic localization in an effective tight binding Hamiltonian model
with a rapidly oscillating homogeneous electric field on a lattice: By the Magnus-Floquet approach we calculate the effective Hamiltonian for a
charged particle on the lattice subject to a homogeneous high frequency
oscillating electric field. The o... | cond-mat_other |
Critical Velocities for Roton and Super-Flow Quantum Turbulence in
Liquid $^4$He: Two different types of transitions of the superfluid $^4$He to quantum
turbulence regimes are studied for $1{\rm D}$ geometry in the case when the
influence of the normal fluid on superfluid flow is suppressed. It is shown
that the roto... | cond-mat_other |
Hard-core bosons on optical superlattices: Dynamics and relaxation in
the superfluid and insulating regimes: We study the ground-state properties and nonequilibrium dynamics of hard-core
bosons confined in one-dimensional lattices in the presence of an additional
periodic potential (superlattice) and a harmonic trap.... | cond-mat_other |
Modification to the pre-factor of the semiclassical propagator: We modify the pre-factor of the semiclassical propagator to improve its
efficiency in practical implementations. The new pre-factor represents the
smooth portion of an orbit's contribution, and leads to fast convergence in
numerical calculations. As an ill... | cond-mat_other |
Giant magnetic anisotropy of the bulk antiferromagnets IrMn and IrMn3: Theoretical predictions of the magnetic anisotropy of antiferromagnetic
materials are demanding due to a lack of experimental techniques which are
capable of a direct measurement of this quantity. At the same time it is highly
significant due to the... | cond-mat_other |
Electronic structure via potential functional approximations: The universal functional of Hohenberg-Kohn is given as a coupling-constant
integral over the density as a functional of the potential. Conditions are
derived under which potential-functional approximations are variational.
Construction via this method and im... | cond-mat_other |
Experimental realization of BCS-BEC crossover physics with a Fermi gas
of atoms: This thesis presents experiments probing physics in the crossover between
Bose-Einstein condensation (BEC) and BCS superconductivity using an ultracold
gas of atomic fermions. Scattering resonances in these ultracold gases (known
as Fesh... | cond-mat_other |
Commensurability and hysteretic evolution of vortex configurations in
rotating optical lattices: We present a theoretical study of vortices within a harmonically trapped
Bose-Einstein condensate in a rotating optical lattice. Due to the competition
between vortex-vortex interactions and pinning to the optical lattice... | cond-mat_other |
Diffusion and localization for the Chirikov typical map: We consider the classical and quantum properties of the "Chirikov typical
map", proposed by Boris Chirikov in 1969. This map is obtained from the well
known Chirikov standard map by introducing a finite number $T$ of random phase
shift angles. These angles induce... | cond-mat_other |
Trapped Fermions across a Feshbach resonance with population imbalance: We investigate the phase separation of resonantly interacting fermions in a
trap with imbalanced spin populations, both at zero and at finite temperatures.
We directly minimize the thermodynamical potential under the local density
approximation ins... | cond-mat_other |
On the free rotation of a molecule embedded in helium-4 clusters: The fact, that $^4$He atoms on different concentric circular paths around the
axis of a quantum vortex move with identically equal angular momentum, which
represents an important aspect of superfluidity of He-II, has been used to
discover a model which c... | cond-mat_other |
Laser Pulse Amplification with Bose-Einstein Condensates: This paper has been withdrawn by the author. | cond-mat_other |
Microstructure of He II in the presence of boundaries: We have studied the microstructure of a system of interacting Bose particles
under zero boundary conditions and have found two possible orderings. One
ordering is traditional and is characterized by the Bogolyubov dispersion law
E^2 = (h^2 k^2/2m)^{2} + qn\nu(k)[h^... | cond-mat_other |
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