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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 |
Electron effective mobility in strained Si/Si1-xGex MOS devices using
Monte Carlo simulation: Based on Monte Carlo simulation, we report the study of the inversion layer
mobility in n-channel strained Si/ Si1-xGex MOS structures. The influence of
the strain in the Si layer and of the doping level is studied. Universa... | cond-mat_other |
Adiabatic and Non-Adiabatic Contributions to the Free Energy from the
Electron-Phonon Interaction for Na, K, Al, and Pb: We calculate the adiabatic contributions to the free energy due to the
electron--phonon interaction at intermediate temperatures, $0 \leqslant k_{B} T
< \epsilon_{F}$ for the elemental metals Na, K... | cond-mat_other |
Superradiant scattering from a hydrodynamic vortex: We show that sound waves scattered from a hydrodynamic vortex may be
amplified. Such superradiant scattering follows from the physical analogy
between spinning black holes and hydrodynamic vortices. However a sonic horizon
analogous to the black hole event horizon doe... | cond-mat_other |
The angular momentum of a magnetically trapped atomic condensate: For an atomic condensate in an axially symmetric magnetic trap, the sum of
the axial components of the orbital angular momentum and the hyperfine spin is
conserved. Inside an Ioffe-Pritchard trap (IPT) whose magnetic field (B-field)
is not axially symmet... | 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 |
Remarks on the lattice Green's Function for the anisotropic Face
Centered Cubic Lattice: An expression for the Green's function (GF) of anisotropic face centered
cubic lattice is evaluated analytically and numerically for a single impurity
problem. The density of states (DOS), phase shift and scattering cross section... | cond-mat_other |
Effects of an oscillating field on pattern formation in a ferromagnetic
thin film: Analysis of patterns traveling at a low velocity: Magnetic domain patterns under an oscillating field is studied theoretically
by using a simple Ising-like model. We propose two ways to investigate the
effects of the oscillating field.... | cond-mat_other |
Fidelity and Quantum phase transition for the Heisenberg chain with the
next-nearest-neighbor interaction: In this paper, we investigate the fidelity for the Heisenberg chain with the
next-nearest-neighbor interaction (or the $J_1-J_2$ model) and analyze its
connections with quantum phase transition. We compute the f... | cond-mat_other |
Quantum levitation of nanoparticles seen with ultracold neutrons: Analyzing new experiments with ultracold neutrons (UCNs) we show that
physical adsorption of nanoparticles/nano-droplets, levitating in high-excited
states in a deep and broad potential well formed by van der
Waals/Casimir-Polder (vdW/CP) forces results ... | cond-mat_other |
Fast partial decoherence of a superconducting flux qubit in a spin bath: The superconducting flux qubit has two quantum states with opposite magnetic
flux. Environment of nuclear spins can find out the direction of the magnetic
flux after a decoherence time $\tau_0$ inversely proportional to the magnitude
of the flux a... | cond-mat_other |
Adiabatic self-trapped states in carbon nanotubes: We study here polaron (soliton) states of electrons or holes in a model
describing carbon-type nanotubes. In the Hamiltonian of the system we take into
account the electron-phonon interaction that arises from the deformation
dependencies of both the on-site and the hop... | cond-mat_other |
Electrical conductivity in granular media and Branly's coherer: A simple
experiment: We show how a simple laboratory experiment can illustrate certain electrical
transport properties of metallic granular media. At a low critical imposed
voltage, a transition from an insulating to a conductive state is observed.
This ... | cond-mat_other |
Thermally induced rotons in two-dimensional dilute Bose gases: We show that roton-like excitations are thermally induced in a
two-dimensional dilute Bose gas as a consequence of the strong phase
fluctuations in two dimensions. At low momentum, the roton-like excitations
lead for small enough temperatures to an anomalou... | cond-mat_other |
Self-similar space-filling sphere packings in three and four dimensions: Inversive geometry can be used to generate exactly self-similar space-filling
sphere packings. We present a construction method in two dimensions and
generalize it to search for packings in higher dimensions. We newly discover 29
three-dimensional... | cond-mat_other |
Influence of Exchange Scattering on Superfluid He-3 states in Nematic
Aerogel: The superfluid state in bulk liquid $^3$He is realized in the form of A or B
phases. Uniaxially anisotropic aerogel (nafen) stabilizes transition from the
normal to the polar superfluid state which on further cooling transitions to
the axi... | cond-mat_other |
Partially incoherent gap solitons in Bose-Einstein condensates: We construct families of incoherent matter-wave solitons in a repulsive
degenerate Bose gas trapped in an optical lattice (OL), i.e., gap solitons, and
investigate their stability at zero and finite temperature, using the
Hartree-Fock-Bogoliubov equations.... | cond-mat_other |
Mechanisms limiting the coherence time of spontaneous magnetic
oscillations driven by DC spin-polarized currents: The spin-transfer torque from a DC spin-polarized current can generate
highly-coherent magnetic precession in nanoscale magnetic-multilayer devices.
By measuring linewidths of spectra from the resulting r... | cond-mat_other |
Electronic states in 1/1 Cd6Yb and 1/1 Cd6Ca: Relativistic, correlation,
and structural effects: The electronic structure of the rational approximants 1/1 Cd6Yb and 1/1 Cd6Ca
to the stable icosahedral CdYb and CdCa quasicrystals is studied by the
full-potential linear augmented plane wave method. A comparison is made... | cond-mat_other |
Magneto-optic far-infrared study of Sr$_{14}$Cu$_{24}$O$_{41}$: triplet
excitations in chains: Using far-infrared spectroscopy we have studied the magnetic field and
temperature dependence of the spin gap modes in the chains of
Sr$_{14}$Cu$_{24}$O$_{41}$. Two triplet modes T$_1$ and T$_2$ were found in the
center of ... | cond-mat_other |
Low-frequency noise and tunnelling magnetoresistance in
Fe(110)/MgO(111)/Fe(110) epitaxial magnetic tunnel junctions: We report on tunnelling magnetoresistance (TMR), current-voltage (IV)
characteristics and low frequency noise in epitaxially grown
Fe(110)/MgO(111)/Fe(110) magnetic tunnel junctions (MTJs) with dimens... | cond-mat_other |
Physical and mathematical justification of the numerical Brillouin zone
integration of the Boltzmann rate equation by Gaussian smearing: Scatterings of electrons at quasiparticles or photons are very important for
many topics in solid state physics, e.g., spintronics, magnonics or photonics,
and therefore a correct n... | cond-mat_other |
On the evolution of higher order fluxes in non-equilibrium
thermodynamics: The connection between the balance structure of the evolution equations of
higher order fluxes and different forms of the entropy current is investigated
on the example of rigid heat conductors. Compatibility conditions of the
theories are giv... | cond-mat_other |
Quantum fluctuations of a vortex in a dilute Bose-Einstein condensate: A vortex in a quasi two-dimensional Bose-Einstein condensate is subject to
the Magnus force and can be effectively described as a planar particle in a
uniform magnetic field. Quantization of this effective particle leads to the
lowest Landau level w... | cond-mat_other |
Ground State of Quantum Jahn-Teller Model: Selftrapping vs Correlated
Phonon-assisted Tunneling: Ground state of the quantum Jahn-Teller model with broken rotational symmetry
was investigated by the variational approach in two cases: a lattice and a
local ones. Both cases differ by the way of accounting for the nonli... | cond-mat_other |
On the effect of superfluid flows on the interaction of microwaves with
He II: The paper proposes a possible mechanism of interaction of microwaves with
superfluid helium that results in an experimentally observed narrow peak of
microwave absorption on the frequencies by the order of the roton frequency.
The obtained... | cond-mat_other |
Momentum distribution dynamics of a Tonks-Girardeau gas: Bragg
reflections of a quantum many-body wavepacket: The dynamics of the momentum distribution and the reduced single-particle
density matrix (RSPDM) of a Tonks-Girardeau (TG) gas is studied in the context
of Bragg-reflections of a many-body wavepacket. We find... | cond-mat_other |
Velocity correlations in dense granular flows: Velocity fluctuations of grains flowing down a rough inclined plane are
experimentally studied. The grains at the free surface exhibit fluctuating
motions, which are correlated over few grains diameters. The characteristic
correlation length is shown to depend on the incli... | cond-mat_other |
First-principles calculations of the phonon dispersion curves of H on
Pt(111): We have calculated the surface phonon dispersion curves for H on Pt(111),
using first-principles, total energy calculations based on a mixed-basis set
and norm-conserving pseudopotentials. Linear response theory and the harmonic
approximat... | cond-mat_other |
Self-focusing magnetostatic beams in thin magnetic films: The possibility of generation of stable self-focusing beams in in-plane
magnetized thin magnetic films is considered and theoretical conditions for the
existence of such localized solutions are discussed. It is shown that for the
definite direction between stati... | cond-mat_other |
Heteronuclear molecules in an optical dipole trap: We report on the creation and characterization of heteronuclear KRb Feshbach
molecules in an optical dipole trap. Starting from an ultracold gas mixture of
K-40 and Rb-87 atoms, we create as many as 25,000 molecules at 300 nK by rf
association. Optimizing the associati... | cond-mat_other |
Coherence-enhanced imaging of a degenerate Bose gas: We present coherence-enhanced imaging, an in situ technique that uses Raman
superradiance to probe the spatial coherence properties of an ultracold gas.
Applying this method, we obtain a spatially resolved measurement of the
condensate number and more generally, of t... | cond-mat_other |
Spectrum and Screening cloud in the central spin model: We consider an electronic spin in a quantum dot, coupled to the surrounding
nuclear spins via inhomogeneous antiferromagnetic hyperfine interactions and
subject to a uniform field, which is described by Gaudin's central spin model.
We study spectral properties, th... | cond-mat_other |
The role of the spin in quasiparticle interference: Quasiparticle interference patterns measured by scanning tunneling microscopy
(STM) can be used to study the local electronic structure of metal surfaces and
high temperature superconductors. Here, we show that even in non-magnetic
systems the spin of the quasiparticl... | cond-mat_other |
Multiple time scales and the exponential Ornstein-Uhlenbeck stochastic
volatility model: We study the exponential Ornstein-Uhlenbeck stochastic volatility model and
observe that the model shows a multiscale behavior in the volatility
autocorrelation. It also exhibits a leverage correlation and a probability
profile f... | cond-mat_other |
Coherent control theory and experiment of optical phonons in diamond: The coherent control of optical phonons has been experimentally demonstrated
in various physical systems. While the transient dynamics for optical phonons
can be explained by phenomenological models, the coherent control experiment
cannot be explaine... | cond-mat_other |
Propagation of self-localised Q-ball solitons in the $^3$He universe: In relativistic quantum field theories, compact objects of interacting bosons
can become stable owing to conservation of an additive quantum number $Q$.
Discovering such $Q$-balls propagating in the Universe would confirm
supersymmetric extensions of... | cond-mat_other |
Superfluid Edge Dislocation: Transverse Quantum Fluid: Recently, it has been argued by Kuklov et al., that unusual features
associated with the superflow-through-solid effect observed in solid He4 can be
explained by unique properties of dilute distribution of superfluid edge
dislocations. We demonstrate that stability... | cond-mat_other |
Generalisation of Gilbert damping and magnetic inertia parameter as a
series of higher-order relativistic terms: The phenomenological Landau-Lifshitz-Gilbert (LLG) equation of motion remains
as the cornerstone of contemporary magnetisation dynamics studies, wherein the
Gilbert damping parameter has been attributed to... | cond-mat_other |
Fundamental dissipation due to bound fermions in the zero-temperature
limit: The ground state of a fermionic condensate is well protected against
perturbations in the presence of an isotropic gap. Regions of gap suppression,
surfaces and vortex cores which host Andreev-bound states, seemingly lift that
strict protect... | cond-mat_other |
Effective magnetic fields in degenerate atomic gases induced by light
beams with orbital angular momenta: We investigate the influence of two resonant laser beams on the mechanical
properties of degenerate atomic gases. The control and probe beams of light are
considered to have Orbital Angular Momenta (OAM) and act ... | cond-mat_other |
Exact soliton solution of Spin Chain with a external magnetic field in
linear wave background: Employing a simple, straightforward Darboux transformation we construct exact
N-soliton solution for anisotropic spin chain driven by a external magnetic
field in linear wave background. As a special case the explicit one- ... | cond-mat_other |
Mass flux and solid growth in solid 4He: 60 mK - 700 mK: We use the thermo-mechanical effect to create a chemical potential difference
between two liquid reservoirs connected to each other through Vycor rods in
series with solid hcp 4He to confirm that a DC flux of atoms takes place below
600 mK, but find that the flux... | cond-mat_other |
Range separation combined with the Overhauser model: Application to the
H$_2$ molecule along the dissociation curve: The combination of density-functional theory with other approaches to the
many-electron problem through the separation of the electron-electron
interaction into a short-range and a long-range contribut... | cond-mat_other |
p-wave Feshbach molecules: We have produced and detected molecules using a p-wave Feshbach resonance
between 40K atoms. We have measured the binding energy and lifetime for these
molecules and we find that the binding energy scales approximately linearly
with magnetic field near the resonance. The lifetime of bound p-w... | cond-mat_other |
Anyons from fermions with conventional two-body interactions: Emergent anyons are the key elements of the topological quantum computation
and topological quantum memory. We study a two-component fermion model with
conventional two-body interaction in an open boundary condition and show that
several subsets in the low-l... | cond-mat_other |
Spin motive forces due to magnetic vortices and domain walls: We study spin motive forces, i.e, spin-dependent forces, and voltages induced
by time-dependent magnetization textures, for moving magnetic vortices and
domain walls. First, we consider the voltage generated by a one-dimensional
field-driven domain wall. Nex... | cond-mat_other |
Magnetic Domain Wall Pumping by Spin Transfer Torque: We show that spin transfer torque from direct spin-polarized current applied
parallel to a magnetic domain wall (DW) induces DW motion in a direction
independent of the current polarity. This unidirectional response of the DW to
spin torque enables DW pumping: long-... | cond-mat_other |
Heteronuclear quantum gas mixtures: This PhD tutorial article is a review of our experiments on heteronuclear
quantum gas mixtures at the University of Hamburg. We introduce basic
properties of trapped Fermi-Bose mixtures and demonstrate the achievement of
large quantum degenerate mixtures of 40K and 87Rb. Using hetero... | cond-mat_other |
Dynamics of a Bright Soliton in Bose-Einstein condensates with
Time-Dependent Atomic Scattering Length in an Expulsive Parabolic Potential: We present a family of exact solutions of one-dimensional nonlinear
Schr\"odinger equation, which describe the dynamics of a bright soliton in
Bose-Einstein condensates with the ... | cond-mat_other |
Cross-sections of Andreev scattering by quantized vortex rings in 3He-B: We studied numerically the Andreev scattering cross-sections of
three-dimensional isolated quantized vortex rings in superfluid 3He-B at
ultra-low temperatures. We calculated the dependence of the cross-section on
the ring's size and on the angle ... | cond-mat_other |
Modelling the term structure of interest rates á la
Heath-Jarrow-Morton but with non Gaussian fluctuations: We consider a generalization of the Heath Jarrow Morton model for the term
structure of interest rates where the forward rate is driven by Paretian
fluctuations. We derive a generalization of It\^{o}'s lemma fo... | cond-mat_other |
High domain wall velocities induced by current in ultrathin Pt/Co/AlOx
wires with perpendicular magnetic anisotropy: Current-induced domain wall (DW) displacements in an array of ultrathin
Pt/Co/AlOx wires with perpendicular magnetic anisotropy have been directly
observed by wide field Kerr microscopy. DWs in all wir... | cond-mat_other |
Strongly Interacting Atoms and Molecules in a 3D Optical Lattice: We report on the realization of a strongly interacting quantum degenerate gas
of fermionic atoms in a three-dimensional optical lattice. We prepare a
band-insulating state for a two-component Fermi gas with one atom per spin
state per lattice site. Using... | cond-mat_other |
Density modulations in an elongated Bose-Einstein condensate released
from a disordered potential: We observe large density modulations in time-of-flight images of elongated
Bose-Einstein condensates, initially confined in a harmonic trap and in the
presence of weak disorder. The development of these modulations duri... | cond-mat_other |
On surface plasmon polariton wavepacket dynamics in metal-dielectric
heterostructures: The WKB equations for dynamics of the surface plasmon polariton (SPP)
wavepacket are studied. The dispersion law for the SPP in the metal-dielectric
heterostructure with varying thickness of a perforated dielectric layer is
rigorou... | cond-mat_other |
Nanoscale spin-polarization in dilute magnetic semiconductor (In,Mn)Sb: Results of point contact Andreev reflection (PCAR) experiments on (In,Mn)Sb
are presented and analyzed in terms of current models of charge conversion at a
superconductor-ferromagnet interface. We investigate the influence of surface
transparency, ... | cond-mat_other |
Phase diagram of a Bose gas near a wide Feshbach resonance: In this paper, we study the phase diagram of a homogeneous Bose gas with a
repulsive interaction near a wide Feshbach resonance at zero temperature. The
Bose-Einstein-condensation (BEC) state of atoms is a metastable state. When the
scattering length $a$ excee... | cond-mat_other |
Simple derivation of the frequency dependent complex heat capacity: This paper gives a simple derivation of the well-known expression of the
frequency dependent complex heat capacity in modulated temperature experiments.
It aims at clarified again that the generalized calorimetric susceptibility is
only due to the non-... | cond-mat_other |
PT-Symmetric Electronics: We show both theoretically and experimentally that a pair of inductively
coupled active LRC circuits (dimer), one with amplification and another with an
equivalent amount of attenuation, display all the features which characterize a
wide class of non-Hermitian systems which commute with the jo... | cond-mat_other |
Number statistics of molecules formed from ultra-cold atoms: We calculate the number statistics of a single-mode molecular field excited
by photoassociation or via a Feshbach resonance from an atomic Bose-Einstein
condensate (BEC), a normal atomic Fermi gas and a Fermi system with pair
correlations (BCS state). We find... | cond-mat_other |
Determination of anisotropic dipole moments in self-assembled quantum
dots using Rabi oscillations: By investigating the polarization-dependent Rabi oscillations using
photoluminescence spectroscopy, we determined the respective transition dipole
moments of the two excited excitonic states |Ex> and |Ey> of a single
s... | cond-mat_other |
Chern-number spin Hamiltonians for magnetic nano-clusters by DFT methods: Combining field-theoretical methods and ab-initio calculations, we construct
an effective Hamiltonian with a single giant-spin degree of freedom, capable of
the describing the low-energy spin dynamics of ferromagnetic metal nanoclusters
consistin... | cond-mat_other |
3He on preplated graphite: By using the diffusion Monte Carlo method, we obtained the full phase diagram
of $^3$He on top of graphite preplated with a solid layer of $^4$He. All the
$^4$He atoms of the substrate were explicitly considered and allowed to move
during the simulation. We found that the ground state is a li... | cond-mat_other |
Dipole moments from atomic-number-dependent potentials in analytic
density-functional theory: Molecular dipole moments of analytic density-functional theory are
investigated. The effect of element-dependent exchange potentials on these
moments are examined by comparison with conventional quantum-chemical methods
and ... | cond-mat_other |
Terahertz Kerr effect: We have observed optical birefringence in liquids induced by single-cycle THz
pulses with field strengths exceeding 100 kV/cm. The induced change in
polarization is proportional to the square of the THz electric field. The
time-dependent THz Kerr signal is composed of a fast electronic response t... | cond-mat_other |
Efficient unidirectional nanoslit couplers for surface plasmons: Plasmonics is based on surface plasmon polariton (SPP) modes which can be
laterally confined below the diffraction limit, thereby enabling ultracompact
optical components. In order to exploit this potential, the fundamental
bottleneck of poor light-SPP co... | cond-mat_other |
Numerical study of gas dynamic processes in conditions of silver
nanocluster deposition experiments: In this paper, experiments on the deposition of silver nanoclusters are
analysed numerically using improved DSMC method. These experiments were made in
the Institute of Thermophysics SB RAS recent years, in the contex... | cond-mat_other |
Fundamental dissipation due to bound fermions in the zero-temperature
limit: The ground state of a fermionic condensate is well protected against
perturbations in the presence of an isotropic gap. Regions of gap suppression,
surfaces and vortex cores which host Andreev-bound states, seemingly lift that
strict protect... | cond-mat_other |
Effect of the Zero-Mode on the Response of a Trapped Bose-Condensed Gas: The dynamical response of a trapped Bose-Einstein condensate (BEC) is
formulated consistently with quantum field theory and is numerically evaluated.
We regard the BEC as a manifestation of the breaking of the global phase
symmetry. Then, the Gold... | cond-mat_other |
Nucleation of helium in liquid lithium: Fusion energy stands out as a promising alternative for a future decarbonised
energy system. To be sustainable, future fusion nuclear reactors will have to
produce their own tritium. In the so-called breeding blanket of a reactor, the
neutron bombardment of lithium will produce t... | cond-mat_other |
Quantum Ratchets at High Temperatures: Using the continued-fraction method we solve the Caldeira-Leggett master
equation in the phase-space (Wigner) representation to study Quantum ratchets.
Broken spatial symmetry, irreversibility and periodic forcing allows for a net
current in these systems. We calculate this curren... | cond-mat_other |
Three-dimensional character of atom-chip-based rf-dressed potentials: We experimentally investigate the properties of radio-frequency-dressed
potentials for Bose-Einstein condensates on atom chips. The three-dimensional
potential forms a connected pair of parallel waveguides. We show that
rf-dressed potentials are robu... | cond-mat_other |
Quench dynamics and non equilibrium phase diagram of the Bose-Hubbard
model: We investigate the time evolution of correlations in the Bose-Hubbard model
following a quench from the superfluid to the Mott insulating phase. For large
values of the final interaction strength the system approaches a distinctly
non-equili... | cond-mat_other |
Static Electric Field in a 1D Systems without Boundaries: In this brief report, we show that in a 1D system with unit-cell doubling,
the coefficient of the $\theta$-term is not only determined the topological
index, $\int i\bra{u_k}\frac{\d}{\d k}\ket{u_k}{\rm d}k$. Specifically, the
relative position between the elect... | cond-mat_other |
The Kelvin-wave cascade in the vortex filament model: The energy transfer mechanism in zero temperature superfluid turbulence of
helium-4 is still a widely debated topic. Currently, the main hypothesis is
that weakly nonlinear interacting Kelvin waves transfer energy to sufficiently
small scales such that energy is dis... | cond-mat_other |
Polarization fine-structure and enhanced single-photon emission of
self-assembled lateral InGaAs quantum dot molecules embedded in a planar
micro-cavity: Single lateral InGaAs quantum dot molecules have been embedded in a planar
micro-cavity in order to increase the luminescence extraction efficiency. Using
a combi... | cond-mat_other |
Correlations in Ultracold Trapped Few-Boson Systems: Transition from
Condensation to Fermionization: We study the correlation properties of the ground states of few ultracold
bosons, trapped in double wells of varying barrier height in one dimension.
Extending previous results on the signature of the transition from ... | cond-mat_other |
Shape dynamics during deposit of simple metal clusters on rare gas
matrices: Using a combined quantum mechanical/classical method, we study the collisions
of small Na clusters on large Ar clusters as a model for cluster deposit. We
work out basic mechanisms by systematic variation of collision energy, system
sizes, a... | cond-mat_other |
Adiabatic Connection in the Low-Density Limit: In density functional theory (DFT), the exchange-correlation functional can
be exactly expressed by the adiabatic connection integral. It has been noticed
that as lambda goes to infinity, the lambda^(-1) term in the expansion of
W(lambda) vanishes. We provide a simple but ... | cond-mat_other |
Sodium Bose-Einstein Condensates in an Optical Lattice: The phase transition from a superfluid to a Mott insulator has been observed
in a $^{23}$Na Bose-Einstein condensate. A dye laser detuned $\approx 5$nm red
of the Na $3^2$S$ \to 3^2$P$_{1/2}$ transition was used to form the three
dimensional optical lattice. The h... | cond-mat_other |
High intermodulation gain in a micromechanical Duffing resonator: In this work we use a micromechanical resonator to experimentally study small
signal amplification near the onset of Duffing bistability. The device consists
of a PdAu beam serving as a micromechanical resonator excited by an adjacent
gate electrode. A l... | cond-mat_other |
Extreme times in financial markets: We apply the theory of continuous time random walks to study some aspects of
the extreme value problem applied to financial time series. We focus our
attention on extreme times, specifically the mean exit time and the mean
first-passage time. We set the general equations for these ex... | cond-mat_other |
Dynamics of the vortex line density in superfluid counterflow turbulence: Describing superfluid turbulence at intermediate scales between the
inter-vortex distance and the macroscale requires an acceptable equation of
motion for the density of quantized vortex lines $\cal{L}$. The closure of such
an equation for superf... | cond-mat_other |
Non-equilibrium dynamics of a Bose-Einstein condensate in an optical
lattice: The dynamical evolution of a Bose-Einstein condensate trapped in a
one-dimensional lattice potential is investigated theoretically in the
framework of the Bose-Hubbard model. The emphasis is set on the
far-from-equilibrium evolution in a ca... | cond-mat_other |
Bound states of attractive Bose-Einstein condensates in shallow traps in
two and three dimensions: Using variational and numerical solutions of the mean-field Gross-Pitaevskii
equation for attractive interaction (with cubic or Kerr nonlinearity) we show
that a stable bound state can appear in a Bose-Einstein condensa... | cond-mat_other |
Stationary waves in a supersonic flow of a two-component Bose gas: A stationary wave pattern occurring in a flow of a two-component
Bose-Einstein condensate past an obstacle is studied. We consider the general
case of unequal velocities of two superfluid components. The Landau criterium
applied to the two-component sys... | cond-mat_other |
Quantum Monte Carlo study of ring-shaped polariton parametric
luminescence in a semiconductor microcavity: We present a quantum Monte Carlo study of the quantum correlations in the
parametric luminescence from semiconductor microcavities in the strong
exciton-photon coupling regime. As already demonstrated in recent ... | cond-mat_other |
Bose-Einstein condensate in a quartic potential: Static and Dynamic
properties: In this paper, we present a theoretical study of a Bose-Einstein condensate
of interacting bosons in a quartic trap in one, two, and three dimensions.
Using Thomas-Fermi approximation, suitably complemented by numerical solutions
of the G... | cond-mat_other |
Potential energy threshold for nano-hillock formation by impact of slow
highly charged ions on a CaF$_2$(111) surface: We investigate the formation of nano-sized hillocks on the (111) surface of
CaF$_2$ single crystals by impact of slow highly charged ions. Atomic force
microscopy reveals a surprisingly sharp and wel... | cond-mat_other |
Nanoelectromechanical systems based on multi-walled nanotubes:
nanothermometer, nanorelay and nanoactuator: We report on three new types of nanoelectromechanical systems based on carbon
nanotubes: an electromechanical nanothermometer, a nanorelay and a nanomotor.
The nanothermometer can be used for accurate temperatu... | cond-mat_other |
Thomas-Fermi Screening in Graphene: The in-plane static screening of the field originated by a charge placed in a
graphene sheet is investigated. A self-consistent field equation in the real
space domain is obtained by using a suitable Thomas-Fermi procedure. Exact and
approximated (for qualitative considerations) solu... | cond-mat_other |
Exciton Spin Dynamics in Semiconductor Quantum Wells: In this paper we will review Exciton Spin Dynamics in Semiconductor Quantum
Wells. The spin properties of excitons in nanostructures are determined by
their fine structure. We will mainly focus in this review on GaAs and InGaAs
quantum wells which are model systems. | cond-mat_other |
Nonlinear Electrokinetics at large applied voltages: The classical theory of electrokinetic phenomena assumes a dilute solution of
point-like ions in chemical equilibrium with a surface whose double-layer
voltage is of order the thermal voltage, $k_BT/e = 25$ mV. In nonlinear
``induced-charge'' electrokinetic phenomena... | cond-mat_other |
Numerical observation of Hawking radiation from acoustic black holes in
atomic Bose-Einstein condensates: We report numerical evidence of Hawking emission of Bogoliubov phonons from a
sonic horizon in a flowing one-dimensional atomic Bose-Einstein condensate. The
presence of Hawking radiation is revealed from peculia... | cond-mat_other |
Resonant Dimer Relaxation in Cold Atoms with a Large Scattering Length: Efimov physics refers to universal phenomena associated with a discrete
scaling symmetry in the 3-body problem with a large scattering length. The
first experimental evidence for Efimov physics was the recent observation of a
resonant peak in the 3... | cond-mat_other |
Ratchet, pawl and spring Brownian motor: We present a model for a thermal Brownian motor based on Feynman's famous
ratchet and pawl device. Its main feature is that the ratchet and the pawl are
in different thermal baths and connected by an harmonic spring. We simulate its
dynamics, explore its main features and also d... | cond-mat_other |
Quantum phases of hardcore bosons with long-range interactions on a
square lattice: We study the ground-state phase diagrams of hardcore bosons with long-range
interactions on a square lattice using the linear spin-wave theory and a
cluster mean-field method. Specifically, we consider the two types of
long-range inte... | cond-mat_other |
Density-functional theory of nonequilibrium tunneling: Nanoscale optoelectronics and molecular-electronics systems operate with
current injection and nonequilibrium tunneling, phenomena that challenge
consistent descriptions of the steady-state transport. The current affects the
electron-density variation and hence the... | cond-mat_other |
On surface plasmon polariton wavepacket dynamics in metal-dielectric
heterostructures: The WKB equations for dynamics of the surface plasmon polariton (SPP)
wavepacket are studied. The dispersion law for the SPP in the metal-dielectric
heterostructure with varying thickness of a perforated dielectric layer is
rigorou... | cond-mat_other |
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