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A Time-Orbiting Potential Trap for Bose-Einstein Condensate
Interferometry: We describe a novel atom trap for Bose-Einstein condensates of 87Rb to be
used in atom interferometry experiments. The trap is based on a time-orbiting
potential waveguide. It supports the atoms against gravity while providing weak
confinemen... | cond-mat_other |
Diamagnetism and the dispersion of the magnetic permeability: It is well known that the usual Kramers--Kronig relations for the relative
permeability function $\mu(\omega)$ are not compatible with diamagnetism
($\mu(0)<1$) and a positive imaginary part ($\text{Im}\,\mu(\omega)>0$ for
$\omega>0$). We demonstrate that a ... | cond-mat_other |
Influence of topography and Co domain walls on the magnetization
reversal of the FeNi layer in FeNi/Al$\_2$O$\_3$/Co magnetic tunnel junctions: We have studied the magnetization reversal dynamics of FeNi/Al$\_2$O$\_3$/Co
magnetic tunnel junctions deposited on step-bunched Si substrates using
magneto-optical Kerr effe... | cond-mat_other |
Spin-Exchange Interaction in ZnO-based Quantum Wells: Wurtzitic ZnO/(Zn,Mg)O quantum wells grown along the (0001) direction permit
unprecedented tunability of the short-range spin exchange interaction. In the
context of large exciton binding energies and electron-hole exchange
interaction in ZnO, this tunability result... | cond-mat_other |
A basis-set based Fortran program to solve the Gross-Pitaevskii Equation
for dilute Bose gases in harmonic and anharmonic traps: Inhomogeneous boson systems, such as the dilute gases of integral spin atoms
in low-temperature magnetic traps, are believed to be well described by the
Gross-Pitaevskii equation (GPE). GPE... | cond-mat_other |
Fully three dimensional breather solitons can be created using Feshbach
resonance: We investigate the stability properties of breather solitons in a
three-dimensional Bose-Einstein Condensate with Feshbach Resonance Management
of the scattering length and con ned only by a one dimensional optical lattice.
We compare ... | 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 |
Rabi switch of condensate wavefunctions in a multicomponent Bose gas: Using a time-dependent linear (Rabi) coupling between the components of a
weakly interacting multicomponent Bose-Einstein condensate (BEC), we propose a
protocol for transferring the wavefunction of one component to the other. This
"Rabi switch" can ... | cond-mat_other |
Confinement-induced resonances for a two-component ultracold atom gas in
arbitrary quasi-one-dimensional traps: We solve the two-particle s-wave scattering problem for ultracold atom gases
confined in arbitrary quasi-one-dimensional trapping potentials, allowing for
two different atom species. As a consequence, the c... | cond-mat_other |
Strong coupling theory for the superfluidity of Bose-Fermi mixtures: We develop a strong-coupling theory for the superfluidity of fermion pairing
phase in a Bose-Fermi mixture. Dynamical screening, self-energy
renormalization, and a pairing gap function are included self-consistently
within the adiabatic limit (i.e., t... | cond-mat_other |
Coexisting ordinary elasticity and superfluidity in a model of
defect-free supersolid: We present the mechanics of a model of supersolid in the frame of the
Gross-Pitaevskii equation at $T=0K$ that do not require defects nor vacancies.
A set of coupled nonlinear partial differential equations plus boundary
conditions... | cond-mat_other |
Spin dynamics for bosons in an optical lattice: We study the internal dynamics of bosonic atoms in an optical lattice. Within
the regime in which the atomic crystal is a Mott insulator with one atom per
well, the atoms behave as localized spins which interact according to some spin
Hamiltonian. The type of Hamiltonian ... | cond-mat_other |
Extracting spectral density function of a binary composite without
a-priori assumption: The spectral representation separates the contributions of geometrical
arrangement (topology) and intrinsic constituent properties in a composite. The
aim of paper is to present a numerical algorithm based on the Monte Carlo
integ... | cond-mat_other |
STM Studies of TbTe3: Evidence for a fully Incommensurate Charge Density
Wave: We observe unidirectional charge density wave ordering on the cleaved surface
of TbTe3 with a Scanning Tunneling Microscope at ~6 K. The modulation
wave-vector q_{CDW} as determined by Fourier analysis is 0.71 +/- 0.02 * 2
pi/c. (Where c i... | cond-mat_other |
Energy and Vorticity Spectra in Turbulent Superfluid $^4$He from $T=0$
to $T_λ$: We discuss the energy and vorticity spectra of turbulent superfluid $^4$He in
all the temperature range from $T=0$ up to the phase transition "$\lambda$
point", $T_\lambda\simeq 2.17\,$K. Contrary to classical developed turbulence
in whi... | cond-mat_other |
Imaging of s and d partial-wave interference in quantum scattering of
identical bosonic atoms: We report on the direct imaging of s and d partial-wave interference in cold
collisions of atoms. Two ultracold clouds of Rb87 atoms were accelerated by
magnetic fields to collide at energies near a d-wave shape resonance. ... | cond-mat_other |
Mean-field dynamics of a two-mode Bose-Einstein condensate subject to
noise and dissipation: We discuss the dynamics of an open two-mode Bose-Hubbard system subject to
phase noise and particle dissipation. Starting from the full many-body dynamics
described by a master equation the mean-field limit is derived resulti... | cond-mat_other |
Probing Strong Correlations with Light Scattering: the Example of the
Quantum Ising model: In this paper we calculate the nonlinear susceptibility and the resonant
Raman cross section for the paramagnetic phase of the ferromagnetic Quantum
Ising model in one dimension. In this region the spectrum of the Ising model
h... | cond-mat_other |
Natural orbits of atomic Cooper pairs in a nonuniform Fermi gas: We examine the basic mode structure of atomic Cooper pairs in an
inhomogeneous Fermi gas. Based on the properties of Bogoliubov quasi-particle
vacuum, the single particle density matrix and the anomalous density matrix
share the same set of eigenfunctions... | cond-mat_other |
Cluster states of Fermions in the single l-shell model: The paper concerns the ground state structure of the partly filled l-shell of
a fermionic gas of atoms of spin s in a spherically symmetric spin independent
trap potential. At particle numbers N=n(2s+1), n=1,2,...,2l+1 the basic
building blocks are clusters consis... | cond-mat_other |
On the Order Parameter of the Continuous Phase Transition in the
Classical and Quantum Mechanical limits: The mean field theory is revisited in the classical and quantum mechanical
limits. Taking into account the boundary conditions at the phase transition and
the third law of the thermodynamics the physical properti... | cond-mat_other |
Reply to Comment on "Dynamics of the Density of Quantized Vortex-Lines
in Superfluid Turbulence": This is a Reply to Nemirovskii Comment [Phys. Rev. B 94, 146501 (2016)] on
the Khomenko et al, [Phys.Rev. B v.91, 180504(2016)], in which a new form of
the production term in Vinen's equation for the evolution of the vor... | cond-mat_other |
Sufficient conditions for two-dimensional localization by arbitrarily
weak defects in periodic potentials with band gaps: We prove, via an elementary variational method, 1d and 2d localization within
the band gaps of a periodic Schrodinger operator for any mostly negative or
mostly positive defect potential, V, whose... | cond-mat_other |
Self-consistent calculation of semiconductor heterojunctions by using
quantum genetic algorithm: In this study, we have investigated the ground state energy level of
electrons in modulation doped GaAs/AlxGa1-xAs heterojunctions. For this
purpose, Schrodinger and Poisson equations are solved self consistently using
qu... | cond-mat_other |
Residual attractive force between superparamagnetic nanoparticles: A superparamagnetic nanoparticle (SPN) is a nanometre-sized piece of a
material that would, in bulk, be a permanent magnet. In the SPN the individual
atomic spins are aligned via Pauli effects into a single giant moment that has
easy orientations set by... | cond-mat_other |
Spin wave diffraction model for perpendicularly magnetized films: We present a near-field diffraction model for spin waves in perpendicularly
magnetized films applicable in any geometries of excitation fields. This model
relies on Kalinikos-Slavin formalism to express the dynamic susceptibility
tensor in k-space, and c... | cond-mat_other |
Extraordinary wetting phase diagram for mixtures of Bose-Einstein
condensates: The possibility of wetting phase transitions in Bose-Einstein condensed gases
is predicted on the basis of Gross-Pitaevskii theory. The surface of a binary
mixture of Bose-Einstein condensates can undergo a first-order wetting phase
transi... | cond-mat_other |
Three-fermion problems in optical lattices: We present exact results for the spectra of three fermionic atoms in a single
well of an optical lattice. For the three lowest hyperfine states of Li6 atoms,
we find a Borromean state across the region of the distinct pairwise Feshbach
resonances. For K40 atoms, nearby Feshba... | cond-mat_other |
Coherent spinor dynamics in a spin-1 Bose condensate: Collisions in a thermal gas are perceived as random or incoherent as a
consequence of the large numbers of initial and final quantum states accessible
to the system. In a quantum gas, e.g. a Bose-Einstein condensate or a
degenerate Fermi gas, the phase space accessi... | cond-mat_other |
Dynamical equations for time-ordered Green's functions: from the Keldysh
time-loop contour to equilibrium at finite and zero temperature: We study the dynamical equation of the time-ordered Green's function at
finite temperature. We show that the time-ordered Green's function obeys a
conventional Dyson equation only ... | cond-mat_other |
Suppression of Superfluidity of $^4$He in a Nanoporous Glass by
Preplating a Kr Layer: Helium in nanoporous media has attracted much interest as a model Bose system
with disorder and confinement. Here we have examined how a change in porous
structure by preplating a monolayer of krypton affects the superfluid
propert... | cond-mat_other |
Bounds for the Superfluid Fraction from Exact Quantum Monte Carlo Local
Densities: For solid 4He and solid p-H2, using the flow-energy-minimizing one-body phase
function and exact T=0 K Monte Carlo calculations of the local density, we have
calculated the phase function, the velocity profile and upper bounds for the
... | cond-mat_other |
Ultracold Atoms in 1D Optical Lattices: Mean Field, Quantum Field,
Computation, and Soliton Formation: In this work, we highlight the correspondence between two descriptions of a
system of ultracold bosons in a one-dimensional optical lattice potential: (1)
the discrete nonlinear Schr\"{o}dinger equation, a discrete ... | cond-mat_other |
Negative refraction and plano-concave lens focusing in one-dimensional
photonic crystals: Negative refraction is demonstrated in one-dimensional (1D) dielectric
photonic crystals (PCs) at microwave frequencies. Focusing by plano-concave
lens made of 1D PC due to negative refraction is also demonstrated. The
frequency... | cond-mat_other |
Exchange coupling in transition metal monoxides: Electronic structure
calculations: An ab initio study of magnetic exchange interactions in antiferromagnetic and
strongly correlated 3d transition metal monoxides is presented. Their
electronic structure is calculated using the local self-interaction correction
approac... | cond-mat_other |
Low frequency excitations of C60 chains inserted inside single-walled
carbon nanotubes: The low frequency excitations of C60 chains inserted inside single-walled
carbon nanotubes (SWNTs) have been studied by inelastic neutron scattering
(INS) on a high quality sample of peapods. The comparison of the
neutron-derived ... | cond-mat_other |
A Derivation of the Classical Einstein-Dirac-Maxwell Equations From a
Model of an Elastic Medium: Starting from a model of an elastic medium, partial differential equations
with the form of the coupled Einstein-Dirac-Maxwell equations are derived. The
form of these equations describes particles with mass and spin cou... | cond-mat_other |
Plasmonic engineering of metal nanoparticles for enhanced fluorescence
and Raman scattering: We have investigated the effects of tuning the localized surface plasmon
resonances (LSPRs) of silver nanoparticles on the fluorescence intensity,
lifetime, and Raman signal from nearby fluorophores. The presence of a metalli... | 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 |
Comments on "Mixed Bose-Fermi statistics Kinetic equation and navigation
through network" by S.F. Chekmarev, Phys. Rev. E 82, 026106 (2010): The paper shows that the kinetic equations considered in [1], equilibrium
distribution obtained in [1], and results and conclusions obtained on the basis
of the kinetic equation... | cond-mat_other |
Exact Solitonic Solutions of the Gross-Pitaevskii Equation with a Linear
Potential: We derive classes of exact solitonic solutions of the time-dependent
Gross-Pitaevskii equation with repulsive and attractive interatomic
interactions. The solutions correspond to a string of bright solitons with
phase difference betwe... | cond-mat_other |
Bright-Dark Soliton Complexes in Spinor Bose-Einstein Condensates: We present bright-dark vector solitons in quasi-one-dimensional spinor (F=1)
Bose-Einstein condensates. Using a multiscale expansion technique, we reduce
the corresponding nonintegrable system of three coupled Gross-Pitaevskii
equations (GPEs) to a comp... | cond-mat_other |
Casimir-like force arising from quantum fluctuations in a slow-moving
dilute Bose-Einstein condensate: We calculate a force due to zero-temperature quantum fluctuations on a
stationary object in a moving superfluid flow. We model the object by a
localized potential varying only in the flow direction and model the flo... | cond-mat_other |
Equation of state of an interacting Bose gas at finite temperature: a
Path Integral Monte Carlo study: By using exact Path Integral Monte Carlo methods we calculate the equation of
state of an interacting Bose gas as a function of temperature both below and
above the superfluid transition. The universal character of ... | cond-mat_other |
Self-localized impurities embedded in a one dimensional Bose-Einstein
condensate and their quantum fluctuations: We consider the self-localization of neutral impurity atoms in a
Bose-Einstein condensate in a 1D model. Within the strong coupling approach, we
show that the self-localized state exhibits parametric solit... | cond-mat_other |
Fundamental limits to nonlinear energy harvesting: Ease of miniaturization, and less or no maintenance, among other advantages,
have pushed towards replacement of conventional batteries with energy
harvesters in particular, vibratory energy harvesters. In the recent years,
nonlinearity has been intentionally introduced... | cond-mat_other |
Dynamics of kicked matter-wave solitons in an optical lattice: We investigate effects of the application of a kick to one-dimensional
matter-wave solitons in a self-attractive Bose-Einstein condensate trapped in a
optical lattice. The resulting soliton's dynamics is studied within the
framework of the time-dependent no... | cond-mat_other |
Construction of localized atomic wave packets: It is shown that highly localized solitons can be created in lower
dimensional Bose-Einstein condensates (BEC), trapped in a regular harmonic
trap, by temporally varying the trap frequency. A BEC trapped in such a trap
can be effectively used to construct a pulsed atomic l... | cond-mat_other |
Evidence of Luttinger liquid behavior in one-dimensional dipolar quantum
gases: The ground state and structure of a one-dimensional Bose gas with dipolar
repulsions is investigated at zero temperature by a combined Reptation Quantum
Monte Carlo (RQMC) and bosonization approach. A non trivial Luttinger-liquid
behavior... | cond-mat_other |
Symmetry-Protected Topological relationship between $SU(3)$ and
$SU(2)\times{U(1)}$ in Two Dimension: Symmetry-protected topological $\left(SPT\right)$ phases are gapped
short-range entangled states with symmetry $G$, which can be systematically
described by group cohomology theory. $SU(3)$ and $SU(2)\times{U(1)}$ ar... | cond-mat_other |
X-ray Studies of Structure and Defects in Solid 4He from 50 mK to
Melting: Recent measurements have found non-classical rotational inertia (NCRI) in
solid 4He starting at T ~ 200 mK, leading to speculation that a supersolid
state may exist in these materials. Differences in the NCRI fraction due to the
growth method ... | cond-mat_other |
Quantum fluctuation-induced uniaxial and biaxial spin nematics: It is shown that zero point quantum fluctuations (ZPQFs) completely lift the
accidental continuous degeneracy that is found in mean field analysis of
quantum spin nematic phases of hyperfine spin 2 cold atoms. The result is two
distinct ground states which... | cond-mat_other |
Volume element structure and roton-maxon-phonon excitations in
superfluid helium beyond the Gross-Pitaevskii approximation: We propose a theory which deals with the structure and interactions of volume
elements in liquid helium II. The approach consists of two nested models linked
via parametric space. The short-wave... | cond-mat_other |
Rotating quantum turbulence in superfluid 4He in the T=0 limit: Observations of quantum turbulence in pure superfluid 4He in a rotating
container are reported. New techniques of large-scale forcing (rotational
oscillations of the cubic container) and detecting (monitoring ion transport
along the axis of rotation) turbu... | cond-mat_other |
The growth of a Super Stable Heap : an experimental and numerical study: We report experimental and numerical results on the growth of a super stable
heap (SSH). Such a regime appears for flows in a thin channel and for high flow
rate : the flow occurs atop a nearly static heap whose angle is stabilized by
the flowing ... | cond-mat_other |
Correlation of the angular dependence of spin-transfer torque and giant
magnetoresistance in the limit of diffusive transport in spin valves: Angular variation of giant magnetoresistance and spin-transfer torque in
metallic spin-valve heterostructures is analyzed theoretically in the limit of
diffusive transport. It ... | cond-mat_other |
Basis-Independent Spectral Methods for Non-linear Optical Response in
Arbitrary Tight-binding Models: In this paper, we developed a basis-independent perturbative method for
calculating the non-linear optical response of arbitrary non-interacting
tight-binding models. Our method is based on the non-equilibrium Keldys... | cond-mat_other |
Effective thermodynamics of strongly coupled qubits: Interactions between a quantum system and its environment at low temperatures
can lead to violations of thermal laws for the system. The source of these
violations is the entanglement between system and environment, which prevents
the system from entering into a ther... | cond-mat_other |
Phase separations of bosonic mixtures in optical lattices from
macroscopic to microscopic scales: Mixtures of cold bosonic atoms in optical lattices undergo phase separations
on different length scales with increasing inter-species repulsion. As a
general rule, the stronger the intra-species interactions, the shorter... | cond-mat_other |
Artificial gravitation effect on spin-polarized exciton-polaritons: The pseudospin dynamics of long-living exciton-polaritons in a wedged 2D
cavity has been studied theoretically accounting for the external magnetic
field effect. The cavity width variation plays the role of the artificial
gravitational force acting on ... | cond-mat_other |
Extremal transmission through a microwave photonic crystal and the
observation of edge states in a rectangular Dirac billiard: This article presents experimental results on properties of waves propagating
in an unbounded and a bounded photonic crystal consisting of metallic cylinders
which are arranged in a triangula... | cond-mat_other |
Effective theory for the Goldstone field in the BCS-BEC crossover at T=0: We perform a detailed study of the effective Lagrangian for the Goldstone
mode of a superfluid Fermi gas at zero temperature in the whole BCS-BEC
crossover. By using a derivative expansion of the response functions, we derive
the most general for... | cond-mat_other |
Relaxation of Bose-Einstein Condensates of Magnons in Magneto-Textural
Traps in Superfluid $^3$He-B: In superfluid $^3$He-B externally pumped quantized spin-wave excitations or
magnons spontaneously form a Bose-Einstein condensate in a 3-dimensional trap
created with the order-parameter texture and a shallow minimum ... | cond-mat_other |
Stability of Formation of Large Bipolaron: Nonrelativistic Quantum Field
Theory: We are concerned with the stability of formation of large bipolaron in a
3-dimensional (3D) crystal. This problem is considered in the framework of
nonrelativistic quantum field theory. Thus, the Hamiltonian formalism, as
Froehlich intro... | cond-mat_other |
Proposed definitions of the correlation energy density from a
Hartree-Fock starting point: The two-electron Moshinsky model atom as an
exactly solvable model: In both molecular physics and condensed matter theory, deeper understanding
of the correlation energy density epsilon_c (r) remains a high priority. By
adopt... | cond-mat_other |
Vortices in Atomic Bose-Einstein Condensates in the Large Gas Parameter
Region: In this work we compare the results of the Gross-Pitaevskii and modified
Gross-Pitaevskii equations with ab initio variational Monte Carlo calculations
for Bose-Einstein condensates of atoms in axially symmetric traps. We examine
both the... | cond-mat_other |
Propagation of thermal excitations in a cluster of vortices in
superfluid 3He-B: We describe the first measurement on Andreev scattering of thermal
excitations from a vortex configuration with known density, spatial extent, and
orientations in 3He-B superfluid. The heat flow from a blackbody radiator in
equilibrium r... | cond-mat_other |
Pekar's Ansatz and the Strong Coupling Problem in Polaron Theory: A detailed consideration is given to the translation-invariant theory of
Tulub polaron constructed without the use of Pekar ansatz. A fundamental result
of the theory is that the value of the polaron energy is lower than that
obtained on the basis of Pek... | cond-mat_other |
Vortex quantum creation and winding number scaling in a quenched spinor
Bose gas: Motivated by a recent experiment, we study non-equilibrium quantum phenomena
taking place in the quench of a spinor Bose-Einstein condensate through the
zero-temperature phase transition separating the polar paramagnetic and planar
ferr... | cond-mat_other |
Fully permanent magnet atom chip for Bose-Einstein condensation: We describe a self-biased, fully permanent magnet atom chip used to study
ultracold atoms and to produce a Bose-Einstein condensate (BEC). The magnetic
trap is loaded efficiently by adiabatic transport of a magnetic trap via the
application of uniform ext... | cond-mat_other |
Bosonic enhancement of spontaneous emission near an interface: We show how the spontaneous emission rate of an excited two-level atom placed
in a trapped Bose-Einstein condensate of ground-state atoms is enhanced by
bosonic stimulation. This stimulation depends on the overlap of the excited
matter-wave packet with the ... | cond-mat_other |
Strong linewidth variation for spin-torque nano-oscillators as a
function of in-plane magnetic field angle: We measure the microwave signals produced by spin-torque-driven magnetization
dynamics in patterned magnetic multilayer devices at room temperature, as a
function of the angle of a magnetic field applied in the... | cond-mat_other |
Calculation of Kapitza resistance with kinetic equation: A new method is introduced for calculation of interfacial thermal resistance
in the case of heat transport through the interface by phonons. A unique
feature of the method is taking into account all the consequences of a
non-equilibrium character of phonon distri... | cond-mat_other |
Bound-to-bound and bound-to-continuum optical transitions in combined
quantum dot - superlattice systems: By combining band gap engineering with the self-organized growth of quantum
dots, we present a scheme of adjusting the mid-infrared absorption properties
to desired energy transitions in quantum dot based photode... | cond-mat_other |
Chiral structures of lander molecules on Cu(100): Supramolecular assemblies of lander molecules (C$_{90}$H$_{98}$) on Cu(100)
are investigated with low-temperature scanning tunneling microscopy. The
energetically most favourable conformation of the adsorbed molecule is found to
exist in two mirror symmetric enantiomers... | cond-mat_other |
Stone-Wales Transformation Paths in Fullerene C60: The mechanisms of formation of a metastable defect isomer of fullerene C60
due to the Stone-Wales transformation are theoretically studied. It is
demonstrated that the paths of the "dynamic" Stone-Wales transformation at a
high sufficient for overcoming potential barri... | cond-mat_other |
Soliton Analysis of the Electro-Optical Response of Blue Bronze: In recent measurements on the charge-density-wave (CDW) conductor blue bronze
(K0.3MoO3), the electro-transmittance and electro-reflectance spectra were
searched for intragap states that could be associated with solitons created by
injection of electrons ... | cond-mat_other |
First-principles investigation of spin polarized conductance in atomic
carbon wire: We analyze spin-dependent energetics and conductance for one dimensional (1D)
atomic carbon wires consisting of terminal magnetic (Co) and interior
nonmagnetic (C) atoms sandwiched between gold electrodes, obtained employing
first-pri... | cond-mat_other |
Tightly bound gap solitons in a Fermi gas: Within the framework of the mean-field-hydrodynamic model of a degenerate
Fermi gas (DFG), we study, by means of numerical methods and variational
approximation (VA), the formation of fundamental gap solitons (FGSs) in a DFG
(or in a BCS superfluid generated by weak interactio... | cond-mat_other |
Quantum viscosity and the Reynolds similitude in quantum liquid He-II: Reynolds similitude, a key concept in hydrodynamics, states that two
phenomena of different length scales with a similar geometry are physically
identical. Flow properties are universally determined in a unified way in terms
of the Reynolds number $... | cond-mat_other |
Resonant Atom-Dimer Relaxation in Ultracold Atoms: Three-body systems with large scattering length display universal phenomena
associated with a discrete scaling symmetry. These phenomena include resonant
enhancement of three-body loss rates when an Efimov three-body resonance is at
the scattering threshold. In particu... | cond-mat_other |
Magneto-optic far-infrared study of Sr$_{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 |
Diffusive Decay of the Vortex Tangle and Kolmogorov turbulence in
quantum fluids: The idea that chaotic set of quantum vortices can mimic classical turbulence,
or at least reproduce many main features, is currently actively being
developed. Appreciating significance of the challenging problem of the
classical turbule... | cond-mat_other |
Measurement and analysis of the Doppler broadened energy spectra of
annihilation gamma radiation originating from clean and adsorbate-covered
surfaces: We present measurements and theoretical modeling demonstrating the capability
of Doppler Broadened annihilation gamma Spectroscopy (DBS) to provide
element-specific... | cond-mat_other |
Three-body Recombination of Lithium-6 Atoms with Large Negative
Scattering Lengths: The 3-body recombination rate at threshold for distinguishable atoms with
large negative pair scattering lengths is calculated in the zero-range
approximation. The only parameters in this limit are the 3 scattering lengths
and the Efi... | cond-mat_other |
Repeating head-on collisions in an optical trap and the evaluation of
spin-dependent interactions among neutral particles: A dynamic process of repeating collisions of a pair of trapped neutral
particles with weak spin-dependent interaction is designed and studied. Related
theoretical derivation and numerical calcula... | cond-mat_other |
Spin excitations in a monolayer scanned by a magnetic tip: Energy dissipation via spin excitations is investigated for a hard
ferromagnetic tip scanning a soft magnetic monolayer. We use the classical
Heisenberg model with Landau-Lifshitz-Gilbert (LLG)-dynamics including a
stochastic field representing finite temperatu... | cond-mat_other |
Generation of mesoscopic superpositions of a binary Bose-Einstein
condensate in a slightly asymmetric double well: A previous publication [Europhysics Letters 78, 10009 (2007)] suggested to
coherently generate mesoscopic superpositions of a two-component Bose-Einstein
condensate in a double well under perfectly symme... | cond-mat_other |
Influence of interface structure on electronic properties and Schottky
barriers in Fe/GaAs magnetic junctions: The electronic and magnetic properties of Fe/GaAs(001) magnetic junctions are
investigated using first-principles density-functional calculations. Abrupt and
intermixed interfaces are considered, and the dep... | cond-mat_other |
Parity-time symmetry breaking in magnetic systems: The understanding of out-of-equilibrium physics, especially dynamic
instabilities and dynamic phase transitions, is one of the major challenges of
contemporary science, spanning the broadest wealth of research areas that range
from quantum optics to living organisms. F... | cond-mat_other |
X-ray imaging of the dynamic magnetic vortex core deformation: Magnetic platelets with a vortex configuration are attracting considerable
attention. The discovery that excitation with small in-plane magnetic fields or
spin polarised currents can switch the polarisation of the vortex core did not
only open the possibili... | cond-mat_other |
Ultracold Molecule Production Via a Resonant Oscillating Magnetic Field: A novel atom-molecule conversion technique has been investigated. Ultracold
85Rb atoms sitting in a DC magnetic field near the 155G Feshbach resonance are
associated by applying a small sinusoidal oscillation to the magnetic field.
There is resona... | cond-mat_other |
Stable and unstable vector dark solitons of coupled nonlinear
Schrödinger equations. Application to two-component Bose-Einstein
condensates: Dynamics of vector dark solitons in two-component Bose-Einstein condensates
is studied within the framework of the coupled one-dimensional nonlinear
Schr\"odinger (NLS) equati... | cond-mat_other |
A strongly interacting Bose gas: Nozières and Schmitt-Rink theory and
beyond: We calculate the critical temperature for Bose-Einstein condensation in a gas
of bosonic atoms across a Feshbach resonance, and show how medium effects at
negative scattering lengths give rise to pairs reminiscent of the ones
responsible fo... | cond-mat_other |
Exploring correlated 1D Bose gases from the superfluid to the
Mott-insulator state by inelastic light scattering: We report the Bragg spectroscopy of interacting one-dimensional Bose gases
loaded in optical lattices across the superfluid to Mott-insulator phase
transition. Elementary excitations are created with a no... | cond-mat_other |
Modeling of a Cantilever-Based Near-Field Scanning Microwave Microscope: We present a detailed modeling and characterization of our scalable microwave
nanoprobe, which is a micro-fabricated cantilever-based scanning microwave
probe with separated excitation and sensing electrodes. Using finite-element
analysis, the tip... | cond-mat_other |
Universal Relations of Energy Flow, Acoustic Spin and Torque for
Near-Field Acoustic Tweezers: Acoustic spin, radiation torque, energy flow, and reactive power are of
significant importance from both fundamental and practical aspects, responsible
for flexible tweezer manipulations and near-field sound directionality.... | cond-mat_other |
Quantum control and entanglement using periodic driving fields: We propose a scheme for producing directed motion in a lattice system by
applying a periodic driving potential. By controlling the dynamics by means of
the effect known as coherent destruction of tunneling, we demonstrate a novel
ratchet-like effect that e... | cond-mat_other |
Quantum depletion of collapsing Bose-Einstein condensates: We perform the first numerical three-dimensional studies of quantum field
effects in the Bosenova experiment on collapsing condensates by E. Donley et
al. [Nature 415, 39 (2002)] using the exact experimental geometry. In a
stochastic truncated Wigner simulation... | cond-mat_other |
Superfluid behavior of quasi-1D p-H$_2$ inside carbon nanotube: We perform ab-initio Quantum Monte Carlo simulations of para-hydrogen
(pH$_2$) at $T=0$ K confined in carbon nanotubes (CNT) of different radii. The
radial density profiles show a strong layering of the pH$_2$ molecules which
grow, with increasing number o... | cond-mat_other |
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