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Electromagnetically induced transparency in an atom-molecule
Bose-Einstein condensate: We propose a new measurement scheme for the atom-molecule dark state by using
electromagnetically induced transparency (EIT) technique. Based on a
density-matrix formalism, we calculate the absorption coefficient numerically.
The a... | cond-mat_other |
A Complex Chemical Potential: Signature of Decay in a Bose-Einstein
Condensate: We explore the zero-temperature statics of an atomic Bose-Einstein condensate
in which a Feshbach resonance creates a coupling to a second condensate
component of quasi-bound molecules. Using a variational procedure to find the
equation o... | cond-mat_other |
Analysis of patterns formed by two-component diffusion limited
aggregation: We consider diffusion limited aggregation of particles of two different
kinds. It is assumed that a particle of one kind may adhere only to another
particle of the same kind. The particles aggregate on a linear substrate which
consists of per... | cond-mat_other |
Quantization scheme of surface plasma polariton in helical liquid and
the exchanging interaction between quasi particles and emitters: The collective modes of helical electron gases interacting with light have
been studied in an extended random phase approximation. By separating two kinds
of electron density oscillat... | cond-mat_other |
Evidence that rotons in helium II are interstitial atoms: Superfluid helium II contains excitations known as rotons. Their properties
have been studied experimentally for more than 70 years but their structure is
not fully understood. Feynman's 1954 description, involving rotating flow
patterns, does not fully explain ... | cond-mat_other |
Combining high pressure and coherent diffraction: a first feasibility
test: We present a first experiment combining high pression and coherent X-ray
diffraction. By using a dedicated diamond anvil cell, we show that the degree
of coherence of the X-ray beam is preserved when the X-ray beam passes through
the diamond ... | cond-mat_other |
Crossover in Broad Feshbach Resonance with Energy-Dependent Coupling: This paper has been withdrawn by the authors as the recent measurement of the
closed channel population for Li6 [Partridge et al., cond-mat/0505353]
indicates that the cutoff energy is still much larger than any other relevant
energy scales for this ... | cond-mat_other |
Bipartite Yule Processes in Collections of Journal Papers: Collections of journal papers, often referred to as 'citation networks', can
be modeled as a collection of coupled bipartite networks which tend to exhibit
linear growth and preferential attachment as papers are added to the
collection. Assuming primary nodes i... | cond-mat_other |
Structural Study of Adsorbed Helium Films: New Approach with Synchrotron
Radiation X-rays: A few atomic layers of helium adsorbed on graphite have been attracting much
attention as one of the ideal quantum systems in two dimension. Although
previous reports on neutron diffraction have shown fundamental structural
inf... | cond-mat_other |
Kolmogorov spectrum of superfluid turbulence: numerical analysis of the
Gross-Pitaevskii equation with the small scale dissipation: The energy spectrum of superfluid turbulence is studied numerically by
solving the Gross-Pitaevskii equation. We introduce the dissipation term which
works only in the scale smaller than... | cond-mat_other |
Spectroscopy, upconversion dynamics, and applications of Er3+-doped
low-phonon materials: In this work I summarize some of the recent work carried out by our group on
the upconversion dynamics of Er3+-doped potassium lead halide crystals, which
possess very small phonons and present very efficient blue and green
upco... | cond-mat_other |
Digital Processing in Tunneling Spectroscopy: An alternative approach to detect very weak singularities on the
characteristics of a tunnel diode is proposed in which the numerical
differential filtering is applied directly to measured current versus voltage
dependence instead of the modulation technique commonly used w... | cond-mat_other |
Phonon-Induced Quantum Magnetic Deflagration in Mn12: A comprehensive set of experiments on the effect of high-frequency surface
acoustic waves, SAWs, in the spin relaxation in Mn12-acetate is presented. We
have studied the quantum magnetic deflagration induced by SAWs under various
experimental conditions extending th... | 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 |
Distortion of the Stoner-Wohlfarth astroid by a spin-polarized current: The Stoner-Wohlfarth astroid is a fundamental object in magnetism. It
separates regions of the magnetic field space with two stable magnetization
equilibria from those with only one stable equilibrium and it characterizes the
magnetization reversal... | cond-mat_other |
Phase Space Wannier Functions in Electronic Structure Calculations: We consider the applicability of phase space Wannier functions" to electronic
structure calculations. These generalized Wannier functions are analogous to
localized plane waves and constitute a complete, orthonormal set which is
exponentially localized... | cond-mat_other |
Adiabatic quenches through an extended quantum critical region: By gradually changing the degree of the anisotropy in a XXZ chain we study
the defect formation in a quantum system that crosses an extended critical
region. We discuss two qualitatively different cases of quenches, from the
antiferromagnetic to the ferrom... | cond-mat_other |
Barrier crossing to the small Holstein polaron regime: We investigate the dimensionality effects of the Holstein polaron from the
fully quantum regime, where the crossover between large and small polaron
solutions is known to be continuous in all dimensions, into the limit described
by the semiclassical Discrete Nonlin... | cond-mat_other |
Simulating hyperbolic space on a circuit board: The Laplace operator encodes the behavior of physical systems at vastly
different scales, describing heat flow, fluids, as well as electric,
gravitational, and quantum fields. A key input for the Laplace equation is the
curvature of space. Here we discuss and experimental... | cond-mat_other |
Quantum Monte-Carlo study of a two-species boson Hubbard model: We consider a two-species hard-core boson Hubbard model for a supersolid,
where the two types of bosons represent vacancies and interstitials doped into
a commensurate crystal. The on-site inter-species interaction may create bound
states of vacancies and ... | cond-mat_other |
From a nonlinear string to a weakly interacting Bose gas: We investigate a real scalar field whose dynamics is governed by a nonlinear
wave equation. We show that classical description can be applied to a quantum
system of many interacting bosons provided that some quantum ingredients are
included. An universal action ... | cond-mat_other |
Magnetic levitation induced by negative permeability: In this paper we study the interaction between a point magnetic dipole and a
semi-infinite metamaterial using the method of images. We obtain analytical
expressions for the levitation force for an arbitrarily oriented dipole.
Surprisingly the maximal levitation forc... | cond-mat_other |
Ground state of two electrons on concentric spheres: We extend our analysis of two electrons on a sphere [Phys. Rev. A {\bf 79},
062517 (2009); Phys. Rev. Lett. {\bf 103}, 123008 (2009)] to electrons on
concentric spheres with different radii. The strengths and weaknesses of
several electronic structure models are anal... | cond-mat_other |
Magnetization and specific heat of TbFe3(BO3)4: Experiment and crystal
field calculations: We have studied the thermodynamic properties of single-crystalline
TbFe3(BO3)4. Magnetization measurements have been carried out as a function of
magnetic field (up to 50 T) and temperature up to 350K with the magnetic field
bo... | cond-mat_other |
Correlation effects on the static structure factor of a Bose gas: A theoretical treatment of the static structure factor $S(k)$ of a Bose gas
is attempted. The low order expansion theory is implemented for the
construction of the two body density distribution, while various trial
functions for the radial distribution f... | cond-mat_other |
Study of the Magnetic Film Materials by Horizontal Scanning Mode for the
Magnetic Force Microscopy in Magnetostatic and ac Regimes: The magnetic force microscopy inverse problem for the case of horizontal
scanning of a tip on a linear magnetic film is introduced. We show the
possibility to recover the magnetic permea... | cond-mat_other |
Exciton BCS or BEC state in a semiconductor bilayer system?: We calculate the off-diagonal long range order (ODLRO) terms of the
exciton--exciton correlation function of a semiconductor bilayer system with
Coulomb interaction and a transverse magnetic field. We show that the formation
of a BEC state is very sensitive t... | cond-mat_other |
Photoluminescence Spectroscopy of the Molecular Biexciton in Vertically
Stacked Quantum Dot Pairs: We present photoluminescence studies of the molecular neutral
biexciton-exciton spectra of individual vertically stacked InAs/GaAs quantum
dot pairs. We tune either the hole or the electron levels of the two dots into
t... | cond-mat_other |
Conversion Efficiencies of Heteronuclear Feshbach Molecules: We study the conversion efficiency of heteronuclear Feshbach molecules in
population imbalanced atomic gases formed by ramping the magnetic field
adiabatically. We extend the recent work [J. E. Williams et al., New J. Phys.,
8, 150 (2006)] on the theory of Fe... | cond-mat_other |
Frustration of Decoherence in Open Quantum Systems: We study a model of frustration of decoherence in an open quantum system.
Contrary to other dissipative ohmic impurity models, such as the Kondo model or
the dissipative two-level system, the impurity model discussed here never
presents overdamped dynamics even for st... | cond-mat_other |
Floquet system, Bloch oscillation, and Stark ladder: We prove the multi-band Bloch oscillation and Stark ladder in the $nk$ and
site representation from the Floquet theorem. The proof is also possible from
the equivalence between the Floquet system, Bloch oscillation, and the rotator
with spin. We also exactly solve th... | cond-mat_other |
Precise determination of $^6$Li cold collision parameters by
radio-frequency spectroscopy on weakly bound molecules: We employ radio-frequency spectroscopy on weakly bound $^6$Li$_2$ molecules
to precisely determine the molecular binding energies and the energy splittings
between molecular states for different magnet... | cond-mat_other |
Spin dynamics triggered by sub-terahertz magnetic field pulses: Current pulses of up to 20 A and as short as 3 ps are generated by a low
temperature grown GaAs (lt-GaAs) photoconductive switch and guided through a
coplanar waveguide, resulting in a 0.6 Tesla terahertz (THz) magnetic field
pulse. The pulse length is dir... | cond-mat_other |
The Dynamic Structure Factor of the 1D Bose Gas near the Tonks-Girardeau
Limit: While the 1D Bose gas appears to exhibit superfluid response under certain
conditions, it fails the Landau criterion according to the elementary
excitation spectrum calculated by Lieb. The apparent riddle is solved by
calculating the dyna... | cond-mat_other |
The Ginzburg-Landau model of Bose-Einstein condensation of magnons: We introduce a system of phenomenological equations for Bose-Einstein
condensates of magnons in the one-dimensional setting. The nonlinearly coupled
equations, written for amplitudes of the right-and left-traveling waves,
combine basic features of the ... | cond-mat_other |
Fermions at unitarity and Haldane Exclusion Statistics: We consider a gas of neutral fermionic atoms at ultra-low temperatures, with
the attractive interaction tuned to Feshbach resonance. We calculate, the
variation of the chemical potential and the energy per particle as a function
of temperature by assuming the syst... | cond-mat_other |
A Simple Experimental Setup for Simultaneous Superfluid-response and
Heat-capacity Measurements for Helium in Confined Geometries: Torsional oscillator (TO) is an experimental technique which is widely used
to investigate superfluid responses in helium systems confined in porous
materials or adsorbed on substrates. I... | cond-mat_other |
Examining electron-boson coupling using time-resolved spectroscopy: Nonequilibrium pump-probe time domain spectroscopies can become an important
tool to disentangle degrees of freedom whose coupling leads to broad structures
in the frequency domain. Here, using the time-resolved solution of a model
photoexcited electro... | cond-mat_other |
Scaling law for seismic hazard after a main shock: After a large earthquake, the likelihood of successive strong aftershocks
needs to be estimated. Exploiting similarities with critical phenomena, we
introduce a scaling law for the decay in time following a main shock of the
expected number of aftershocks greater than ... | cond-mat_other |
Artificial electromagnetism for neutral atoms: Escher staircase and
Laughlin liquids: We show how lasers may create fields which couple to neutral atoms in the
same way that the electromagnetic fields couple to charged particles. These
fields are needed for using neutral atoms as an analog quantum computer for
simula... | cond-mat_other |
Potential and charge-carrier concentration distributions in solid
electrolyte between flat electrodes: Statistically studied are the equilibrium characteristics of a subsystem of
mobile charges of one sort, taking into account the subsystem of fixed charges
of the opposite sign creating a compensating electric backgr... | cond-mat_other |
Reptation quantum Monte Carlo for lattice Hamiltonians with a
directed-update scheme: We provide an extension to lattice systems of the reptation quantum Monte
Carlo algorithm, originally devised for continuous Hamiltonians. For systems
affected by the sign problem, a method to systematically improve upon the
so-call... | cond-mat_other |
Proximity Effects in Radiative Transfer: Though the dependence of near-field radiative transfer on the gap between two
planar objects is well understood, that between curved objects is still
unclear. We show, based on the analysis of the surface polariton mediated
radiative transfer between two spheres of equal radii $... | cond-mat_other |
Manifestations of the Efimov Effect for Three Identical Bosons: In this paper we present results from numerical calculations for three
identical boson systems for both very large and infinite two-body s-wave
scattering length $a$. We have considered scattering lengths up to $2\times
10^5$ a.u. and solved the hyperangul... | cond-mat_other |
Breeding and Solitary Wave Behavior of Dunes: Beautiful dune patterns can be found in deserts and along coasts due to the
instability of a plain sheet of sand under the action of the wind. Barchan
dunes are highly mobile aeolian dunes found in areas of low sand availability
and unidirectional wind fields. Up to now mod... | cond-mat_other |
Slit-array transmission loss feasibility in airborne sound: Recent experiments conducted in water at ultrasonic frequencies showed the
possibility of overcoming the transmission loss provided by homogeneous plates
at certain frequencies by drilling periodically distributed holes on it. In
this letter, the feasibility o... | cond-mat_other |
Spin-correlation functions in ultracold paired atomic-fermion systems:
sum rules, self-consistent approximations, and mean fields: The spin response functions measured in multi-component fermion gases by
means of rf transitions between hyperfine states are strongly constrained by
the symmetry of the interatomic inter... | cond-mat_other |
Quasimodes of a chaotic elastic cavity with increasing local losses: We report non-invasive measurements of the complex field of elastic
quasimodes of a silicon wafer with chaotic shape. The amplitude and phase
spatial distribution of the flexural modes are directly obtained by Fourier
transform of time measurements. W... | cond-mat_other |
Ultrafast optical Faraday effect in transparent solids: We predict a strong-field ultrafast optical Faraday effect, where a
circularly polarized ultrashort optical pulse induces transient chirality in an
achiral transparent dielectric. This effect is attractive for time-resolved
measurements because it gives access to ... | cond-mat_other |
Finite-Temperature Behavior of an Inter-species Fermionic Superfluid
with Population Imbalance: We determine the superfluid transition temperature $T_c$ and related finite
temperature phase diagrams for the entire BCS-Bose Einstein condensation
crossover in a homogeneous mixture of $^{6}$Li and $^{40}$K atoms with
po... | cond-mat_other |
Effective single-particle order-N scheme for the dynamics of open
non-interacting many-body systems: Quantum master equations are common tools to describe the dynamics of
many-body systems open to an environment. Due to the interaction with the
latter, even for the case of non-interacting electrons, the computational... | cond-mat_other |
Theory of vortex-lattice melting in a one-dimensional optical lattice: We investigate quantum and temperature fluctuations of a vortex lattice in a
one-dimensional optical lattice. We discuss in particular the Bloch bands of
the Tkachenko modes and calculate the correlation function of the vortex
positions along the di... | cond-mat_other |
A generalised Landau-Lifshitz equation for isotropic SU(3) magnet: In the paper we obtain equations for large-scale fluctuations of the mean
field (the field of magnetization and quadrupole moments) in a magnetic system
realized by a square (cubic) lattice of atoms with spin s >= 1 at each site. We
use the generalized ... | cond-mat_other |
Magneto and ferroelectric phase transitions in HoMn2O5 monocrystals: From the physical point of view multiferroics present an extremely
interesting class of systems and problems. These are essentially of two kinds.
One is what are the microscopic conditions, and sometimes constrains, which
determine the possibility to ... | cond-mat_other |
Density-density functionals and effective potentials in many-body
electronic structure calculations: We demonstrate the existence of different density-density functionals
designed to retain selected properties of the many-body ground state in a
non-interacting solution starting from the standard density functional th... | cond-mat_other |
Coherent Destruction of Photon Emission from a Single Molecule Source: A
Renormalization Group Approach: The photon emission from a single molecule driven simultaneously by a laser
and a slow electric radio frequency (rf) field is studied. We use a
non-Hermitian Hamiltonian approach which accounts for the radiative d... | cond-mat_other |
Coherent Control of Rydberg States in Silicon: We demonstrate coherent control of donor wavefunctions in phosphorous-doped
silicon. Our experiments take advantage of a free electron laser to stimulate
and observe photon echoes from, and Rabi oscillations between the ground and
first excited state of P donors in Si. | cond-mat_other |
Comparison study of DFA and DMA methods in analysis of autocorrelations
in time series: Statistics of the Hurst scaling exponents calculated with the use of two
methods: recently introduced Detrended Moving Average Analysis(DMA) and
Detrended Fluctuation Analysis (DFA)are compared. Analysis is done for
artificial sto... | cond-mat_other |
Photoacoustic ultrasound sources from diffusion-limited aggregates: Metallic diffusion-limited aggregate (DLA) films are well-known to exhibit
near-perfect broadband optical absorption. We demonstrate that such films also
manifest a substantial and relatively material-independent photoacoustic
response, as a consequenc... | cond-mat_other |
Anomalous quantum mass flow of atoms in p-wave resonance: I analyze an atomic Fermi gas with a planar p-wave interaction, motivated by
the experimentally observed anisotropy in p-wave Feshbach resonances. An axial
superfluid state is verified. A domain wall object is discovered to be a new
topological defect of this su... | cond-mat_other |
Yukawa bosons in two-dimensional Harmonic confinement: The ground state property of Yukawa Bose fluid confined in a radial harmonic
trap is studied. The calculation was carried out using the density functional
theory formalism within the Kohn-Sham scheme. The excess-correlation energy for
this inhomogeneous fluid is ap... | cond-mat_other |
Inverse Borrmann effect in photonic crystals: The Borrmann effect, which is related to the microscopic distribution of the
electromagnetic field inside the primitive cell, is studied in photonic and
magnetophotonic crystals. This effect, well-known in x-ray spectroscopy, is
responsible for the enhancement or suppressio... | cond-mat_other |
Theory of Magnetodynamics Induced by Spin Torque in Perpendicularly
Magnetized Thin Films: A nonlinear model of spin wave excitation using a point contact in a thin
ferromagnetic film is introduced. Large-amplitude magnetic solitary waves are
computed, which help explain recent spin-torque experiments. Numerical
simu... | cond-mat_other |
Magnetic vortices induced by a moving tip: A two-dimensional easy-plane ferromagnetic substrate, interacting with a
dipolar tip which is magnetised perpendicular with respect to the easy plane is
studied numerically by solving the Landau-Lifshitz Gilbert equation. Due to the
symmetry of the dipolar field of the tip, in... | cond-mat_other |
Harmonic oscillator model for current- and field-driven magnetic
vortices: In experiments the distinction between spin-torque and Oersted-field driven
magnetization dynamics is still an open problem. Here, the gyroscopic motion of
current- and field-driven magnetic vortices in small thin-film elements is
investigated... | cond-mat_other |
Simulating hyperbolic space on a circuit board: The Laplace operator encodes the behavior of physical systems at vastly
different scales, describing heat flow, fluids, as well as electric,
gravitational, and quantum fields. A key input for the Laplace equation is the
curvature of space. Here we discuss and experimental... | cond-mat_other |
Fluctuation spectroscopy of surface melting of ice without, and with
impurities: Water, in its three phases, is ubiquitous, and the surface properties of ice
is important to clarifying the process of melting, as well as to various other
fields, including geophysics. As such, the subject has been studied both
theoreti... | cond-mat_other |
Intense slow beams of bosonic potassium isotopes: We report on an experimental realization of a two-dimensional magneto-optical
trap (2D-MOT) that allows the generation of cold atomic beams of 39K and 41K
bosonic potassium isotopes. The high measured fluxes up to 1.0x10^11 atoms/s
and low atomic velocities around 33 m/... | cond-mat_other |
Collective excitations of trapped Fermi or Bose gases: A new method is developed to calculate all excitations of trapped gases using
hydrodynamics at zero temperature for any equation of state $\mu=\mu(n)$ and
for any trapping potential. It is shown that a natural scalar product can be
defined for the mode functions, b... | cond-mat_other |
Detecting the tunneling rates for strongly interacting fermions on
optical lattices: Strongly interacting fermionic atoms on optical lattices are studied through
a Hubbard-like model Hamiltonian, in which tunneling rates of atoms and
molecules between neighboring sites are assumed to be different. In the limit
of lar... | cond-mat_other |
Disordered Supersolids in the Extended Bose-Hubbard Model: The extended Bose-Hubbard model captures the essential properties of a wide
variety of physical systems including ultracold atoms and molecules in optical
lattices, Josephson junction arrays, and certain narrow band superconductors.
It exhibits a rich phase dia... | cond-mat_other |
Vortex shedding from a microsphere oscillating in superfluid ^4He at mK
temperatures and from a laser beam moving in a Bose-Einstein condensate: Turbulent drag of an oscillating microsphere, that is levitating in
superfluid $^4$He at mK temperatures, is unstable slightly above a critical
velocity amplitude $v_c$. The... | cond-mat_other |
Ultrafast amplification and non-linear magneto-elastic coupling of
coherent magnon modes in an antiferromagnet: We investigate the role of domain walls in the ultrafast magnon dynamics of
an antiferromagnetic NiO single crystal in a pump-probe experiment with
variable pump photon energy. Analysing the amplitude of th... | cond-mat_other |
Quasiclassical frustration: We study the dissipative properties of a harmonic oscillator subject to two
independent heat baths, one of which couples to its position and the other one
to its momentum. This model describes a large spin impurity in a ferromagnet.
We find that some effects of the two heat baths partially c... | cond-mat_other |
Fermion mediated long-range interactions of bosons in the 1D
Bose-Fermi-Hubbard model: The ground-state phase diagram of mixtures of spin polarized fermions and
bosons in a 1D periodic lattice is discussed in the limit of large fermion
hopping and half filling of the fermions. Numerical simulations performed with
the... | cond-mat_other |
Old wine in new bottles: Onsager's reciprocity relations for the coefficients of transport equations
are now 87 years old. Sometimes these relations are called the Fourth Law of
Thermodynamics. Among others they provide an effective criterion for the
existence of local equilibrium and of microscopic reversibility. Sinc... | cond-mat_other |
Infinite average lifetime of an unstable bright state in the green
fluorescent protein: The time evolution of the fluorescence intensity emitted by well-defined
ensembles of Green Fluorescent Proteins has been studied by using a standard
confocal microscope. In contrast with previous results obtained in single
molecu... | cond-mat_other |
Su(3) Algebraic Structure of the Cuprate Superconductors Model based on
the Analogy with Atomic Nuclei: A cuprate superconductor model based on the analogy with atomic nuclei was
shown by Iachello to have an $su(3)$ structure. The mean-field approximation
Hamiltonian can be written as a linear function of the generat... | 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 |
A Computational Study of Rotating Spiral Waves and Spatio-Temporal
Transient Chaos in a Deterministic Three-Level Active System: Spatio-temporal dynamics of a deterministic three-level cellular automaton
(TLCA) of Zykov-Mikhailov type (Sov. Phys. - Dokl., 1986, Vol.31, No.1, P.51)
is studied numerically. Evolution of... | cond-mat_other |
Dynamical Exchange Interaction From Time-Dependent Spin Density
Functional Theory: We report on {\it ab initio} time-dependent spin dynamics simulations for a
two-center magnetic molecular complex based on time-dependent non-collinear
spin density functional theory. In particular, we discuss how the dynamical
behavio... | cond-mat_other |
Probing pairing gap in Fermi atoms by light scattering: We study stimulated scattering of polarized light in a two-component Fermi
gas of atoms at zero temperature. Within the framework of Nambu-Gorkov
formalism, we calculate the response function of superfluid gas taking into
account the final state interactions. The ... | cond-mat_other |
Absorbing photonic crystals for thin film photovoltaics: The absorption of thin hydrogenated amorphous silicon layers can be
efficiently enhanced through a controlled periodic patterning. Light is trapped
through coupling with photonic Bloch modes of the periodic structures, which
act as an absorbing planar photonic cr... | cond-mat_other |
Nonlinear Landau-Zener Processes in a Periodic Driving Field: Effects of a periodic driving field on Landau-Zener processes are studied
using a nonlinear two-mode model that describes the mean-field dynamics of a
many-body system. A variety of different dynamical phenomena in different
parameter regimes of the driving ... | cond-mat_other |
Collisional and molecular spectroscopy in an ultracold Bose-Bose mixture: The route toward a Bose-Einstein condensate of dipolar molecules requires the
ability to efficiently associate dimers of different chemical species and
transfer them to the stable rovibrational ground state. Here, we report on
recent spectroscopi... | cond-mat_other |
Parametrically excited "Scars" in Bose-Einstein condensates: Parametric excitation of a Bose-Einstein condensate (BEC) can be realized by
periodically changing the interaction strength between the atoms. Above some
threshold strength, this excitation modulates the condensate density. We show
that when the condensate is... | cond-mat_other |
Condensation of phonons in an ultracold Bose gas: We consider the generation of longitudinal phonons in an elongated
Bose-condensed gas at zero temperature due to parametric resonance as a result
of the modulation of the transverse trap frequency. The nonlinear temporal
evolution with account of the phonon-phonon inter... | cond-mat_other |
Diagnostics for the ground state phase of a spin-2 Bose-Einstein
condensate: We propose a method to determine the singlet-pair energy of a spin-2
Bose-Einstein condensate (BEC). By preparing the initial populations in the
magnetic sublevels 0, 2, -2 with appropriate relative phases, we can obtain the
coefficient of t... | cond-mat_other |
The strong form of the Levinson theorem for a distorted KP potential: We present a heuristic derivation of the strong form of the Levinson theorem
for one-dimensional quasi-periodic potentials. The particular potential chosen
is a distorted Kronig-Penney model. This theorem relates the phase shifts of
the states at eac... | cond-mat_other |
Comment on pressure driven flow of superfluid $^4$He through a nanopipe
(Botimer and Taborek 2016): Botimer and Taborek (2016) measured the mass flux of superfluid $^4$He
through a capillary into an evacuated chamber for various temperatures and
pressures of the reservoir chamber. They found a sharp transition from l... | cond-mat_other |
CHEERS: A tool for Correlated Hole-Electron Evolution from Real-time
Simulations: We put forward a practical nonequilibrium Green's function (NEGF) scheme to
perform real-time evolutions of many-body interacting systems driven out of
equilibrium by external fields. CHEERS is a computational tool to solve the
NEGF equ... | cond-mat_other |
Bose-Einstein condensation in an optical lattice: In this paper we develop an analytic expression for the critical temperature
for a gas of ideal bosons in a combined harmonic lattice potential, relevant to
current experiments using optical lattices. We give corrections to the critical
temperature arising from effectiv... | 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 |
Highly sensitive and broadband carbon nanotube radio-frequency
single-electron transistor: We have investigated radio-frequency single-electron transistor (RF-SET)
operation of single-walled carbon nanotube quantum dots in the strong tunneling
regime. At 4.2 K and carrier frequency 754.2 MHz, we reach a charge sensit... | cond-mat_other |
Intrinsic leakage and adsorption currents associated with the
electrocaloric effect in multilayer capacitors: During the last few years, the increasing demand of energy for refrigeration
applications has relived the interest of the scientific community in the study
of alternative methods to the traditional gas-based ... | cond-mat_other |
Quantum effects in the H-bond symmetrization and in the thermodynamic
properties of high pressure ice: We investigate the structural and thermodynamic properties of high-pressure
ice by incorporating quantum anharmonicity at a non-perturbative level. Quantum
fluctuations reduce the critical pressure of the phase tran... | cond-mat_other |
Simplified feedback control system for Scanning Tunneling Microscopy: A Scanning Tunneling Microscope (STM) is one of the most important scanning
probe tools available to study and manipulate matter at the nanoscale. In a
STM, a tip is scanned on top of a surface with a separation of a few \AA.
Often, the tunneling cur... | cond-mat_other |
Observation of an Efimov-like resonance in ultracold atom-dimer
scattering: The field of few-body physics has originally been motivated by understanding
nuclear matter. New model systems to experimentally explore few-body quantum
systems can now be realized in ultracold gases with tunable interactions.
Albeit the vas... | cond-mat_other |
Atoms in boxes: from confined atoms to electron-atom scattering: We show that both confined atoms and electron-atom scattering can be
described by a unified basis set method. The central idea behind this method is
to place the atom inside a hard potential sphere, enforced by a standard Slater
type basis set multiplied ... | cond-mat_other |
Localization by entanglement: We study the localization of bosonic atoms in an optical lattice, which
interact in a spatially confined region. The classical theory predicts that
there is no localization below a threshold value for the strength of
interaction that is inversely proportional to the number of participating... | cond-mat_other |
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