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Condensed Matter papers — page 66

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Tensile Strength of Carbon Nanotubes under Realistic Temperature and Strain Rate
Strain rate and temperature dependence of the tensile strength of single-walled carbon nanotubes has been investigated with molecular dynamics simulations. The tensile failure or yield strain is…
Chenyu Wei, Kyeongjae Cho, Deepak SrivastavaFeb 27, 2002
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Random-phase approximation study of collective excitations in the Bose-Fermi mixed condensate of alkali-metal gases
We perform Random Phase Approximation (RPA) study of collective excitations in the bose-fermi mixed degenerate gas of Alkali-metal atoms at T=0. The calculation is done by diagonalization in a model…
T. Sogo, T. Miyakawa, T. Suzuki et al.Feb 26, 2002
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Vortex-vortex interactions in toroidally trapped Bose-Einstein condensates
We analyze the vortex dynamics and vortex-vortex interactions in Bose-Einstein condensates confined in toroidal traps. We show that this particular geometry strongly distorts the vortex dynamics. The…
T. Schulte, L. Santos, A. Sanpera et al.Feb 26, 2002
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First-order transition between a small-gap semiconductor and a ferromagnetic metal in the isoelectronic alloys FeSi1-xGex
The contrasting groundstates of isoelectronic and isostructural FeSi and FeGe can be explained within an extended local density approximation scheme (LDA+U) by an appropriate choice of the onsite…
V. I. Anisimov, R. Hlubina, M. A. Korotin et al.Feb 26, 2002
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History-dependent Maximum Static Friction and Rectification of a System with a Few Particles in a Periodic Field
History-dependent maximum static friction is investigated using simple models with two and three particles in one-dimensional periodic potentials. In some situations, these systems possess two values…
A. AwazuFeb 26, 2002
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Contrast Interferometry Using Bose-Einstein Condensates to Measure h/m and the Fine Structure Constant
The kinetic energy of an atom recoiling due to absorption of a photon was measured as a frequency using an interferometric technique called ``contrast interferometry''. Optical standing wave…
S. Gupta, K. Dieckmann, Z. Hadzibabic et al.Feb 25, 2002
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On Kelvin-Helmholtz instability in superfluids
The Kelvin-Helmholtz instability in superfluids is discussed, based on the first experimental observation of such instability at the interface between superfluid 3He-A and superfluid 3He-B…
G. E. VolovikFeb 25, 2002
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Thixotropy in macroscopic suspensions of spheres
An experimental study of the viscosity of a macroscopic suspension, i.e. a suspension for which Brownian motion can be neglected, under steady shear is presented. The suspension is prepared with a…
C. Voeltz, M. Nitschke, L. Heymann et al.Feb 25, 2002
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Magnetic field driven metal-insulator phase transition in planar systems
A theory of the magnetic field driven (semi-)metal-insulator phase transition is developed for planar systems with a low density of carriers and a linear (i.e., relativistic like) dispersion relation…
E. V. Gorbar, V. P. Gusynin, V. A. Miransky et al.Feb 24, 2002
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Phase Diagram of the Extended Hubbard Model with Pair Hopping Interaction
A one-dimensional model of interacting electrons with on-site U, nearest-neighbor V, and pair-hopping interaction W is studied at half-filling using the continuum limit field theory approach.…
G. I. Japaridze, Sujit SarkarFeb 24, 2002
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Sparse random matrices: the eigenvalue spectrum revisited
We revisit the derivation of the density of states of sparse random matrices. We derive a recursion relation that allows one to compute the spectrum of the matrix of incidence for finite trees that…
Guilhem Semerjian, Leticia F. CugliandoloFeb 22, 2002
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Scaling of nano-Schottky-diodes
A generally applicable model is presented to describe the potential barrier shape in ultra small Schottky diodes. It is shown that for diodes smaller than a characteristic length lc (associated…
G. D. J. Smit, S. Rogge, T. M. KlapwijkFeb 22, 2002
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Magnetic properties of SO(5) superconductivity
The distinction between type I and type II superconductivity is re-examined in the context of the SO(5) model recently put forth by Zhang. Whereas in conventional superconductivity only one parameter…
M. Juneau, R. MacKenzie, M. -A. VachonFeb 22, 2002
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Variational Perturbation Theory for Markov Processes
We develop a convergent variational perturbation theory for conditional probability densities of Markov processes. The power of the theory is illustrated by applying it to the diffusion of a particle…
Hagen Kleinert, Axel Pelster, Mihai V. PutzFeb 21, 2002
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Optical RKKY Interaction between Charged Semiconductor Quantum Dots
We show how a spin interaction between electrons localized in neighboring quantum dots can be induced and controlled optically. The coupling is generated via virtual excitation of delocalized…
C. Piermarocchi, Pochung Chen, L. J. Sham et al.Feb 20, 2002
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Tunable Quantum Tunneling of Magnetic Domain Walls
Magnetic domain wall tunneling is observed in the disordered Ising ferromagnet LiHo0.44Y0.56F4. The tunneling can be tuned by applying a magnetic field transverse to the Ising axis, and is…
J. Brooke, T. F. Rosenbaum, G. AeppliFeb 20, 2002
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Topology of the ground state of two interacting Bose-Einstein condensates
We investigate the spatial patterns of the ground state of two interacting Bose-Einstein condensates. We consider the general case of two different atomic species (with different mass and in…
Francesco Riboli, Michele ModugnoFeb 20, 2002
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Quantization of adiabatic pumped charge in the presence of superconducting lead
We investigate the parametric electron pumping of a double barrier structure in the presence of a superconducting lead. The parametric pumping is facilitated by cyclic variation of the barrier…
Jian Wang, Baigeng WangFeb 20, 2002
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Nature of the spin-singlet ground state in CaCuGe2O6
We investigate by means of ab initio electronic structure analysis and Quantum Monte Carlo calculations the scenario where longer-ranged magnetic interactions dominate over short-ranged interactions…
Roser Valenti, T. Saha-Dasgupta, Claudius GrosFeb 19, 2002
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Calculation of the energy spectrum of a two-electron spherical quantum dot
We study the energy spectrum of the two-electron spherical parabolic quantum dot using the exact Schroedinger, the Hartree-Fock, and the Kohn-Sham equations. The results obtained by applying the…
Ramiro Pino, Victor M. VillalbaFeb 19, 2002
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Generating vortex rings in Bose-Einstein condensates in the line-source approximation
We present a numerical method for generating vortex rings in Bose-Einstein condensates confined in axially symmetric traps. The vortex ring is generated using the line-source approximation for the…
M. Guilleumas, D. M. Jezek, R. Mayol et al.Feb 19, 2002
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Option Pricing from Path Integral for Non-Gaussian Fluctuations. Natural Martingale and Application to Truncated Lévy Distributions
Within a path integral formalism for non-Gaussian price fluctuations we set up a simple stochastic calculus and derive a natural martingale for option pricing from the wealth balance of options,…
Hagen KleinertFeb 19, 2002
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Quantum-fluctuation-induced collisions and subsequent excitation gap of an elastic string between walls
An elastic string embedded between rigid walls is simulated by means of the density-matrix renormalization group. The string collides against the walls owing to the quantum-mechanical zero-point…
Yoshihiro NishiyamaFeb 18, 2002
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A theory of viscoelastic nematodynamics
A nonlinear viscoelastic theory of nematodynamic type is developed for nematic liquid crystalline (LC) semi-flexible polymers. A measure of transient elastic strain due to the change in length of…
A. I. Leonov, V. S. VolkovFeb 16, 2002
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Combinatorial interpretation of Haldane-Wu fractional exclusion statistics
Assuming that the maximal allowed number of identical particles in state is an integer parameter, q, we derive the statistical weight and analyze the associated equation which defines the statistical…
A. K. Aringazin, M. I. MazhitovFeb 16, 2002
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