Skip to content

Condensed Matter papers — page 83

cond-matBrowse archive

Vicious Random Walkers and a Discretization of Gaussian Random Matrix Ensembles
The vicious random walker problem on a one dimensional lattice is considered. Many walkers take simultaneous steps on the lattice and the configurations in which two of them arrive at the same site…
Taro Nagao, Peter J. ForresterJul 11, 2001
Learn
Spectral Response of Al/Si Photodiode as IR Sensor
Al/Si photodiode were prepared by successive of deposition of Aluminum thin films on p-type Si (100) using coprecipitation method by evaporator in vacuum 2.0E-4 torr. The measured signals are…
Irzaman, A. Fuad, D. Rusdiana et al.Jul 11, 2001
Learn
Preparation of Bi4ti3o12 Thin Films by a Pulsed Laser Ablation Deposition (PLAD) Method and their Applications for Ultraviole Detectors
Bi4Ti3O12 (BIT) has been considered as material for UV detector since it has optical band gap of about 3.5 eV. Unlike the most used material for this purpose, such as GaN and AlN, BIT is a…
A. Fuad, Darsikin, Irzaman et al.Jul 11, 2001
Learn
Oscillating magnetoresistance in diluted magnetic semiconductor barrier structures
Ballistic spin polarized transport through diluted magnetic semiconductor (DMS) single and double barrier structures is investigated theoretically using a two-component model. The tunneling…
Kai Chang, J. B. Xia, F. M. PeetersJul 10, 2001
Learn
Vortex Nucleation and Array Formation in a Rotating Bose-Einstein Condensate
We study the dynamics of vortex lattice formation of a rotating trapped Bose-Einstein condensate by numerically solving the two-dimensional Gross-Pitaevskii equation, and find that the condensate…
Makoto Tsubota, Kenichi Kasamatsu, Masahito UedaJul 9, 2001
Learn
Violation of Quasineutrality in Semiconductor Transport: The Dember Effect
Exact solution of the linearized equations for steady-state transport in semiconductors yields two modes that vary exponentially in space, one involving screening (without entropy production) and one…
Maja Krčmar, Wayne M. SaslowJul 6, 2001
Learn
Fractal Spin Glass Properties of Low Energy Configurations in the Frenkel-Kontorova chain
We study numerically and analytically the classical one-dimensional Frenkel-Kontorova chain in the regime of pinned phase characterized by phonon gap. Our results show the existence of exponentially…
O. V. Zhirov, G. Casati, D. L. ShepelyanskyJul 6, 2001
Learn
Spontaneous emission of atoms via collisions of Bose-Einstein condensates
The widely used Gross-Pitaevskii equation treats only coherent aspects of the evolution of a Bose-Einstein condensate. However, inevitably some atoms scatter out of the condensate. We have developed…
Radka Bach, Marek Trippenbach, Kazimierz RzazewskiJul 5, 2001
Learn
Propagation of exciton pulses in semiconductors
Using a toy model, we examine the propagation of excitons in Cu2O, which form localized pulses under certain experimental conditions. The formation of these waves is attributed to the effect of…
A. D. Jackson, G. M. KavoulakisJul 5, 2001
Learn
Longitudinal spin transport in diluted magnetic semiconductor superlattices: the effect of the giant Zeeman splitting
Longitudinal spin transport in diluted magnetic semiconductor superlattices is investigated theoretically. The longitudinal magnetoconductivity (MC) in such systems exhibits an oscillating behavior…
Kai Chang, J. B. Xia, F. M. PeetersJul 5, 2001
Learn
Disorder-induced phonon self-energy of semiconductors with binary isotopic composition
Self-energy effects of Raman phonons in isotopically disordered semiconductors are deduced by perturbation theory and compared to experimental data. In contrast to the acoustic frequency region,…
F. Widulle, J. Serrano, M. CardonaJul 5, 2001
Learn
Predictability of Currency Market Exchange
We analyze tick data of yen-dollar exchange with a focus on its up and down movement. We show that there exists a rather particular conditional probability structure with such high frequency data.…
Toru Ohira, Naoya Sazuka, Kouhei Marumo et al.Jul 4, 2001
Learn
Thermal treatment of the minority game
We study a cost function for the aggregate behavior of all the agents involved in the Minority Game (MG) or the Bar Attendance Model (BAM). The cost function allows to define a deterministic,…
E. Burgos, Horacio Ceva, R. P. J. PerazzoJul 4, 2001
Learn
Parametric pumping at finite frequency
We report on a first principles theory for analyzing the parametric electron pump at a finite frequency. The pump is controlled by two pumping parameters with phase difference ϕ. In the zero…
Baigeng Wang, Jian Wang, Hong GuoJul 4, 2001
Learn
Enhancement of parametric pumping due to Andreev reflection
We report properties of parametric electron pumping in the presence of a superconducting lead. Due to a constructive interference between the direct reflection and the multiple Andreev reflection,…
Jian Wang, Yadong Wei, Baigeng Wang et al.Jul 4, 2001
Learn
Atom laser divergence
We measure the angular divergence of a quasi-continuous, rf-outcoupled, free-falling atom laser as a function of the outcoupling frequency. The data is compared to a Gaussian-beam model of laser…
Y. Le Coq, J. H. Thywissen, S. A. Rangwala et al.Jul 2, 2001
Learn
Anomalous Quasiparticle Lifetime in Graphite: Band Structure Effects
We report ab initio calculation of quasiparticle lifetimes in graphite, as determined from the imaginary part of the self-energy operator within the GW aproximation. The inverse lifetime in the…
Catalin D. Spataru, Miguel A. Cazalilla, Angel Rubio et al.Jul 2, 2001
Learn
Quantized vortices in mixed 3He-4He drops
Using density functional theory, we investigate the structure of mixed 3HeN3-4HeN4 droplets with an embedded impurity (Xe atom or HCN molecule) which pins a quantized vortex line.…
Ricardo Mayol, Marti Pi, Manuel Barranco et al.Jul 2, 2001
Learn
Helium nanodroplets and trapped Bose-Einstein condensates as prototypes of finite quantum fluids
Helium nanodroplets and trapped Bose-Einstein condensates in dilute atomic gases offer complementary views of fundamental aspects of quantum many-body systems. We discuss analogies and differences,…
F. Dalfovo, S. StringariJul 2, 2001
Learn
Kink Radiation on Small Discrete Periodic Damped Driven Nonlinear sine-Gordon Arrays
In this paper, we explain the fundamental properties of the radiation processess of untrapped kinks moving on discrete lattices or any spatially periodic potential. In particular we explain…
C. R. WillisJul 2, 2001
Learn
Fluctuations and Market Friction in Financial Trading
We study the relation between stock price changes and the difference in the number of sell and buy orders. Using a soft spin model, we describe the price impact of order imbalances and find an…
Bernd RosenowJul 1, 2001
Learn
Quantum Phases of Vortices in Rotating Bose-Einstein Condensates
We investigate the groundstates of weakly interacting bosons in a rotating trap as a function of the number of bosons, N, and the average number of vortices, NV. We identify the filling fraction…
N. R. Cooper, N. K. Wilkin, J. M. F. GunnJun 30, 2001
Learn
High Pressure Insulator-Metal Transition in Molecular Fluid Oxygen
We report the first experimental evidence for a metallic phase in fluid molecular oxygen. Our electrical conductivity measurements of fluid oxygen under dynamic quasi-isentropic compression show that…
Marina Bastea, Arthur C. Mitchell, William J. NellisJun 30, 2001
Learn
Schwinger-boson calculation for a frustrated antiferromagnet
The application of the Schwinger-boson transformation to quantum Heisenberg magnets is briefly reviewed, beginning with the derivation of a rotationally invariant mean-field theory. The inclusion of…
Michael J. QuistJun 29, 2001
Learn
Full Frequency Back-Action Spectrum of a Single Electron Transistor during Qubit read-out
We calculate the spectral density of voltage fluctuations in a Single Electron Transistor (SET), biased to operate in a transport mode where tunneling events are correlated due to Coulomb…
Goran Johansson, Andreas Kack, Goran WendinJun 29, 2001
Learn
← PreviousPage 83Next →