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Condensed Matter papers — page 70

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Ab initio many-body calculations on infinite carbon and boron-nitrogen chains
In this paper we report first-principles calculations on the ground-state electronic structure of two infinite one-dimensional systems: (a) a chain of carbon atoms and (b) a chain of alternating…
Ayjamal Abdurahman, Alok Shukla, Michael DolgJan 7, 2002
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Twist Free Energy
One may impose to a system with spontaneous broken symmetry, boundary conditions which correspond to different pure states at two ends of a sample. For a discrete Ising-like broken symmetry, boundary…
E. Brézin, C. De DominicisJan 7, 2002
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Twist Free Energy in a Spin Glass
The field theory of a short range spin glass with Gaussian random interactions, is considered near the upper critical dimension six. In the glassy phase, replica symmetry breaking is accompanied with…
E. Brézin, C. De DominicisJan 7, 2002
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Sustaining supercooled mixed phase via resonant oscillations of the order parameter
We investigate the dynamics of a first order transition when the order parameter field undergoes resonant oscillations, driven by a periodically varying parameter of the free energy. This parameter…
Rajarshi Ray, Soma Sanyal, Ajit M. SrivastavaJan 6, 2002
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Two-component Bose-Einstein Condensates with Large Number of Vortices
We consider the condensate wavefunction of a rapidly rotating two-component Bose gas with an equal number of particles in each component. If the interactions between like and unlike species are very…
Erich J. Mueller, Tin-Lun HoJan 4, 2002
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Detection and Implications of a Time-reversal breaking state in underdoped Cuprates
We present general symmetry considerations on how a Time-reversal breaking state may be detected by angle-resolved photoemission using circularly polarized photons as has been proposed earlier.…
M. E. Simon, C. M. VarmaJan 3, 2002
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Quantum Melting and Absence of Bose-Einstein Condensation in Two-Dimensional Vortex Matter
We demonstrate that quantum fluctuations suppress Bose-Einstein condensation of quasi-two-dimensional bosons in a rapidly-rotating trap. Our conclusions rest in part on an effective-Lagrangian…
Jairo Sinova, C. B. Hanna, A. H. MacDonaldJan 3, 2002
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Thermal Fluctuations of a Liquid Helium Inside a Spherical Volume
Correlation theory of hydrodynamic fluctuations of a liquid helium II inside a spherical volume is developed.
A. V. Kirilyuk, A. V. ZvelindovskyJan 3, 2002
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Self-Segregation vs. Clustering in the Evolutionary Minority Game
Complex adaptive systems have been the subject of much recent attention. It is by now well-established that members (`agents') tend to self-segregate into opposing groups characterized by extreme…
Shahar Hod, Ehud NakarJan 1, 2002
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Correlation studies of open and closed states fluctuations in an ion channel: Analysis of ion current through a large conductance locust potassium channel
Ion current fluctuations occurring within open and closed states of large conductance locust potassium channel (BK channel) were investigated for the existence of correlation. Both time series,…
Zuzanna Siwy, Marcel Ausloos, Kristinka IvanovaDec 31, 2001
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CPN Solitons in Quantum Hall Systems
We will present here an elementary pedagogical introduction to CPN solitons in quantum Hall systems. We begin with a brief introduction to both CPN models and to quantum Hall (QH) physics. Then…
R. RajaramanDec 29, 2001
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Exactly solvable models through the empty interval method, for more-than-two-site interactions
Single-species reaction-diffusion systems on a one-dimensional lattice are considered, in them more than two neighboring sites interact. Constraints on the interaction rates are obtained, that…
M. Khorrami, A. Aghamohammadi, M. AlimohammadiDec 29, 2001
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Longitudinal spin waves in a dilute Bose gas
We present a kinetic theory for a dilute noncondensed Bose gas of two-level atoms that predicts the transient spin segregation observed in a recent experiment. The underlying mechanism driving spin…
J. E. Williams, T. Nikuni, Charles W. ClarkDec 29, 2001
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High-Frequency Impedance of Driven Superlattices
The complex impedance of a semiconductor superlattice biased into the regime of negative differential conductivity and driven by an additional GHz ac voltage is computed. From a simulation of the…
A. -K. Jappsen, A. Amann, A. Wacker et al.Dec 27, 2001
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Electrodynamics of metallic photonic crystals and problem of left-handed materials
An exact analytical theory of the electromagnetic waves in metallic photonic crystals with a small volume fraction of a metal is presented. It is shown that there are waves with a very low cutoff…
A. L. Pokrovsky, A. L. EfrosDec 26, 2001
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A case study of stratus cloud base height multifractal fluctuations
The complex structure of a typical stratus cloud base height (or profile) time series is analyzed with respect to the variability of its fluctuations and their correlations at all experimentally…
K. Ivanova, H. N. Shirer, E. E. Clothiaux et al.Dec 26, 2001
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Collapse dynamics of trapped Bose-Einstein condensates
We analyze the implosion and subsequent explosion of a trapped condensate after the scattering length is switched to a negative value. Our results compare very well qualitatively and fairly well…
L. Santos, G. V. ShlyapnikovDec 21, 2001
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On the growth of bounded trees
Bounded infinite graphs are defined on the basis of natural physical requirements. When specialized to trees this definition leads to a natural conjecture that the average connectivity dimension of…
Claudio Destri, Luca DonettiDec 20, 2001
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Micromagnetism in URu2Si2 and high temperature superconductors
It has been proposed, that unconventional density waves (UDW) are possible candidates for systems with hidden order parameter. Unlike in conventional density waves, no periodic modulation of either…
A. Virosztek, K. Maki, B. DoraDec 20, 2001
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Inelastic light, neutron, and X-ray scatterings related to the heterogeneous elasticity of glasses
The effects of plasticization of poly(methyl methacrylate) glass on the boson peaks observed by Raman and neutron scattering are compared. In plasticized glass the cohesion heterogeneities are…
E. Duval, L. Saviot, A. Mermet et al.Dec 20, 2001
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Stability of continuously pumped atom lasers
A multimode model of a continuously pumped atom laser is shown to be unstable below a critical value of the scattering length. Above the critical scattering length, the atom laser reaches a steady…
S. A. Haine, J. J. Hope, N. P. Robins et al.Dec 20, 2001
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Novel aspects of spin-polarized transport and spin dynamics
There is a renewed interest to study spin-polarized transport and spin dynamics in various electronic materials. The motivation to examine the spin degrees of freedom (mostly in electrons, but also…
Igor ZuticDec 19, 2001
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Comment on "Unique Translation between Hamiltonian Operators and Functional Integrals"
In a recent letter [PRL 86, 1 (2001)], Gollisch and Wetterich show that a careful treatment of discretization errors in a phase-space path integral formulation of quantum mechanics leads to a…
Michael Weyrauch, Andreas W. SchreiberDec 18, 2001
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Flat branches and pressure amorphization
After summarizing the phenomenology of pressure amorphization (PA), we present a theory of PA based on the notion that one or more branches of the phonon spectrum soften and flatten with increasing…
Morrel H. Cohen, Jorge Iniguez, J. B. NeatonDec 17, 2001
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Continuous quantum measurement of a Bose-Einstein condensate: a stochastic Gross-Pitaevskii equation
We analyze the dynamics of a Bose-Einstein condensate undergoing a continuous dispersive imaging by using a Lindblad operator formalism. Continuous strong measurements drive the condensate out of the…
Diego A. R. Dalvit, Jacek Dziarmaga, Roberto OnofrioDec 17, 2001
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