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Condensed Matter papers — page 55

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Pore Stabilization in Cohesive Granular Systems
Cohesive powders tend to form porous aggregates which can be compacted by applying an external pressure. This process is modelled using the Contact Dynamics method supplemented with a cohesion law…
Dirk Kadau, Guido Bartels, Lothar Brendel et al.Jun 28, 2002
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Limitations on Sub-Diffraction Imaging with a Negative Refractive Index Slab
Recently it has been proposed that a planar slab of material, for which both the permittivity and permeability have the values of -1, could bring not only the propagating fields associated with a…
D. R. Smith, D. Schurig, Marshall Rosenbluth et al.Jun 28, 2002
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Near Field Lenses in Two Dimensions
It has been shown that a slab of materials with refractive index = -1 behaves like a perfect lens focussing all light to an exact electromagnetic copy of an object. The original lens is limited to…
J. B. Pendry, S. Anantha RamakrishnaJun 28, 2002
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Optical gain removes absorption and increases resolution in a near-field lens
A recent paper showed how to construct a lens that focuses near field radiation and hence produce resolution unlimited by wavelength. The prescription requires lossless materials with negative…
S. Anantha Ramakrishna, J. B. PendryJun 28, 2002
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The asymmetric lossy near-perfect lens
We extend the ideas of the recently proposed perfect lens [J.B. Pendry, Phys. Rev. Lett. 85, 3966 (2000)] to an alternative structure. We show that a slab of a medium with negative refractive…
S. Anantha Ramakrishna, J. B. Pendry, D. Schurig et al.Jun 28, 2002
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Comment on "Wave Refraction in Negative-Index Media: Always Positive and Very Inhomogeneous"
In a recent Physical Review Letter [1] Valanju Walser and Valanju (VWV) called into question the basis of work on the so called negative index media (NIM). See for example [2,3]. The key point at…
JB Pendry, D. R. SmithJun 28, 2002
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Comment on "Left-Handed Materials Do Not Make a Perfect Lens"
In a recent Physical Review Letter [1] Garcia and Nieto Vesperinas (GNV) dispute the claim of perfect lensing made in [2]. The thrust of the GVN paper is that the solutions proposed in [2] imply…
J. B. PendryJun 28, 2002
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Creation of solitons and vortices by Bragg reflection of Bose-Einstein condensates in an optical lattice
We study the dynamics of Bose-Einstein condensates in an optical lattice and harmonic trap. The condensates are set in motion by displacing the trap and initially follow simple semiclassical paths,…
R. G. Scott, A. M. Martin, T. M. Fromhold et al.Jun 27, 2002
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Bose-Einstein condensates in a one-dimensional double square well: Analytical solutions of the Nonlinear Schrödinger equation and tunneling splittings
We present a representative set of analytic stationary state solutions of the Nonlinear Schrödinger equation for a symmetric double square well potential for both attractive and repulsive…
K. W. Mahmud, J. N. Kutz, W. P. ReinhardtJun 27, 2002
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Spin-polarized bipolar transport and its applications
In spin-polarized bipolar transport both electrons and holes in doped semiconductors contribute to spin-charge coupling. The current conversion between the minority (as referred to carriers and not…
S. Das Sarma, Jaroslav Fabian, Igor ZuticJun 27, 2002
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Quantum partition noise of photo-created electron-hole pairs
We show experimentally that even when no bias voltage is applied to a quantum conductor, the electronic quantum partition noise can be investigated using GHz radiofrequency irradiation of a…
L. -H. Reydellet, P. Roche, D. C. Glattli et al.Jun 26, 2002
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Dilute resonating gases and the third virial coefficient
We study dilute gases with short range interactions and large two-body scattering lengths. At temperatures between the condensation temperature and the scale set by therange of the potential there is…
Paulo F. Bedaque, Gautam RupakJun 26, 2002
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Minority Game: a mean-field-like approach
We calculate the standard deviation of (N1-N0), the difference of the number of agents choosing between the two alternatives of the minority game. Our approach is based on two approximations: we use…
Ines Caridi, Horacio CevaJun 26, 2002
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Confinement of acoustical vibrations in a semiconductor planar phonon cavity
Extending the idea of optical microcavities to sound waves, we propose a phonon cavity consisting of two semiconductor superlattices enclosing a spacer with thickness determined by the acoustic…
M. Trigo, A. Bruchhausen, A. Fainstein et al.Jun 25, 2002
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Dynamics of optically generated vortices in a one-component ultracold fermionic gases
We show that the phase imprinting method is capable of generating vortices in a one-component gas of neutral fermionic atoms at zero and finite temperatures. We find qualitative differences in…
Tomasz Karpiuk, Miroslaw Brewczyk, Kazimierz RzazewskiJun 25, 2002
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Remarks on reply to Johansen's comment
Remarks on reply (cond-mat/0206368) to Johansen's comment (cond-mat/0205249)
Anders JohansenJun 25, 2002
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Currents in Systems of Mesoscopic Noisy Rings
A semi-phenomenological model is proposed to study dynamics and stedy states of magnetic fluxes and currents in mesoscopic rings and cylinders at non-zero temperature. The model is based on a…
J. Dajka, J. Luczka, M. Szopa et al.Jun 25, 2002
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Zero Permeability Materials (ZmuM): A way out of the "Left Handed Materials" trap
Recently it has been shown that due to losses the claims on observation of negative refraction using metamaterials are questionable. In this paper we discus an interesting case that is based in…
N. Garcia, M. Munoz, E. V. Ponizovskaya et al.Jun 25, 2002
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Wedge - Shaped Absorbing Samples Look Left Handed: The Problem of Interpreting Negative Refraction, and its Solution
We report experiments of light transmissivity at wavelengths: 532 and 400 nm, through an Au film with a wedge shape. Our results mimic the negative refraction reported by others for so-called left…
M. Sanz, A. C. Papageorgopoulos, W. F. Egelhoff et al.Jun 25, 2002
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Longitudinal spin decoherence in spin diffusion in semiconductors
We have set up a set of many-body kinetic Bloch equations with spacial inhomogeneity. We reexamined the widely adopted quasi-independent electron model and showed the inadequacy of this model in…
M. Q. Weng, M. W. WuJun 24, 2002
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Calculations of the Effective Permitivity of a Periodic Array of Wires and the Left-Handed Materials
We present finite-differences time- domain calculations of the effective permitivity of a periodic array of Cu strip wires that are an ingredient needed in metamaterials for obtaining left-handed…
N. Garcia, E. V. PonizovskayaJun 24, 2002
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Velocity dependent interactions and a new sum rule in bcc He
Recent neutron scattering experiments [PRL, 88,p.195301 (2002)] on solid 4He, discovered a new optic-like mode in the bcc phase. This excitation was predicted by a recently proposed model…
Nir GovJun 24, 2002
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Losses for microwave transmission in metamaterials for producing left-handed materials: The strip wires
This paper shows that the effective dielectric permitivity for the metamaterials used so far to obtain left-handed materials, with strip wires 0.003cm thick, is dominated by the imaginary part at…
E. V. Ponizovskaya, M. Nieto-Vesperinas, N. GarciaJun 24, 2002
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The random model for simulation of the growth of small populations
The probability of the survival of the population of individuals of both sexes of given mature age, procreation rate and structure stability has been searched in the numerical experiment. The…
Kazimierz PaterJun 23, 2002
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Long-range spatial correlations in the exciton energy distribution in GaAs/AlGaAs quantum-wells
Variations in the width of a quantum well (QW) are known to be a source of broadening of the exciton line. Using low temperature near-field optical microscopy, we have exploited the dependence of…
Y. Yayon, A. Esser, M. Rappaport et al.Jun 23, 2002
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