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Condensed Matter papers — page 6

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Imaging density disturbances in water with 41.3 attosecond time resolution
We show that the momentum flexibility of inelastic x-ray scattering may be exploited to invert its loss function, alowing real time imaging of density disturbances in a medium. We show the…
P. Abbamonte, K. D. Finkelstein, M. D. Collins et al.Nov 17, 2003
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Spurious magnetism in high-Tc superconductor
One challenge in condensed-matter physics is to unravel the interplay between magnetism and superconductivity in copper oxides with a high critical temperature (Tc). Kang et al. claim to have…
P. K. Mang, S. Larochelle, M. GrevenNov 16, 2003
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Tunneling effect of the spin-2 Bose condensate driven by external magnetic fields
In this paper, we have studied tunneling effect of the spin-2 Bose condensate driven by external magnetic field. We find that the population transfers among spin-0 and spin-1, spin-0 and…
Zhao-xian Yu, Zhi-yong JiaoNov 15, 2003
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Buffer gas cooling and trapping of atoms with small magnetic moments
Buffer gas cooling was extended to trap atoms with small magnetic moment (mu). For mu greater than or equal to 3muB, 1e12 atoms were buffer gas cooled, trapped, and thermally isolated in ultra high…
J. G. E. Harris, R. A. Michniak, S. V. Nguyen et al.Nov 14, 2003
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Magnetization reversal and spin dynamics exchange in biased F/AF bilayers probed with complex permeability spectra
The spin dynamics of the ferromagnetic pinned layer of ferro-antiferromagnetic coupled NiFe/MnNi bilayers is investigated in a broad frequency range (30 MHz-6 GHz). A phenomenological model based on…
David Spenato, Jamal Ben Youssef, Henri Le GallNov 14, 2003
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Magnon squeezing in an antiferromagnet: reducing the spin noise below the standard quantum limit
At absolute zero temperature, thermal noise vanishes when a physical system is in its ground state, but quantum noise remains as a fundamental limit to the accuracy of experimental measurements. Such…
J. Zhao, A. V. Bragas, D. J. Lockwood et al.Nov 13, 2003
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Decoherence in Nanostructures and Quantum Systems
Decoherence phenomena are pervasive in the arena of nanostructures but perhaps even more so in the study of the fundamentals of quantum mechanics and quantum computation. Since there has been little…
R. F. O'ConnellNov 13, 2003
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Spectroscopy of subthreshold inelastic radiation-induced processes in cryocrystals
A review is given on the recent spectroscopic studies of the electronic excitation induced processes of large-scale atomic displacements in atomic cryocrystals, including defect formation, atomic and…
A. N. OgurtsovNov 13, 2003
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Resonance photon yield from solid Xe below the bottom of the n=1 excitonic band
The results of time-resolved spectroscopic study of photon yield from solid Xe below the bottom of the lowest excitonic band under selective photoexcitation by synchrotron radiation are presented
A. N. Ogurtsov, E. V. Savchenko, S. Vielhauer et al.Nov 13, 2003
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Self-trapped excitons in solid Kr: Time resolved study
The results of time-resolved study of two types of self-trapped excitons in solid Kr are presented
A. N. Ogurtsov, E. V. Savchenko, S. Vielhauer et al.Nov 13, 2003
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Molecular center photoabsorption in solid Ar
Recent experimental data on spectroscopic determination of photoabsorption of molecular centers in solid Ar is presented.
A. N. Ogurtsov, E. V. Savchenko, S. Vielhauer et al.Nov 13, 2003
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The conundrum of stock versus bond prices
In a general way, stock and bond prices do not display any significant correlation. Yet, if we concentrate our attention on specific episodes marked by a crash followed by a rebound, then we observe…
Sergei Maslov, Bertrand M. RoehnerNov 13, 2003
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Does the price multiplier effect also hold for stocks?
The price multiplier effect provides precious insight into the behavior of investors during episodes of speculative trading. It tells us that the higher the price of an asset is (within a set of…
Sergei Maslov, Bertrand M. RoehnerNov 13, 2003
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An ab initio cluster study of atomic oxygen chemisorption on Ga-rich GaAs(100) (2x1) and beta(4x2) surfaces
Ab initio self-consistent total energy calculations using second order Moller-Plesset perturbation theory and Hay-Wadt effective core potentials for gallium and arsenic have been used to investigate…
Michael L. Mayo, Asok K. RayNov 13, 2003
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Many-body aspects of positron annihilation in the electron gas
We investigate positron annihilation in electron liquid as a case study for many-body theory, in particular the optimized Fermi Hypernetted Chain (FHNC-EL) method. We examine several approximation…
V. Apaja, S. Denk, E. KrotscheckNov 12, 2003
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Influence of mass difference on dynamic properties of isotope mixtures
We present the results of a Molecular Dynamics computer simulations of a two component isotope mixture of Lennard-Jones particles, monodisperse in size but different in masses, at a fixed average…
N. Kiriushcheva, S. V. KuzminNov 12, 2003
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Separation of the first- and second-order contributions in magneto-optic Kerr effect magnetometry of epitaxial FeMn/NiFe bilayers
The influence of second-order magneto-optic effects on Kerr effect magnetometry of epitaxial exchange coupled FeMn/NiFe-bilayers is investigated. A procedure for separation of the first- and…
T. Mewes, H. Nembach, M. Rickart et al.Nov 12, 2003
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Solitons, solitonic vortices, and vortex rings in a confined Bose-Einstein condensate
Quasi-one-dimensional solitons that may occur in an elongated Bose-Einstein condensate become unstable at high particle density. We study two basic modes of instability and the corresponding…
S. Komineas, N. PapanicolaouNov 12, 2003
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Stations, trains and small-world networks
The clustering coefficient, path length and average vertex degree of two urban train line networks have been calculated. The results are compared with theoretical predictions for appropriate random…
Katherine A Seaton, Lisa M HackettNov 11, 2003
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Antilocalization in gated 2D quantum well structures with composition gradient
Low-field magnetoconductivity caused by the quantum interference is studied in the gated 2D quantum well structures with the composition gradient. It is shown that the Dresselhaus mechanism well…
A. V. Germanenko, G. M. Minkov, O. E. Rut et al.Nov 11, 2003
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First-principles study of electron transport through C20 cages
Electron transport properties of C20 molecules suspended between gold electrodes are investigated using first-principles calculations. Our study reveals that the conductances are quite sensitive…
Megumi Otani, Tomoya Ono, Kikuji HiroseNov 8, 2003
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Magnetic and thermodynamic properties of RMnO3 (R = Pr, Nd)
The ground state properties of the pure perovskite compounds PrMnO3 and NdMnO3 were investigated by magnetization, magnetic AC susceptibility and specific heat measurements. A strongly…
J. Hemberger, M. Brando, R. Wehn et al.Nov 7, 2003
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Instabilities of a Bose-Einstein condensate in a periodic potential: an experimental investigation
By accelerating a Bose-Einstein condensate in a controlled way across the edge of the Brillouin zone of a 1D optical lattice, we investigate the stability of the condensate in the vicinity of the…
M. Cristiani, O. Morsch, N. Malossi et al.Nov 7, 2003
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Weakly nonlocal continuum theories of granular media: restrictions from the Second Law
The classical continuum mechanical model of granular media of rational thermodynamics results in a Coulomb-Mohr type equilibrium stress-strain relation. The proof is based on a two component material…
P. VanNov 7, 2003
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Anomalous Hall effect in paramagnetic two dimensional systems
We investigate the possibility of observing the anomalous Hall effect (AHE) in two dimensional paramagnetic systems. We apply the semiclassical equations of motion to carriers in the conduction and…
Dimitrie Culcer, Allan MacDonald, Qian NiuNov 6, 2003
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