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Condensed Matter papers — page 77

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Mixed-Valence Tetranuclear Manganese Single-Molecule Magnets
The preparations, X-ray structures, and detailed physical characterizations are presented for two new mixed-valence tetranuclear manganese complexes that function as single-molecule magnets…
Jae Yoo, Akira Yamaguchi, Motohiro Nakano et al.Sep 26, 2001
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Volatility driven market in a generalised Lotka Voltera formalism
The Generalized Lotka Voltera (GLV) formalism has been introduced in order to explain the power law distributions in the individual wealth (wi (t)) (Pareto law) and financial markets returns…
Yoram Louzoun, Sorin SolomonSep 26, 2001
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Quantum effects on dynamics of instabilities in Bose-Einstein condensates
Dynamics of fluctuations in unstable Bose-Einstein condensates is analyzed by the solution of approximate operator equations. In the case of a condensate with a negative scattering length the present…
V. A. YurovskySep 25, 2001
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Stable Skyrmions in two-component Bose-Einstein condensates
We show that stable Skyrmions exist in two-component atomic Bose-Einstein condensates, in the regime of phase separation. Using full three-dimensional simulations we find the stable Skyrmions with…
Richard A. Battye, N. R. Cooper, Paul M. SutcliffeSep 25, 2001
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Temperature dependent shifts in collective excitations of a gaseous Bose-Einstein condensate
The moment method is applied to the quantum theory for a trapped dilute gas, obtaining equations for the evolution of the cloud. These equations proof the existence of undamped oscillations in a…
Juan Jose Garcia-RipollSep 25, 2001
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Excitonic effects in solids described by time-dependent density functional theory
Starting from the many-body Bethe-Salpeter equation we derive an exchange-correlation kernel fxc that reproduces excitonic effects in bulk materials within time-dependent density functional…
Lucia Reining, Valerio Olevano, Angel Rubio et al.Sep 24, 2001
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Superfluid pairing in a polarized dipolar Fermi gas
We calculate the critical temperature of a superfluid phase transition in a polarized Fermi gas of dipolar particles. In this case the order parameter is anisotropic and has a nontrivial energy…
M. A. Baranov, M. S. Mar'enko, Val. S. Rychkov et al.Sep 24, 2001
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Auger-electron cascades in diamond and amorphous carbon
We have analyzed the cascade of secondary electrons in diamond and amorphous carbon generated by the thermalisation of a single Auger electron. The elastic electron mean free path was calculated as a…
Beata Ziaja, David van der Spoel, Abraham Szoeke et al.Sep 24, 2001
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Single-Molecule Magnets: Jahn-Teller Isomerism and the Origin of Two Magnetization Relaxation Processes in Mn12 Complexes
New Mn12 single-molecule magnets (SMM's) with the composition [Mn12O12(O2CR)16(H2O)4] were prepared and structurally characterized. Complexes of this type can exhibit two out-of-phase ac magnetic…
Sheila M. J. Aubin, Ziming Sun, Hilary J. Eppley et al.Sep 20, 2001
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Ratchet-Induced Segregation and Transport of Non-Spherical Grains
We consider through simulations the behavior of elongated grains on a vibrating ratchet-shaped base. We observe differences in layer velocity profile and in net grain velocity for grains that are…
J. F. Wambaugh, C. Reichhardt, C. J. OlsonSep 20, 2001
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Multi-scale clustering in granular surface flows
We investigate steady granular surface flows in a rotating drum and demonstrate the existence of rigid clusters of grains embedded in the flowing layer. These clusters are fractal and their size is…
D. Bonamy, F. Daviaud, L. Laurent et al.Sep 20, 2001
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Comparative simulation study of colloidal gels and glasses
Using computer simulations, we identify the mechanisms causing aggregation and structural arrest of colloidal suspensions interacting with a short-ranged attraction at moderate and high densities.…
Antonio M. Puertas, Matthias Fuchs, Michael E. CatesSep 20, 2001
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Large Deviation of the Density Profile in the Steady State of the Open Symmetric Simple Exclusion Process
We consider an open one dimensional lattice gas on sites i=1,...,N, with particles jumping independently with rate 1 to neighboring interior empty sites, the simple symmetric exclusion…
B. Derrida, J. L. Lebowitz, E. R. SpeerSep 19, 2001
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Spin-based optical quantum gates via Pauli blocking in semiconductor quantum dots
We present a solid-state implementation of ultrafast conditional quantum gates. Our proposal for a quantum-computing device is based on the spin degrees of freedom of electrons confined in…
E. Pazy, E. Biolatti, T. Calarco et al.Sep 19, 2001
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Spin filtering by ferromagnetic nanowires
We show that electrical current flowing through nanowires made of ferromagnetic disordered alloys can become highly spin polarized.
A. T. Costa, R. B. MunizSep 19, 2001
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Charge transport through quantum dots via time-varying tunnel couplings
We describe a novel mechanism for charge pumping through tunnel-coupled quantum dots in the regime of strong Coulomb blockade. The quantum state of an additional electron within the structure is…
F. Renzoni, T. BrandesSep 19, 2001
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Integrable Stochastic Ladder Models
A general way to construct ladder models with certain Lie algebraic or quantum Lie algebraic symmetries is presented. These symmetric models give rise to series of integrable systems. It is shown…
Sergio Albeverio, Shao-Ming FeiSep 18, 2001
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A faster implementation of the pivot algorithm for self-avoiding walks
The pivot algorithm is a Markov Chain Monte Carlo algorithm for simulating the self-avoiding walk. At each iteration a pivot which produces a global change in the walk is proposed. If the resulting…
Tom KennedySep 17, 2001
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The complex superstructure in Mg1-xAlxB2 at x~0.5
Electron diffraction and high resolution microscopy have been performed on Mg1-xAlxB2 with x~0.5. This composition displays a superstructure with a repeat period of exactly 2c along the c axis and…
H. W. Zandbergen, M. Y. Wu, H. Jiang et al.Sep 17, 2001
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Abnormal Occupation REvisited
It is demonstrated the Fermi surface of dense neutron matter may experience a rearrangement near the onset of pion condensation, due to strong momentum dependence of the effective interaction induced…
J. W. Clark, V. A. Khodel, M. V. ZverevSep 17, 2001
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Can Short-Range Interactions Mediate a Bose Metal Phase in 2D?
We show here based on a 1-loop scaling analysis that short-range interactions are strongly irrelevant perturbations near the insulator-superconductor (IST) quantum critical point. The lack of any…
Philip Phillips, Denis DalidovichSep 14, 2001
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Bose-Einstein Condensation and The Lambda Transition in Liquid Helium
Integrating seminal ideas of London, Feynman, and Feenberg, this paper continues the development of an ab initio theory of the lambda transition in liquid 4He. The theory is based on variational…
T. Lindenau, M. L. Ristig, J. W. Clark et al.Sep 14, 2001
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Erratum: "Kinetic Theory of Spin Coherence of Electrons in Semiconductors" [Journal of Superconductivity 14, 245 (2001)]
Two typos in the published paper are pointed out. Both are just typos and the calculations in that paper are based on the correct formulism.
M. W. WuSep 14, 2001
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Double Exchange in Electron Doped Ca1-xYxMnO3 Manganites
We have studied structural, magnetic and transport properties as a function of temperature and magnetic field in the electron doped manganite YxCa1-xMnO3, for 0<x<0.25. We found that in the…
H. Aliaga, M. T. Causa, A. Butera et al.Sep 13, 2001
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One-Parameter Scaling of the Conductivity of Si:B: A Temperature-Independent Variable-Range Hopping Prefactor
For insulating Si:B with dopant concentrations from 0.75 nc to the critical concentration nc, the conductivity ranging over five orders of magnitude collapses using a single scaling parameter T*…
M. P. Sarachik, P. DaiSep 12, 2001
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