Bose Condensate in External Potential: A Thomas-Fermi ApproachThe Bose condensate in an external potential is treated in the Thomas-Fermi approximation.K. Huang·Sep 3, 1996SaveLearn
Mode damping in a commensurate monolayer solidThe normal modes of a commensurate monolayer solid may be damped by mixing with elastic waves of the substrate. This was shown by B. Hall et al., Phys. Rev. B 32, 4932 (1985), for perpendicular…L. W. Bruch, F. Y. Hansen·Sep 3, 1996SaveLearn
Phase Diagram of the Two Dimensional Lattice Coulomb GasWe use Monte Carlo simulations to map out the phase diagram of the two dimensional Coulomb gas on a square lattice, as a function of density and temperature. We find that the Kosterlitz-Thouless…Pramod Gupta, S. Teitel·Sep 3, 1996SaveLearn
Higher dimensional realizations of activated dynamic scaling at random quantum transitionsWe show that many of the unusual properties of the one-dimensional random quantum Ising model are shared also by dilute quantum Ising systems in the vicinity of a certain quantum transition in …T. Senthil, Subir Sachdev·Sep 3, 1996SaveLearn
Ground-State Roughness of the Disordered Substrate and Flux Line in d=2We apply optimization algorithms to the problem of finding ground states for crystalline surfaces and flux lines arrays in presence of disorder. The algorithms provide ground states in polynomial…Chen Zeng, A. Alan Middleton, Y. Shapir·Sep 3, 1996SaveLearn
Magnetocrystalline Anisotropy Energy of Transition Metal Thin Films: A Non-perturbative TheoryThe magnetocrystalline anisotropy energy E(anis) of free-standing monolayers and thin films of Fe and Ni is determined using two different semi-empirical schemes. Within a tight-binding calculation…A. Lessard, T. H. Moos, W. Huebner·Sep 3, 1996SaveLearn
Effect of Level Statistics on Superconductivity in Ultrasmall Metallic GrainsWe examine the destruction of superconducting pairing in metallic grains as their size is decreased for both even and odd numbers of electrons. This occurs when the average level spacing d is of the…Robert A. Smith, Vinay Ambegaokar·Sep 3, 1996SaveLearn
Static avalanches and Giant stress fluctuations in SilosWe propose a simple model for arch formation in silos. We show that small pertubations (such as the thermal expansion of the beads) may lead to giant stress fluctuations on the bottom plate of the…P. Claudin, J. -P. Bouchaud·Sep 3, 1996SaveLearn
Anomalies in the Relaxation of Small Magnetic Particles at Very Low TemperaturesThe magnetization relaxation rate of small gamma-Fe2O3 particles dispersed in a silica matrix has been measured from 60 mK to 5 K. It shows a minimum around 150 mK, that can be discussed in terms of…R. Sappey, E. Vincent, J. Hammann et al.·Sep 3, 1996SaveLearn
Comment on ``New Class of Resonances at the Edge of the Two-Dimensional Electron Gas.''A reproducible resonance structure in the conductance through an incompressible strip in the quantized Hall regime was recently reported by Zhitenev et al. Although the authors disfavored the…Dmitri B. Chklovskii·Sep 3, 1996SaveLearn
Competition between the Mott transition and the Anderson localization in 1D disordered interacting electron systemsThe competition between the Mott transition and the Anderson localization in one dimensional electron systems is studied based upon the bosonization and the renormalization group method. The beta…Satoshi Fujimoto, Norio Kawakami·Sep 2, 1996SaveLearn
Estimation of properties of low-lying excited states of Hubbard models : a multi-configurational symmetrized projector quantum Monte Carlo approachWe present in detail the recently developed multi-configurational symmetrized projector quantum Monte Carlo (MSPQMC) method for excited states of the Hubbard model. We describe the implementation of…Bhargavi Srinivasan, S. Ramasesha, H. R. Krishnamurthy·Sep 2, 1996SaveLearn
Tri-critical behavior in rupture induced by disorderWe discover a qualitatively new behavior for systems where the load transfer has limiting stress amplification as in real fiber composites. We find that the disorder is a relevant field leading to…J. V. Andersen, D. Sornette, K. -T. Leung·Sep 2, 1996SaveLearn
Tunneling with the Lorentz Force and the FrictionWe present a semiclassical study of a transport process, the tunneling, in the presence of a magnetic field and a dissipative environment. We have found that the problem can be mapped onto an…Ping Ao·Sep 2, 1996SaveLearn
Nonequilibrium corrections in the pressure tensor due to an energy fluxThe physical interpretation of the nonequilibrium corrections in the pressure tensor for radiation submitted to an energy flux obtained in some previous works is revisited. Such pressure tensor is…Raquel Dominguez-Cascante, Jordi Faraudo·Sep 2, 1996SaveLearn
Theory of the density fluctuation spectrum of strongly correlated electronsThe density response function N(q,ω) of the two-dimensional t-J model is studied starting from a mixed gauge formulation of the slave boson approach. Our results for N(q, ω) are in remarkable…G. Khaliullin, P. Horsch·Sep 2, 1996SaveLearn
Topology of the support of the two-dimensional random walkWe study the support (i.e. the set of visited sites) of a t step random walk on a two-dimensional square lattice in the large t limit. A broad class of global properties M(t) of the support is…F. van Wijland, S. Caser, H. J. Hilhorst·Sep 2, 1996SaveLearn
Characteristic Crossing Points in Specific Heat Curves of Correlated SystemsAttention is drawn to the observation that in many correlated systems (e.g. 3He, heavy fermion systems and Hubbard models) the specific heat curves, when plotted for different values of some…D. Vollhardt·Sep 2, 1996SaveLearn
Non-magnetic Impurities in Spin Gap SystemsThe effect of non-magnetic impurities is discussed for both the two-leg Heisenberg ladder system and other spin liquids with excitation gap. It is shown that the random depletion of spins introduces…N. Nagaosa, A. Furusaki, M. Sigrist et al.·Sep 2, 1996SaveLearn
Quantum dot self consistent electronic structure and the Coulomb blockadeWe employ density functional theory to calculate the self consistent electronic structure, free energy and linear source-drain conductance of a lateral semiconductor quantum dot patterned via surface…M. Stopa·Sep 2, 1996SaveLearn
Theory of magnetic short-range order for itinerant electron systemsOn the basis of the one--band t-t'-Hubbard model a self-consistent renormalization theory of magnetic short--range order (SRO) in the paramagnetic phase is presented combining the four-field…U. Trapper, D. Ihle, H. Fehske·Sep 2, 1996SaveLearn
Vortex Waves in a Cloud of Bose Einstein - Condensed, Trapped Alkali - Metal AtomsWe consider the vortex state solution for a rotating cloud of trapped, Bose Einstein - condensed alkali atoms and study finite temperature effects. We find that thermally excited vortex waves can…Carlo F. Barenghi·Sep 2, 1996SaveLearn
Novel correlations in two dimensions: Two-body problemWe discuss a many-body Hamiltonian with two- and three-body interactions in two dimensions introduced recently by Murthy, Bhaduri and Sen. Apart from an analysis of some exact solutions in the…R. K. Bhaduri, Avinash Khare, J. Law et al.·Sep 2, 1996SaveLearn
Sum rule for the optical Hall angleWe consider the optical Hall conductivity of a general electronic medium and prove that the optical Hall angle obeys a new sum rule. This sum rule governs the response of an electronic fluid to a…H. D. Drew, P. Coleman·Sep 2, 1996SaveLearn
How should we interpret the two transport relaxation times in the cuprates ?We observe that the appearance of two transport relaxation times in the various transport coefficients of cuprate metals may be understood in terms of scattering processes that discriminate between…P. Coleman, A. J. Schofield, A. M. Tsvelik·Sep 2, 1996SaveLearn