Resonance shift effects in apertureless scanning near-field optical microscopyWe develop a theory to study apertureless scanning near-field optical microscopy which takes into account retardation, higher multipoles of the tip, and the multiple scattering between the tip and…J. A. Porto, P. Johansson, S. P. Apell et al.·Aug 26, 2002SaveLearn
Critical onset in coherent oscillations between two weakly coupled Bose-Einstein condensatesThe Josephson effects in two weakly linked Bose-Einstein condensates have been studied recently. In this letter, we study the equations derived by Giovanazzi et. al. [Phys. Rev. Lett. 84, 4521…Li-Bin Fu, Jie Liu, Shi-Gang Chen·Aug 26, 2002SaveLearn
Quantum spin field effect transistorWe propose, theoretically, a new type of quantum field effect transistor that operates purely on the flow of spin current in the absence of charge current. This spin field effect transistor (SFET) is…Baigeng Wang, Jian Wang, Hong Guo·Aug 26, 2002SaveLearn
Singularity formation in the Gross-Pitaevskii Equation and Collapse in BECWe study a mechanism of collapse of the condensate wave function in the Gross-Pitaevskii theory with attractive interparticle interaction. We reformulate the Gross-Pitaevskii equation as Newton's…A. V. Rybin, I. P. Vadeiko, G. G. Varzugin et al.·Aug 26, 2002SaveLearn
The Hierarchical Reference Theory as applied to square well fluids of variable rangeContinuing our investigation into the numerical properties of the Hierarchical Reference Theory, we study the square well fluid of range lambda from slightly above unity up to 3.6. After briefly…Albert Reiner, Gerhard Kahl·Aug 25, 2002SaveLearn
Basic Problems of a Microscopic Theory of a Many Body Quantum SystemBasic problems of a microscopic theory of many body quantum systems and different aspects of a new approach which can help in solving them are discussed in detail. To this effect we make a critical…Y. S. Jain·Aug 23, 2002SaveLearn
Surface characterization and surface electronic structure of organic quasi-one-dimensional charge transfer saltsWe have thoroughly characterized the surfaces of the organic charge-transfer salts TTF-TCNQ and (TMTSF)2PF6 which are generally acknowledged as prototypical examples of one-dimensional conductors. In…M. Sing, U. Schwingenschlogl, R. Claessen et al.·Aug 22, 2002SaveLearn
Fractal noise maps reveal human brain activity: a key for unbiased fMRI analysisBrain metabolism is controlled by complex regulation mechanisms. As part of their nature many complex systems show scaling behavior in their timeseries data. Corresponding scaling exponents can…Stefan Thurner, Christian Windischberger, Ewald Moser et al.·Aug 21, 2002SaveLearn
Self-aligned fabrication process for silicon quantum computer devicesWe describe a fabrication process for devices with few quantum bits (qubits), which are suitable for proof-of-principle demonstrations of silicon-based quantum computation. The devices follow the…T. M. Buehler, R. P. McKinnon, N. E. Lumpkin et al.·Aug 20, 2002SaveLearn
Anomalous diffusion on dynamical networks: A model for interacting epithelial cell migrationWe propose a model for cell migration where epithelial cells are able to detect trajectories of other cells and try to follow them. As cells move along in 2D cell culture, they mark their paths by…Stefan Thurner, Nikolaus Wick, Rudolf Hanel et al.·Aug 20, 2002SaveLearn
Creation of a dipolar superfluid in optical latticesWe show that by loading a Bose-Einstein condensate (BEC) of two different atomic species into an optical lattice, it is possible to achieve a Mott-insulator phase with exactly one atom of each…B. Damski, L. Santos, E. Tiemann et al.·Aug 20, 2002SaveLearn
Encapsulation of phosphorus dopants in silicon for the fabrication of a quantum computerThe incorporation of phosphorus in silicon is studied by analyzing phosphorus delta-doped layers using a combination of scanning tunneling microscopy, secondary ion mass spectrometry and Hall effect…L. Oberbeck, N. J. Curson, M. Y. Simmons et al.·Aug 19, 2002SaveLearn
Scratching the Bose surfaceThis is a `News and Views' article discussing recent proposals for ground states of many boson systems which are neither superfluids nor Mott insulators.Subir Sachdev·Aug 17, 2002SaveLearn
Electric field tunability of nuclear and electronic spin dynamics due to the hyperfine interaction in semiconductor nanostructuresWe present formulas for the nuclear and electronic spin relaxation times due to the hyperfine interaction for nanostructed systems and show that the times depend on the square of the local density of…Ionel Tifrea, Michael E. Flatte·Aug 16, 2002SaveLearn
Quantum Monte Carlo method using phase-free random walks with Slater determinantsWe develop a quantum Monte Carlo method for many fermions that allows the use of any one-particle basis. It projects out the ground state by random walks in the space of Slater determinants. An…Shiwei Zhang, Henry Krakauer·Aug 16, 2002SaveLearn
Evaporation of a packet of quantized vorticityA recent experiment has confirmed the existence of quantized turbulence in superfluid He3-B and suggested that turbulence is inhomogenous and spreads away from the region around the vibrating wire…C. F. Barenghi, D. C. Samuels·Aug 16, 2002SaveLearn
Large amplitude behavior of the Grinfeld instability: a variational approachIn previous work, we have performed amplitude expansions of the continuum equations for the Grinfeld instability and carried them to high orders. Nevertheless, the approach turned out to be…Peter Kohlert, Klaus Kassner, Chaouqi Misbah·Aug 15, 2002SaveLearn
Collapse of Bose-Einstein condensate with dipole-dipole interactionsA dynamics of Bose-Einstein condensate of a gas of bosonic particles with long-range dipole-dipole interactions in a harmonic trap is studied. Sufficient analytical criteria are found both for…Pavel M. Lushnikov·Aug 15, 2002SaveLearn
Chiral exponents in O(N) x O(m) spin models at O(1/N2)The critical exponents corresponding to chirality are computed at O(1/N2) in d-dimensions at the stable chiral fixed point of a scalar field theory with an O(N) x O(m) symmetry. Pade-Borel estimates…J. A. Gracey·Aug 15, 2002SaveLearn
Nonlinear tube waves in permeable formations: Difference frequency generationWe extend earlier work on nonlinear tube wave propagation in permeable formations to study, analytically and numerically, the generation and propagation of a difference frequency, Delta omega =…Yaroslav Tserkovnyak, David Linton Johnson·Aug 14, 2002SaveLearn
Can one hear the shape of a saturation patch?The theory of the acoustics of patchy-saturation in porous media is used to analyze experimental data on wave velocity and attenuation in partially water saturated limestones. It is demonstrated that…Yaroslav Tserkovnyak, David Linton Johnson·Aug 14, 2002SaveLearn
Hydrodynamic modes in a trapped gas of metastable helium above the Bose-Einstein transitionThis article describes experiments performed with an ultracold gas of metastable helium above the Bose-Einstein transition. The gas is trapped in an harmonic magnetic potential and collective…M. Leduc, J. Leonard, F. Pereira dos Santos et al.·Aug 13, 2002SaveLearn
Electron Spin Dynamics in Semiconductors without Inversion SymmetryWe present a microscopic analysis of electron spin dynamics in the presence of an external magnetic field for non-centrosymmetric semiconductors in which the D'yakonov-Perel' spin-orbit…Vadim I. Puller, Lev G. Mourokh, Anatoly Yu. Smirnov et al.·Aug 13, 2002SaveLearn
Probing States in the Mott Insulator RegimeWe propose a method to probe states in the Mott insulator regime produced from a condensate in an optical lattice. We consider a system in which we create time-dependent number fluctuations in a…D. C. Roberts, K. Burnett·Aug 12, 2002SaveLearn
Functional renormalization group for anisotropic depinning and relation to branching processesUsing the functional renormalization group, we study the depinning of elastic objects in presence of anisotropy. We explicitly demonstrate how the KPZ-term is always generated, even in the limit of…Pierre Le Doussal, Kay Joerg Wiese·Aug 11, 2002SaveLearn