Differential Photoelectron Holography: A New Approach for Three-Dimensional Atomic ImagingWe propose differential holography as a method to overcome the long-standing forward-scattering problem in photoelectron holography and related techniques for the three-dimensional imaging of atoms.…S. Omori, Y. Nihei, E. Rotenberg et al.·Jul 28, 2003SaveLearn
Magnetic properties of Yb2Mo2O7 and Gd2Mo2O7 from rare earth Mossbauer measurementsUsing 170-Yb and 155-Gd Mossbauer measurements down to 0.03K, we have examined the semiconducting pyrochlore Yb2Mo2O7 where the Mo intra-sublattice interaction is anti-ferromagnetic and the metallic…J. A. Hodges, P. Bonville, A. Forget et al.·Jul 28, 2003SaveLearn
Low temperature spin fluctuations in geometrically frustrated Yb3Ga5O12In the garnet structure compound Yb3Ga5O12, the Yb3+ ions (ground state effective spin S' = 1/2) are situated on two interpenetrating corner sharing triangular sublattices such that frustrated…J. A. Hodges, P. Bonville, M. Rams et al.·Jul 28, 2003SaveLearn
Neuromorphometric characterization with shape functionalsThis work presents a procedure to extract morphological information from neuronal cells based on the variation of shape functionals as the cell geometry undergoes a dilation through a wide interval…Marconi Soares Barbosa, Luciano da Fontoura Costa, Esmerindo de Sousa Bernardes·Jul 23, 2003SaveLearn
Vortex Rings in two Component Bose-Einstein CondensatesWe study the structure of the vortex core in two-component Bose-Einstein condensates. We demonstrate that the order parameter may not vanish and the symmetry may not be restored in the core of the…Max A. Metlitski, Ariel R. Zhitnitsky·Jul 23, 2003SaveLearn
Momentum distribution of a trapped Fermi gas with large scattering lengthUsing a scattering length parametrization of the BCS-BEC crossover as well as the local density approximation for the density profile, we calculate the momentum distribution of a harmonically trapped…L. Viverit, S. Giorgini, L. P. Pitaevskii et al.·Jul 22, 2003SaveLearn
Heat Transfer in Turbulent Rayleigh-Benard Convection below the Ultimate RegimeA Rayleigh-Bénard cell has been designed to explore the Prandtl (Pr) dependence of turbulent convection in the cross-over range 0.7<Pr<21 and for the full range of soft and hard turbulences, up to…P. -E. Roche, B. Castaing, B. Chabaud et al.·Jul 22, 2003SaveLearn
Fast control of quantum states in quantum dots: limits due to decoherenceWe study the kinetics of confined carrier-phonon system in a quantum dot under fast optical driving and discuss the resulting limitations to fast coherent control over the quantum state in such…Pawel Machnikowski, Lucjan Jacak·Jul 22, 2003SaveLearn
Breached Pairing Superfluidity at Finite Temperature and DensityA general analysis on Fermion pairing at finite temperature and density between different species with mismatched Fermi surfaces is presented. Very different from the temperature effect of BCS phase,…Jinfeng Liao, Pengfei Zhuang·Jul 22, 2003SaveLearn
Exact result for nonreciprocity in one-dimensional wave transmissionFor sound waves impinging on a one-dimensional medium, we show that nonlinearity can lead to nonreciprocal transmission, without dissipation or broken time reversal invariance. Placing…Onuttom Narayan, Abhishek Dhar·Jul 22, 2003SaveLearn
Nuclear Magnetic Resonance in a Ferromagnet-Semiconductor HeterostructureWe report the observation of nuclear magnetic resonance (NMR) in a ferromagnet-semiconductor heterostructure in the presence of a spin-polarized current. Spin-polarized electrons injected from a…J. Strand, B. D. Schultz, A. F. Isakovic et al.·Jul 21, 2003SaveLearn
Pseudogap and Competing States in Underdoped CupratesI shall argue that the high Tc problem is the problem of doping into a Mott insulator. Furthermore, the well documented pseudo-gap phenomenon in underdoped cuprates holds the key to understanding…Patrick A. Lee·Jul 21, 2003SaveLearn
Hysteresis loops of Co-Pt perpendicular magnetic multilayersWe develop a phenomenological model to study magnetic hysteresis in two samples designed as possible perpendicular recording media. A stochastic cellular automata model captures cooperative behavior…David L. Mobley, Christopher R. Pike, Joseph E. Davies et al.·Jul 21, 2003SaveLearn
Measurement of phosphorus segregation in silicon at the atomic-scale using STMIn order to fabricate precise atomic-scale devices in silicon using a combination of scanning tunnelling microscopy (STM) and molecular beam epitaxy it is necessary to minimize the…Lars Oberbeck, Neil J. Curson, Toby Hallam et al.·Jul 21, 2003SaveLearn
Competition between adaptive agents: from learning to collective efficiency and backWe use the Minority Game and some of its variants to show how efficiency depends on learning in models of agents competing for limited resources. Exact results from statistical physics give a clear…Damien Challet·Jul 21, 2003SaveLearn
Probing semiclassical analogue gravity in Bose--Einstein condensates with widely tunable interactionsBose-Einstein condensates (BEC) have recently been the subject of considerable study as possible analogue models of general relativity. In particular it was shown that the propagation of phase…Carlos Barcelo, Stefano Liberati, Matt Visser·Jul 20, 2003SaveLearn
Phonon scattering in quasicrystalline i-Al72Pd19.5Mn8.5: A study of the low-temperature thermal conductivityWe measured the thermal conductivity of an icosahedral quasicrystal i-Al72Pd19.5Mn8.5 in the temperature range between 0.4 K and 300 K. The analysis of the low-temperature results was based…A. Bilusic, A. Smontara, J. Dolinsek et al.·Jul 18, 2003SaveLearn
The Effect of Mn Interstitials on the Lattice Parameter of Ga(1-x)Mn(x)AsStructural investigation of as-grown as well as annealed Ga(1-x)Mn(x)As epilayers was carried out using high resolution X-ray diffraction (XRD) measurements for a wide range of Mn concentrations…I. Kuryliszyn-Kudelska, J. Z. Domagala, T. Wojtowicz et al.·Jul 18, 2003SaveLearn
Two-phase flow in porous media: dynamical phase transitionTwo-phase flow systems in porous media have complex dynamics. It is well established that a wide range of system parameters like viscosities and porosity as well as flow parameters such as pressure…Henning Arendt Knudsen, Alex Hansen·Jul 18, 2003SaveLearn
Phase engineering of controlled entangled number states in a single component Bose-Einstein condensate in a double wellWe propose a model for the creation of entangled number states (Schrödinger cat states) of a Bose-Einstein condensate in a double well through simple phase engineering. We show that a π-phase…K. W. Mahmud, H. Perry, W. P. Reinhardt·Jul 18, 2003SaveLearn
A Minimal Model for Tag-based CooperationRecently, Riolo et al. [R. L. Riolo et al., Nature 414, 441 (2001)] showed by computer simulations that cooperation can arise without reciprocity when agents donate only to partners who are…Arne Traulsen, Heinz Georg Schuster·Jul 17, 2003SaveLearn
Scattering length for composite bosons in the BCS-BEC crossoverThe present manuscript concerns the calculation of the boson-boson scattering length for the composite bosons that form as bound-fermion pairs in the strong-coupling limit of the BCS-BEC crossover.…P. Pieri, G. C. Strinati·Jul 17, 2003SaveLearn
Thermodynamics of a trapped interacting Bose gas and the renormalization groupWe apply perturbative renormalization group theory to the symmetric phase of a dilute interacting Bose gas which is trapped in a three-dimensional harmonic potential. Using Wilsonian energy-shell…G. Metikas, O. Zobay, G. Alber·Jul 16, 2003SaveLearn
The epsilon-expansion in the symmetry-broken phase of an interacting Bose gas at finite temperatureWe discuss the application of the momentum-shell renormalization group method to the interacting homogeneous Bose gas in the symmetric and in the symmetry-broken phases. It is demonstrated that…G. Metikas, O. Zobay, G. Alber·Jul 16, 2003SaveLearn
Induced four fold anisotropy and bias in compensated NiFe/FeMn double layersA vector spin model is used to show how frustrations within a multisublattice antiferromagnet such as FeMn can lead to four-fold magnetic anisotropies acting on an exchange coupled ferromagnetic…T. Mewes, B. Hillebrands, R. L. Stamps·Jul 16, 2003SaveLearn