Morphology transitions induced by chemotherapy in carcinomas "in situ"Recently, we have proposed a nutrient-limited model for the avascular growth of tumors including cell proliferation, motility and death jr, that, qualitatively reproduces commonly observed…S. C. Ferreira, M. L. Martins, M. J. Vilela·Dec 30, 2002SaveLearn
Calculation of reduced density matrices from correlation functionsIt is shown that for solvable fermionic and bosonic lattice systems, the reduced density matrices can be determined from the properties of the correlation functions. This provides the simplest way to…Ingo Peschel·Dec 30, 2002SaveLearn
Transition Temperature of Dilute, Weakly Repulsive Bose GasWithin a quasiparticle framework, we reconsider the issue of computing the Bose-Einstein condensation temperature (Tc) in a weakly non-ideal Bose gas. The main result of this and previous…Masudul Haque, Andrei E. Ruckenstein·Dec 30, 2002SaveLearn
Tile Hamiltonians for Decagonal PhasesA tile Hamiltonian (TH) replaces the actual atomic interactions in a quasicrystal with effective interactions between and within tiles. We study Al-Co-Ni and Al-Co-Cu decagonal quasicrystals…M. Widom, I. Al-Lehyani, M. Mihalkovic·Dec 26, 2002SaveLearn
Phase dynamics after connection of two separate Bose-Einstein condensatesWe study the dynamics of the relative phase following the connection of two independently formed Bose-Einstein condensates. Dissipation is assumed to be due to the creation of quasiparticles induced…I. Zapata, F. Sols, A. J. Leggett·Dec 26, 2002SaveLearn
First-Principles Study on Peierls Instability in Infinite Single-Row Al WiresWe present the relation between the atomic and spin-electronic structures of infinite single-row atomic wires made of Al atoms during their elongation using first-principles molecular-dynamics…Tomoya Ono, Kikuji Hirose·Dec 26, 2002SaveLearn
Granular media: some ideas from statistical physicsThese lecture notes cover the statics and glassy dynamics of granular media. Most of the lectures were in fact devoted to `force propagation' models. We discuss the experimental and theoretical…J-P Bouchaud·Dec 24, 2002SaveLearn
Amplification of Local Instabilities in a Bose-Einstein Condensate with Attractive InteractionsWe study the collapse of large homogeneous Bose-Einstein condensates due to intrinsic attractive interactions. We observe the amplification of a local instability by seeding a momentum state p…J. K. Chin, J. M. Vogels, W. Ketterle·Dec 23, 2002SaveLearn
Resonant Magnetic VorticesBy using the complex angular momentum method, we provide a semiclassical analysis of electron scattering by a magnetic vortex of Aharonov-Bohm-type. Regge poles of the S-matrix are associated with…Yves Décanini, Antoine Folacci·Dec 23, 2002SaveLearn
Strong enhancement of the valley splitting in a 2D electron system in siliconUsing magnetocapacitance data, we directly determine the chemical potential jump in a strongly correlated 2D electron system in silicon when the filling factor traverses the valley gap at ν=1 and…V. S. Khrapai, A. A. Shashkin, V. T. Dolgopolov·Dec 23, 2002SaveLearn
Changes in the surface electronic structure upon martensitic transformation in TiNi and TiPdThe electronic structure of some low index surfaces for martensitic B19'-TiNi and B19-TiPd were investigated using the full-potential linearized augmented plane wave method. The alteration of the…S. E. Kulkova, V. E. Egorushkin, J. S. Kim et al.·Dec 22, 2002SaveLearn
Coherent Relation between Structure and Conduction of Infinite Atomic WiresWe demonstrate a theoretical analysis concerning the geometrical structures and electrical conduction of infinite monatomic gold and aluminum wires in the process of their elongation, based on…Tomoya Ono, Hideki Yamasaki, Yoshiyuki Egami et al.·Dec 21, 2002SaveLearn
Laser cooling of a trapped two-component Fermi gasThe collective Raman cooling of a trapped two-component Fermi gas is analyzed. We develop the quantum master equation that describes the collisions and the laser cooling, in the festina lente regime,…Z. Idziaszek, L. Santos, M. Baranov et al.·Dec 20, 2002SaveLearn
Correlation functions and momentum distribution of one-dimensional Bose systemsThe ground-state correlation properties of a one-dimensional Bose system described by the Lieb-Liniger Hamiltonian are investigated by using exact quantum Monte Carlo techniques. The pair…G. E. Astrakharchik, S. Giorgini·Dec 20, 2002SaveLearn
Calculation of pure dephasing for excitons in quantum dotsPure dephasing of an exciton in a small quantum dot by optical and acoustic phonons is calculated using the ``independent boson model''. Considering the case of zero temperature the dephasing…E. Pazy·Dec 20, 2002SaveLearn
Images of the Dark Soliton in a Depleted CondensateThe dark soliton created in a Bose-Einstein condensate becomes grey in course of time evolution because its notch fills up with depleted atoms. This is the result of quantum mechanical calculations…Jacek Dziarmaga, Zbyszek P. Karkuszewski, Krzysztof Sacha·Dec 19, 2002SaveLearn
Indirect exchange in GaMnAs bilayers via spin-polarized inhomogeneous hole gas: Monte Carlo simulationThe magnetic order resulting from an indirect exchange between magnetic moments provided by spin-polarized hole gas in the metallic phase of a GaMnAs double layer structure is studied via Monte Carlo…M. A. Boselli, I. C. da Cunha Lima, A. Ghazali·Dec 19, 2002SaveLearn
Negative refraction and left-handed behavior in two-dimensional photonic crystalsWe systematically examine the conditions of obtaining left-handed (LH) behavior in photonic crystals. Detailed studies of the phase and group velocities as well as the phase np and group ng…S. Foteinopoulou, C. M. Soukoulis·Dec 18, 2002SaveLearn
Measuring velocity of sound with nuclear resonant inelastic x-ray scatteringNuclear resonant inelastic x-ray scattering is used to measure the projected partial phonon density of states of materials. A relationship is derived between the low-energy part of this frequency…Michael Y. Hu, Wolfgang Sturhahn, Thomas S. Toellner et al.·Dec 17, 2002SaveLearn
Diphasic non-local model for granular surface flowsConsidering recent results revealing the existence of multi-scale rigid clusters of grains embedded in granular surface flows, i.e. flows down an erodible bed, we describe here the surface flows…D. Bonamy, P. Mills·Dec 17, 2002SaveLearn
Dissipative spin-boson model and Kondo effect in low dimensional quantum gasesWe show that ultracold atoms confined in a quasi-1d trap can be used to study the dissipative spin-boson model with tunable tunneling splitting and strength of dissipation. It is shown that…A. Recati, P. O. Fedichev, W. Zwerger et al.·Dec 17, 2002SaveLearn
Charge Distributions in Metallic Alloys: a Charge Excess Functional theory approachCharge Distributions in Metallic Alloys: a Charge Excess Functional theory approachEzio Bruno·Dec 17, 2002SaveLearn
Evanescent modes stored in cavity resonators with backward-wave slabsAs was shown by N. Engheta, electromagnetic fields in two adjacent slabs bounded by two metal walls can satisfy the boundary conditions even if the distance between the two walls is much smaller than…S. A. Tretyakov, S. I. Maslovski, I. S. Nefedov et al.·Dec 17, 2002SaveLearn
On A Possible Scheme of q-Deformation of Many-Boson Systems in Time-Dependent Variational MethodA possible scheme of q-deformation, which was recently developed by the present authors, is reviewed by stressing the starting idea.A. Kuriyama, C. Providencia, J. da Providencia et al.·Dec 16, 2002SaveLearn
Josephson Current through a correlated quantum level: Andreev states and Pi-junction behaviorThe Josephson transport and the electronic properties of a quantum dot characterized by a single level coupled to superconducting leads is analyzed. Different approximations are used and compared:…E. Vecino, A. Martin-Rodero, A. Levy Yeyati·Dec 16, 2002SaveLearn