Measurement quantum mechanics and experiments on quantum Zeno effectMeasurement quantum mechanics, the theory of a quantum system which undergoes a measurement process, is introduced by a loop of mathematical equivalencies connecting previously proposed approaches.…Carlo Presilla, Roberto Onofrio, Ubaldo Tambini·Mar 28, 1996SaveLearn
System of 2 Derrida's models with fixed correlation between the spin configurations of subsystemsThe free energy and finite size effects are calculated for the system of 2 Derrida's models with fixed constraint between the spin configurations. Calculation were performed for the Random Energy…A. Allakhverdian, D. Saakian·Mar 28, 1996SaveLearn
Jellium correction to the critical condition of cluster fission within a Liquid Drop ModelJellium correction on the fissionability parameter is estimated within a Liquid Drop Model of the charged metallic cluster. This correction modifies the critical condition of fission and, it becomes…F. Despa·Mar 28, 1996SaveLearn
Distribution of the Absorption by Chaotic States in Quantum DotsThe mesoscopic fluctuations of the absorption at optical transitions from a low energy regular state to high energy chaotic states in an aggregate of semiconductor quantum dots is studied. We provide…Nobuhiko Taniguchi, Vladimir N. Prigodin·Mar 28, 1996SaveLearn
Kinetics of a Diffusive Capture Process: Lamb Besieged by a Pride of LionsThe survival probability, SN(t), of a diffusing prey (``lamb'') in the proximity of N diffusing predators (a ``pride of lions'') in one dimension is investigated. When the lions are…P. L. Krapivsky, S. Redner·Mar 28, 1996SaveLearn
An Anderson Impurity in a SemiconductorWe study an Anderson impurity in a semiconducting host using the density matrix renormalization group technique. We use the U=0 one--dimensional Anderson Hamiltonian at half filling as the…Clare C. Yu, M. Guerrero·Mar 27, 1996SaveLearn
Temperature Dependence of the Spin-Peierls Energy Gap and Anomalous Line Shapes in CuGeO3Neutron scattering measurements on a large single crystal of CuGeO3 have been used to determine the temperature-dependence of the spin-Peierls energy gap. While the power law behavior of the…Michael C. Martin, G. Shirane, Y. Fujii et al.·Mar 27, 1996SaveLearn
Dynamical Generation of Extended Objects in a 1+1 Dimensional Chiral Field Theory: Non-Perturbative Dirac Operator Resolvent AnalysisWe analyze the 1+1 dimensional Nambu-Jona-Lasinio model non-perturbatively. In addition to its simple ground state saddle points, the effective action of this model has a rich collection of…J. Feinberg, A. Zee·Mar 27, 1996SaveLearn
The asymmetric exclusion model with sequential updateWe present a solution for the stationary state of an asymmetric exclusion model with sequential update and open boundary conditions. We solve the model exactly for random hopping in both directions…N. Rajewsky, A. Schadschneider, M. Schreckenberg·Mar 27, 1996SaveLearn
Effect of noise for two interacting particles in a random potentialWe investigated the effect of noise on propagation of two interacting particles pairs in a quasi one--dimensional random potential. It is shown that pair diffusion is strongly enhanced by short range…Fausto Borgonovi, Dima L. Shepelyansky·Mar 27, 1996SaveLearn
Operator Spectrum and Exact Exponents of the Fully Packed Loop ModelWe develop a Coulomb gas description of the critical fluctuations in the fully packed loop model on the honeycomb lattice. We identify the complete operator spectrum of this model in terms of…Jané Kondev, Jan de Gier, Bernard Nienhuis·Mar 27, 1996SaveLearn
Disordered Critical Wave functions in Random Bond Models in Two Dimensions -- Random Lattice Fermions at E=0 without DoublingRandom bond Hamiltonians of the π flux state on the square lattice are investigated. It has a special symmetry and all states are paired except the ones with zero energy. Because of this, there are…Yasuhiro Hatsugai, Xiao-Gang Wen, Mahito Kohmoto·Mar 27, 1996SaveLearn
A Novel Monte Carlo Approach to the Dynamics of Fluids --- Single Particle Diffusion, Correlation Functions and Phase Ordering of Binary FluidsWe propose a new Monte Carlo scheme to study the late-time dynamics of a 2-dim hard sphere fluid, modeled by a tethered network of hard spheres. Fluidity is simulated by breaking and reattaching the…P. B. Sunil Kumar, Madan Rao·Mar 27, 1996SaveLearn
The Flat Phase of Crystalline MembranesWe present the results of a high-statistics Monte Carlo simulation of a phantom crystalline (fixed-connectivity) membrane with free boundary. We verify the existence of a flat phase by examining…M. Bowick, S. Catterall, M. Falcioni et al.·Mar 26, 1996SaveLearn
Spectral Statistics at the Anderson Transition: Multifractality of Wave Functions and the Violation of the Normalization Sum RuleThe statistics of energy levels of electrons in a random potential is considered in the critical energy window near the mobility edge. It is shown that the multifractality of critical wave functions…V. E. Kravtsov·Mar 26, 1996SaveLearn
Localization transitions in non-Hermitian quantum mechanicsWe study the localization transitions which arise in both one and two dimensions when quantum mechanical particles described by a random Schrödinger equation are subjected to a constant imaginary…Naomichi Hatano, David R. Nelson·Mar 26, 1996SaveLearn
Bond-charge Interaction in the extended Hubbard chainWe study the effects of bond-charge interaction (or correlated hopping) on the properties of the extended ( i.e., with both on-site (U) and nearest-neighbor (V) repulsions) Hubbard model in…Daisy M. Luz, Raimundo R. dos Santos·Mar 26, 1996SaveLearn
Low density ferromagnetism in the Hubbard modelA single-band Hubbard model with nearest and next-nearest neighbour hopping is studied for d=1, 2, 3, using both analytical and numerical techniques. In one dimension, saturated ferromagnetism is…P. Pieri, S. Daul, D. Baeriswyl et al.·Mar 26, 1996SaveLearn
Symmetrized DMRG Method for Excited States of Hubbard ModelsWe extend the density matrix renormalization group method to exploit Parity, C2 (rotation by π) and electron-hole symmtries of model Hamiltonians. We demonstrate the power of this method by…S. Ramasesha, Swapan K. Pati, H. R. Krishnamurthy et al.·Mar 26, 1996SaveLearn
"Electro-flux" effect in superconducting hybrid Aharonov-Bohm ringsWe have extended the circuit theory of Andreev conductance [Phys.~Rev.~Lett. 73, 1420 (1994)] to diffusive superconducting hybrid structures that contain an Aharonov-Bohm ring. The…T. H. Stoof, Yu. V. Nazarov·Mar 26, 1996SaveLearn
Spin Diffusion in 2D XY Ferromagnet with Dipolar InteractionIn the ordered phase of 2D XY ferromagnet the dipolar interaction between spins induces a strong, relevant interaction between spin-waves. We study quasi-excitations of the interacting spin-wave…A. Kashuba, Ar. Abanov, V. L. Pokrovsky·Mar 26, 1996SaveLearn
Directed polymers in a random medium: a variational approachA disorder-dependent Gaussian variational approach is applied to the problem of a d dimensional polymer chain in a random medium (or potential). Two classes of variational solutions are obtained.…T. Garel, H. Orland·Mar 26, 1996SaveLearn
How to bosonize fermions with non-linear energy dispersionWe develop a systematic method to treat the effect of non-linearity in the energy dispersion on the usual bosonization result for the single-particle Green's function of fermions in arbitrary…Peter Kopietz, Guillermo E. Castilla·Mar 26, 1996SaveLearn
Modular Invariance, Self-Duality and The Phase Transition Between Quantum Hall PlateausWe investigate the problem of the superuniversality of the phase transition between different quantum Hall plateaus. We construct a set of models which give a qualitative description of this…Eduardo Fradkin, Steven Kivelson·Mar 25, 1996SaveLearn
Novel correlations in two dimensions: Some exact solutionsWe construct a new many-body Hamiltonian with two- and three-body interactions in two space dimensions and obtain its exact many-body ground state for an arbitrary number of particles. This ground…M. V. N. Murthy, R. K. Bhaduri, Diptiman Sen·Mar 25, 1996SaveLearn