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12 papers · 1 filter
Noise in an ac biased junction. Non-stationary Aharonov-Bohm effect
L. S. Levitov, G. B. Lesovik
We study excess noise in a quantum conductor in the presence of constant voltage and alternating external field. Due to a two particle interference effect caused by Fermi correlati…
Life-Times of Simulated Traffic Jams
K. Nagel
We study a model for freeway traffic which includes strong noise taking into account the fluctuations of individual driving behavior. The model shows emergent traffic jams with a s…
Exact calculation of the ground-state dynamical spin correlation function of a S=1/2 antiferromagnetic Heisenberg chain with free spinons
F. D. M. Haldane, M. R. Zirnbauer
We calculate the exact dynamical magnetic structure factor S(Q,E) in the ground state of a one-dimensional S=1/2 antiferromagnet with gapless free S=1/2 spinon excitations, the Hal…
Avalanches and Correlations in Driven Interface Depinning
Heiko Leschhorn, Lei-Han Tang
We study the critical behavior of a driven interface in a medium with random pinning forces by analyzing spatial and temporal correlations in a lattice model recently proposed by S…
Matrix-product-groundstates for one-dimensional spin-1 quantum antiferromagnets
A. Klümper, A. Schadschneider, J. Zittartz
We have found the exact groundstate for a large class of antiferromagnetic spin-1 models with nearest-neighbour interactions on a linear chain. All groundstate properties can be ca…
Thermodynamics of the Anisotropic Spin-1/2 Heisenberg Chain and Related Quantum Chains
Andreas Klümper
The free energy and correlation lengths of the spin-1/2 chain are studied at finite temperature. We use the quantum transfer matrix approach and derive non-linear integral eq…