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28 papers · 1 filter
Interaction effects at the magnetic-field induced metal-insulator transition in Si/SiGe superlattices
G. Brunthaler, T. Dietl, A. Prinz +7
A metal-insulator transition was induced by in-plane magnetic fields up to 27 T in homogeneously Sb-doped Si/SiGe superlattice structures. The localisation is not observed for perp…
Semiclassical Green Function in Mixed Spaces
Guangcan Yang
A explicit formula on semiclassical Green functions in mixed position and momentum spaces is given, which is based on Maslov's multi-dimensional semiclassical theory. The general f…
Dynamical phase diagram of the dc-driven underdamped Frenkel-Kontorova chain
Maxim Paliy, Oleg Braun, Thierry Dauxois +1
Multistep dynamical phase transition from the locked to the running state of atoms in response to a dc external force is studied by MD simulations of the generalized Frenkel-Kontor…
Density Fluctuations in the Quark-Gluon Plasma
Stanislaw Mrowczynski
Using the kinetic theory we discuss how the particle and energy densities of the quark-gluon plasma fluctuate in a space-time cell. The fluctuations in the equilibrium plasma and i…
Infinite coupling magnon theory of quantum Heisenberg magnetic models of spin s
Bang-Gui Liu, Gerd Czycholl
An infinity magnon coupling term is introduced into the Holstein-Primakoff transformed forms of the Heisenberg ferromagnetic and antiferromagnetic models of any spin to rigorou…
Enhancement of Quantum Tunneling for Excited States in Ferromagnetic Particles
J. -Q. Liang, Y. -B. Zhang, H. J. W. Mueller-Kirsten +3
A formula suitable for a quantitative evaluation of the tunneling effect in a ferromagnetic particle is derived with the help of the instanton method. The tunneling between n-th de…