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10 papers · 1 filter
Spin relaxation in quantum Hall systems
W. Apel, Yu. A. Bychkov
We study the spin relaxation in an interacting two--dimensional electron gas in a strong magnetic field for the case that the electron density is close to filling just one Landau s…
Path Integral for Composite Fermions in the Half-Filled Lowest Landau Level
W. Weller, J. Dietel, Th. Koschny +1
We consider electrons in two dimensions in a strong magnetic field at half filling of the lowest Landau level using the Chern-Simons approach. Starting from a lattice Hamiltonian f…
Critical level statistics of a quantum Hall system with Dirichlet boundary conditions
H. Potempa, L. Schweitzer
We investigate numerically the influence of Dirichlet boundary conditions on the nearest neighbor level spacing distribution of a two-dimensional disordered tight-binding mo…
Extended Fractons and Localized Phonons on Percolation Clusters
Jan W. Kantelhardt, Armin Bunde, L. Schweitzer
We investigate the localization behavior of vibrational modes of infinite percolation clusters above the critical concentration in two and three dimensions using the method of leve…
Quantum-Hall to insulator transition
H. Potempa, A. Bäker, L. Schweitzer
The crossover from the quantum Hall regime to the Hall-insulator is investigated by varying the strength of the diagonal disorder in a 2d tight-binding model. The Hall and longitud…
Dependence of critical level statistics on the sample shape
H. Potempa, L. Schweitzer
The level-spacing distribution of consecutive energy eigenvalues is calculated numerically at the metal insulator transition for 3d systems with different cuboid shapes. It is foun…