Zobrazeno 1 - 10
of 125
pro vyhledávání: '"Ludwig Schweitzer"'
Autor:
Ludwig Schweitzer
Publikováno v:
International Journal of Modern Physics B. 21:5231-5235
We consider non-interacting electrons moving on a two-dimensional square lattice in the presence of quenched correlated disorder potentials and a perpendicular magnetic field with flux density close to 1/2h/e per plaquette. In this situation, the ind
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c1ce742f17ad056167e7ec0be0f0c6b2
https://doi.org/10.1142/s0217979207038332
https://doi.org/10.1142/s0217979207038332
Autor:
Ludwig Schweitzer, Peter Markos
Publikováno v:
Journal of Physics A: Mathematical and General. 39:3221-3230
The critical two-terminal conductance $g_c$ and the spatial fluctuations of critical eigenstates are investigated for a disordered two dimensional model of non-interacting electrons subject to spin-orbit scattering (Ando model). For square samples, w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a8408ab9e629618b4526036a0f294144
https://doi.org/10.1088/0305-4470/39/13/003
https://doi.org/10.1088/0305-4470/39/13/003
Autor:
Hans Bachmair, Ernst O. Göbel, J. Melcher, Jürgen Schurr, Ludwig Schweitzer, B. Schumacher, P. Warnecke, G. Hein
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 20:14-23
The present state of the art of reproducing the SI unit for the electrical resistance, the ohm, by the quantum Hall effect is summarised including recent developments like quantum Hall arrays and AC measurements of the quantum Hall effect and their a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1279ccb0eb1a0da1dd241fddf960e9d1
https://doi.org/10.1016/j.physe.2003.09.017
https://doi.org/10.1016/j.physe.2003.09.017
Publikováno v:
Journal of Physics: Condensed Matter. 15:5073-5078
In this report we demonstrate that the width of the spin-split plateaus of the integer quantum Hall effect are determined by the quantum lifetime of the electrons via the exchange interaction. The widths of the adjacent Landau-split plateaus are a co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::012c61981e7cdc99694b5ecd3473cc20
https://doi.org/10.1088/0953-8984/15/29/318
https://doi.org/10.1088/0953-8984/15/29/318
Publikováno v:
Physical Review Letters. 86:3863-3866
The disorder driven quantum Hall to insulator transition is investigated for a two-dimensional lattice model. The Hall conductivity and the localization length are calculated numerically near the transition. For uncorrelated and weakly correlated dis
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d354c3e2f96f8a2b9d0d12218e02be55
https://doi.org/10.1103/physrevlett.86.3863
https://doi.org/10.1103/physrevlett.86.3863
Publikováno v:
Physica A: Statistical Mechanics and its Applications. 266:76-80
We show that the method of level statistics can be applied successfully to investigate the localization behavior of vibrations and spin-wave states on the infinite percolation cluster for p⩾pc. The fluctuations of the density of states are well des
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c1ccdb8f1820a1ef2866335340f9d62c
https://doi.org/10.1016/s0378-4371(98)00578-0
https://doi.org/10.1016/s0378-4371(98)00578-0
Autor:
Ludwig Schweitzer, Peter Markos
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 40:1335-1337
The two-terminal conductance of a random flux model defined on a square lattice is investigated numerically at the band center using a transfer matrix method. Due to the chiral symmetry, there exists a critical point where the ensemble averaged mean
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f1b53c0e84cb4e545da7575583d6911d
https://doi.org/10.1016/j.physe.2007.08.083
https://doi.org/10.1016/j.physe.2007.08.083
Autor:
Ludwig Schweitzer, H. Potempa
Publikováno v:
Annalen der Physik. 510:457-461
We investigate numerically the influence of Dirichlet boundary conditions on the nearest neighbor level spacing distribution $P(s)$ of a two-dimensional disordered tight-binding model in the presence of a strong perpendicular magnetic field. From the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::91715f54c01d77a88315aeb58d2840eb
https://doi.org/10.1002/andp.199851005-614
https://doi.org/10.1002/andp.199851005-614
Publikováno v:
Physica B: Condensed Matter. :792-795
Using the method of energy-level statistics, the localization properties of electrons moving in two dimensions in the presence of a perpendicular random magnetic field and additional random disorder potentials are investigated. For this model, extend
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::77bbdf7401732ca6f4e43c8cbe33fb32
https://doi.org/10.1016/s0921-4526(98)00316-0
https://doi.org/10.1016/s0921-4526(98)00316-0
Autor:
Ludwig Schweitzer, I. Kh. Zharekeshev
Publikováno v:
Journal of Physics: Condensed Matter. 7:L377-L381
The energy level statistics of 2D electrons with spin-orbit scattering are considered near the disorder induced metal-insulator transition. Using the Ando model, the nearest-level-spacing distribution is calculated numerically at the critical point.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6182333565eb0200bd0a2d54e9ce7378
https://doi.org/10.1088/0953-8984/7/28/002
https://doi.org/10.1088/0953-8984/7/28/002