Struck Alexander, Kramer Bernhard
I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany.
Phys Rev Lett. 2006 Sep 8;97(10):106801. doi: 10.1103/PhysRevLett.97.106801. Epub 2006 Sep 5.
The compressibility of a two-dimensional electron system with spin in a spatially correlated random potential and a quantizing magnetic field is investigated. Electron-electron interaction is treated with the Hartree-Fock method. Numerical results for the influences of interaction and disorder on the compressibility as a function of the particle density and the strength of the magnetic field are presented. Localization-delocalization transitions associated with a highly compressible region in the energy spectrum are found at half-integer filling factors. Coulomb blockade effects are found near integer fillings in the regions of low compressibility. Results are compared with recent experiments.
研究了具有自旋的二维电子系统在空间相关随机势和量子化磁场中的压缩性。采用哈特里-福克方法处理电子-电子相互作用。给出了相互作用和无序对作为粒子密度和磁场强度函数的压缩性影响的数值结果。在半整数填充因子处发现了与能谱中高压缩区域相关的局域化-退局域化转变。在低压缩性区域的整数填充附近发现了库仑阻塞效应。将结果与近期实验进行了比较。
