Density of states of disordered systems with a finite correlation length
Density of states of disordered systems with a finite correlation length
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具有有限相关长度的无序系统的状态密度
DOI：
10.1103/physrevb.73.125115
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发表时间：
2005
影响因子：
3.7
通讯作者：
M. Hilke
中科院分区：
文献类型：
--
作者：
J. C. Flores;M. Hilke
考虑任意维无序系统的态密度（DOS）的半经典公式。结果表明，当失序势的相关长度较大时，该公式变得非常准确。失序势是分段常数，并不局限于失序较小的摄动状态。DOS用无序分布函数和非无序DOS的卷积来表示。我们应用这种形式来评价朗道能级的展宽和计算无序系统的比热。
We consider a semiclassical formulation for the density of states (DOS) of disordered systems in any dimension. We show that this formulation becomes very accurate when the correlation length of the disorder potential is large. The disorder potential is piecewise constant and is not limited to the perturbative regime, where the disorder is small. The DOS is expressed in terms of a convolution of the disorder distribution function and the nondisordered DOS. We apply this formalism to evaluate the broadening of Landau levels and to calculate the specific heat in disordered systems.