Exciton magnetotransport in two-dimensional systems: Weak-localization effects
Exciton magnetotransport in two-dimensional systems: Weak-localization effects
复制标题
二维系统中的激子磁输运：弱局域化效应
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
A. Dzyubenko
中科院分区：
文献类型：
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作者：
P. I. Arseev;A. Dzyubenko
研究了磁场B对弱无序二维系统中中性复合粒子即激子输运的影响。在经典输运情况下（当忽略不同路径的干扰时），磁场抑制激子输运，静态扩散常数D（B）随B单调下降。当考虑由于弱局域化引起的量子力学修正时，D（B）成为B的非单调函数。在弱磁场中，当磁长度远大于激子玻尔半径时，预测了正的磁扩散效应，即：ε B=（ε c/e B）1/2 ε a B =ε c/μ e 2，激子迁移率应该随着B而增加。
The paper considers the effect of a magnetic field B on the transport of neutral composite particles, namely excitons, in weakly disordered two-dimensional (2D) systems. In the case of classical transport (when the interference of different paths is neglected), the magnetic field suppresses exciton transport, and the static diffusion constant D(B) monotonically drops with B. When quantum-mechanical corrections due to weak localization are taken into account, D(B) becomes a nonmonotonic function of B. In weak magnetic fields, where the magnetic length is much larger than the exciton Bohr radius, ℓB=(ℏc/eB)1/2≫aB=ε ℏ2/μe2,a positive magnetodiffusion effect is predicted, i.e., the exciton mobility should increase with B.