Combined description for semiclassical and quantum transport in superlattices
Combined description for semiclassical and quantum transport in superlattices
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超晶格中半经典和量子输运的联合描述
DOI：
10.1103/physrevb.59.7334
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
G. Döhler
中科院分区：
文献类型：
--
作者：
S. Rott;P. Binder;N. Linder;G. Döhler
强耦合超晶格中的直流电流既可以用半经典的能带输运理论来描述，也可以用基于Wannier-Stark阶梯局域波函数之间跳跃跃迁的量子力学理论来描述。我们证明了这两种模型的等效性在布洛赫振荡电子的领域制度。结合这两幅图，我们计算了由Wannier-Stark能级间的微观声子散射引起的超晶格漂移速度。我们的研究结果表明，以前的讨论的漂移速度的温度依赖性进行了彻底的修订。
The dc current in strongly coupled superlattices can either be described in a semiclassical picture in terms of miniband transport or in a quantum mechanical theory based on hopping transitions between the localized wave functions of the Wannier-Stark ladder. We demonstrate the equivalence of both models in the field regime of Bloch-oscillating electrons. Combining these two pictures we calculate the superlattice drift velocity resulting from microscopic phonon scattering between the Wannier-Stark levels. Our results show that previous discussions of the temperature dependence of the drift velocity have to be revised drastically.