Interaction of Wannier-Stark ladders and electrical breakdown in superlattices

被引：32

作者：

Glutsch, S ^{[1
]}

Bechstedt, F ^{[1
]}

机构：

[1] Univ Jena, Inst Festkorpertheorie & Theoret Opt, D-07743 Jena, Germany

来源：

PHYSICAL REVIEW B | 1999年 / 60卷 / 24期

关键词：

D O I：

10.1103/PhysRevB.60.16584

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study optical transitions of strongly coupled GaAs/(Ga,Al)As superlattices in an electric field. With progressing field strength we observe (i) the interference of Wannier-Stark and Franz-Keldysh oscillations; (ii) Wannier-Stark ladders belonging to the first and second allowed transition; (iii) nondiagonal Wannier-Stark transitions and anticrossings of different levels; and (iv) a Zener breakdown with removal of ail sharp transitions. We demonstrate that the standard approximation of the eigenstates by Kane functions is valid only for small fields; for intermediate fields quantitative and qualitative differences to the exact solution are noticed; and the electrical breakdown at high fields cannot be described by Kane functions. [S0163-1829(99)04648-2].

引用

页码：16584 / 16590

页数：7

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