Pump-energy dependence of usual and unusual Bloch oscillations in a GaAs/AlAs superlattice

被引：0
|
作者：
Hasegawa, T. [1 ]
Mizoguchi, K. [2 ]
Nakayama, M. [1 ]
机构：
[1] Osaka City Univ, Grad Sch Engn, Dept Appl Phys, Sumiyoshi Ku, 3-3-138 Sugimoto, Osaka 5588585, Japan
[2] Osaka Prefecture Univ, Grad Sch Sci, Dept Phys Sci, Osaka 5998531, Japan
来源：
PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 6, NO 1 | 2009年 / 6卷 / 01期
基金：
日本学术振兴会;
关键词：
SEMICONDUCTOR SUPERLATTICE; ELECTRIC-FIELD; STARK LOCALIZATION; LADDER;
D O I：
10.1002/pssc.200879822
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have systematically investigated the wave-packet dynamics of Bloch oscillations (BOs) from the viewpoint of the characteristics of the Wannier-Stark (WS) localization states in a GaAs (6.8 nm)/AlAs (0.9 nm) superlattice embedded in a p-i-n diode structure, The coherent oscillations were detected with a reflection-type pump-probe technique. It is clearly confirmed that the unusual BO with the frequency of 2eFD/h occurs in a weak localization regime in addition to the usual BO with eFD/h in a strong localization regime, where F is the applied electric field, and D is the superlattice period. The systematic results of the pump-probe measurements as a function of pump energy indicate that the intensity of the unusual BO is drastically changed with pump energy, while a gradual change of that of the usual BO is observed, These results demonstrate that the quantum interference leading to the usual BO with 2eFD/h is much sensitive to the pump energy compared with that of the usual BO. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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页码：264 / +
页数：2
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