Photon-Assisted Tunneling through Self-Assembled InAs Quantum Dots in the Terahertz Frequency Range

被引：69
作者：
Shibata, K. [1 ,2 ]
Umeno, A. [1 ]
Cha, K. M. [1 ]
Hirakawa, K. [1 ,2 ,3 ]
机构：
[1] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan
[2] Univ Tokyo, Inst Nano Quantum Informat Elect, Meguro Ku, Tokyo 1538505, Japan
[3] CREST JST, Kawaguchi, Saitama 3320012, Japan
来源：
PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 07期
基金：
日本学术振兴会;
关键词：
SPIN;
D O I：
10.1103/PhysRevLett.109.077401
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have investigated terahertz (THz) photon-assisted tunneling in single self-assembled InAs quantum dots (QDs). Two types of photon-assisted tunneling processes have been observed in the THz range: ground state resonance and photon-induced excited state resonance, depending on the relative magnitude between the orbital quantization energy of the QDs and the THz photon energy. Furthermore, we could realize a very high coupling efficiency between THz waves and QDs and observed multiphoton absorption up to the fourth-order during the tunneling process, resulting in almost complete lifting of the Coulomb blockade.
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页数：5
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