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

被引：70

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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