Photon-assisted tunneling through self-assembled InAs quantum dots in the terahertz frequency range

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 magnitud...

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Bibliographic Details
Published inPhysical review letters Vol. 109; no. 7; p. 077401
Main Authors Shibata, K, Umeno, A, Cha, K M, Hirakawa, K
Format Journal Article
LanguageEnglish
Published United States 16.08.2012
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Summary: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.
ISSN:1079-7114
DOI:10.1103/physrevlett.109.077401