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

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

Shibata, K; Umeno, A; Cha, K M; Hirakawa, K

Physical review letters, 08/2012, Volume: 109, Issue: 7

Journal Article

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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Shibata, K | Umeno, A | Cha, K M | Hirakawa, K

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