title: Photon-assisted tunneling through self-assembled InAs quantum dots in the terahertz frequency range.
abstract: 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.
authors.affiliation: Institute of Industrial Science, University of Tokyo, Komaba, Meguro-ku, Japan. kshibata@iis.u-tokyo.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Shibata
authors.forename: A
authors.initials: A
authors.lastname: Umeno
authors.forename: K M
authors.initials: KM
authors.lastname: Cha
authors.forename: K
authors.initials: K
authors.lastname: Hirakawa