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Giant Terahertz Photoconductance of Quantum Point Contacts in the Tunneling Regime

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Otteneder, M. ; Kvon, Z. D. ; Tkachenko, O. A. ; Tkachenko, V. A. ; Jaroshevich, A. S. ; Rodyakina, E. E. ; Latyshev, A. V. ; Ganichev, Sergey
Date of publication of this fulltext: 18 Jul 2019 13:52


We report on the observation of the giant photoconductance of a quantum point contact (QPC) in the tunneling regime excited by terahertz radiation. Studied QPCs are formed in a GaAs/(Al, Ga) As heterostructure with a high-electron-mobility two-dimensional electron gas. We demonstrate that irradiation of strongly negatively biased QPCs by laser radiation with frequency f = 0.69 THz and intensity ...


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