Giant mesoscopic photoconductance fluctuations in Ge/Si quantum dot system | Zendy

N. P. Stepina | Zendy; E.S. Koptev | Zendy; А. В. Двуреченский | Zendy; А. И. Никифоров | Zendy; J. Gerharz | Zendy; J. Moers | Zendy; D. Gruetzmacher | Zendy

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Giant mesoscopic photoconductance fluctuations in Ge/Si quantum dot system

Author(s) -

N. P. Stepina,

E.S. Koptev,

А. В. Двуреченский,

А. И. Никифоров,

J. Gerharz,

J. Moers,

D. Gruetzmacher

Publication year - 2011

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.3574022

Subject(s) - mesoscopic physics , quantum dot , condensed matter physics , excitation , conductance , photon , photoconductivity , wavelength , physics , materials science , optoelectronics , optics , quantum mechanics

We studied the impact of weak photon flux on the electron transport in strongly localized quantum dot system. Exploring devices with narrow transport channels lead to the observation of giant fluctuations of the photoconductance, which is attributed to the strong dependence of hopping current on the filling of dots by holes. This phenomenon has the potential to detect a single photoexcited carrier for a wide range of wavelength. In our experiments, single-photon mode operation is indicated by the linear dependence of the frequency of photoinduced fluctuations on the light intensity and the steplike response of conductance on the pulse excitation. (C) 2011 American Institute of Physics. [doi:10.1063/1.3574022

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