Mesoscopic photovoltaic effect in GaAsGa1xAlxAs Aharonov-Bohm rings

L. Angers, A. Chepelianskii, R. Deblock, B. Reulet, and H. Bouchiat
Phys. Rev. B 76, 075331 – Published 16 August 2007

Abstract

When submitted to a high-frequency radiation at low temperature, a mesoscopic conductor develops a sample specific dc voltage. We have investigated this photovoltaic (PV) effect on GaAsGa1xAlxAs Aharonov-Bohm rings at temperatures varying between 30mK and 1K. The rf induced PV voltage is a purely mesoscopic effect which exhibits both periodic and aperiodic magnetic flux dependences with zero average value. The harmonics content and symmetry of this flux dependent PV voltage close to zero field depend on the radiation frequency compared to the inverse diffusion time around the sample. The frequency dependence also exhibits sharp resonances which position sign and amplitude strongly depend on magnetic field. We attribute these resonances to the presence of two level systems at resonance with the frequency of the electromagnetic field.

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  • Received 6 April 2007

DOI:https://doi.org/10.1103/PhysRevB.76.075331

©2007 American Physical Society

Authors & Affiliations

L. Angers, A. Chepelianskii, R. Deblock, B. Reulet, and H. Bouchiat

  • Université Paris-Sud, CNRS, UMR 8502, F-91405 Orsay Cedex, France

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Issue

Vol. 76, Iss. 7 — 15 August 2007

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