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Phase coherence in the Inelastic Cotunneling Regime

DOI to cite this document:
10.5283/epub.1794
Sigrist, Martin ; Ihn, Thomas ; Ensslin, Klaus ; Loss, Daniel ; Reinwald, Matthias ; Wegscheider, Werner
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Date of publication of this fulltext: 05 Aug 2009 13:32


Abstract

Two quantum dots with tunable mutual tunnel coupling have been embedded in a two-terminal Aharonov-Bohm geometry. Aharonov-Bohm oscillations investigated in the cotunneling regime demonstrate coherent tunneling through nonresonant states. Visibilities of more than 0.8 are measured indicating that phase-coherent processes are involved in the elastic and inelastic cotunneling. An oscillation-phase change of is detected as a function of bias voltage at the inelastic cotunneling onset.


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