Phase coherence in the inelastic cotunneling regime
M. Sigrist, T. Ihn, K. Ensslin, D. Loss, M. Reinwald, W. Wegscheider
Abstract
Two quantum dots with tunable mutual tunnel coupling have been embedded in a two-terminal Aharonov-Bohm geometry. Aharonov-Bohm oscillations are investigated in the cotunneling regime. 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 pi is detected as a function of bias voltage at the inelastic cotunneling onset.
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