Control of the transmission phase in an asymmetric four-terminal Aharonov-Bohm interferometer

Details Control of the transmission phase in an asymmetric four-terminal Aharonov-Bohm interferometer Control of the transmission phase in an asymmetric four-terminal Aharonov-Bohm interferometer

2010-05-12

arxiv.org/abs/1005.2081v1

Phys. Rev. B 82, 045432 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 4 figures

Scientific paper

10.1103/PhysRevB.82.045432

Phase sensitivity and thermal dephasing in coherent electron transport in quasi one-dimensional (1D) waveguide rings of an asymmetric four-terminal geometry are studied by magnetotransport measurements. We demonstrate the electrostatic control of the phase in Aharonov-Bohm (AB) resistance oscillations and investigate the impact of the measurement circuitry on decoherence. Phase rigidity is broken due to the ring geometry: Orthogonal waveguide cross-junctions and 1D leads minimize reflections and resonances between leads allowing for a continuous electron transmission phase shift. The measurement circuitry influences dephasing: Thermal averaging dominates in the non-local measurement configuration while additional influence of potential fluctuations becomes relevant in the local configuration.

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