How to Measure the Transmission Phase via a Quantum Dot in a Two-Terminal Interferometer

Details How to Measure the Transmission Phase via a Quantum Dot in a Two-Terminal Interferometer How to Measure the Transmission Phase via a Quantum Dot in a Two-Terminal Interferometer

2010-03-17

arxiv.org/abs/1003.3403v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

Measurement of the transmission phase through a quantum dot (QD) embedded in an arm of a two-terminal Aharonov-Bohm (AB) interferometer is inhibited by phase symmetry, i.e. the property that the linear response conductance of a two-terminal device is an even function of magnetic field. It is demonstrated that in a setup consisting of an interferometer with a QD in each of its arms, with one of the QDs capacitively coupled to a nearby quantum point contact (QPC), phase symmetry is broken when a finite voltage bias is applied to the QPC. The transmission phase via the uncoupled QD can then be deduced from the amplitude of the odd component of the AB oscillations.

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