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arXiv · 1003.3403

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

Vadim Puller·Yigal Meir
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Abstract

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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Vadim Puller, Yigal Meir. 2010-03-17. How to Measure the Transmission Phase via a Quantum Dot in a Two-Terminal Interferometer. https://doi.org/10.1103/physrevlett.104.256801

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