Phys. Rev. Lett. 104, 256801 (2010) [4 pages]

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

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Vadim I. Puller1 and Yigal Meir1,2
1Department of Physics, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
2The Ilse Katz Center for Meso- and Nano-scale Science and Technology, Ben-Gurion University, Beer Sheva 84105, Israel

Received 17 March 2010; published 23 June 2010

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 the 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.

© 2010 The American Physical Society

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