Phys. Rev. Lett. 90, 156802 (2003) [4 pages]Measuring the Transmission Phase of a Quantum Dot in a Closed InterferometerReceived 17 November 2002; published 16 April 2003 The electron transmission through a closed Aharonov-Bohm mesoscopic solid-state interferometer, with a quantum dot (QD) on one of the paths, is calculated exactly for a simple model. Although the conductance is an even function of the magnetic flux (due to Onsager’s relations), in many cases one can use the measured conductance to extract both the amplitude and the phase of the “intrinsic” transmission amplitude tD=-i|tD|eiαD through the “bare” QD. We also propose to compare this indirect measurement with the (hitherto untested) direct relation sin2(αD)≡|tD|2/max(|tD|2). © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.156802
DOI:
10.1103/PhysRevLett.90.156802
PACS:
73.63.–b, 03.75.–b, 78.67.Hc, 85.35.Ds
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