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Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
Transmission phase lapses through a quantum dot in a strong magnetic field
Yehuda Dinaii1, Yuval Gefen1, Bernd Rosenow2
1Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.
Abstract:
The phase of the transmission amplitude through a mesoscopic system contains information about the system's quantum mechanical state and excitations thereof. In the absence of an external magnetic field, abrupt phase lapses occur between transmission resonances of quantum dots and can be related to the signs of tunneling matrix elements. They are smeared at finite temperatures. By contrast, we show here that in the presence of a strong magnetic field, phase lapses represent a genuine interaction effect and may occur also on resonance. We identify a relevant physical regime where these phase lapses are robust against finite temperature broadening.
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