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Summary: Abstracts
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Mesoscopic Physics and Nanophysics
Phase evolution of a few electrons QD
M. Avinun-Kalish, M. Heiblum, D. Mahalu, and V. Umansky
Braun Center for Submicron Research, Department of Condensed Matter Physics,
Weizmann Institute of Science, Rehovot 76100, Israel
Email: havinun@wisemail.weizmann.ac.il
Studying the phase evolution of the transmission or re
ection coeÆcients leads to
new information, not provided by the absolute values of the transmission coeÆcients
given by conductance measurements. Experiments with a double path interferometer
where a quantum dot (QD) incorporated in one of its arms allowed the determination
of coherence and the measurement of the actual phase of the transmission coeÆcient
through the QD. The phase increases from 0 to along a Coulomb blockaded con-
ductance peak, and drops abruptly back to zero between the peaks. This evolution
is repetitious as the number of electrons increases for many consecutive peaks. This
behavior is unexpected and presents a puzzle. Some of the proposed explanations
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