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TT: Tiefe Temperaturen
TT 4: Eigenschaften mesoskopischer Systeme
TT 4.9: Talk
Monday, March 22, 1999, 18:15–18:30, F1
Phase correlations in the transmission through a disordered quantum dot — •R. Baltin1 and Y. Gefen2 — 1MPI f"ur Kernphysik, Postfach 103980, 69029 Heidelberg — 2The Weizmann Institute of Science, Rehovot 76100, Israel
We study the properties of the phase of the transmission amplitude through a disordered, interacting system. Specifically, we look at a quantum dot in the Coulomb blockade regime. Recently, this quantity became experimentally accessible [1]. Using the constant interaction model and random matrix theory for the single particle levels of the quantum dot, we calculate the phase dependence on gate voltage for a given disorder configuration. We observe an increase of the phase by π at the Coulomb blockade resonances, and drops by π (”phase lapses”) between the resonances. We identify different mechanisms for these phase lapses. By averaging over the disorder configurations the phase-phase correlation function depending on gate voltage is obtained. We find interaction–induced correlations between the phases at different gate voltages.
[1] R. Schuster, E. Buks, M. Heiblum, D. Mahalu, V. Umansky, H. Shtrikman: Nature 385, 417 (1997).