Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 6: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 1
TT 6.3: Talk
Monday, March 26, 2012, 10:00–10:15, BH 334
Influence of Coulomb interaction on the Aharonov-Bohm effect in an electronic Fabry-Pérot interferometer — •Stéphane Ngo Dinh1 and Dmitry Bagrets2,3 — 1Institut für Theorie der Kondensierten Materie and DFG Center for Functional Nanostructures, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — 2Institut für Nanotechnologie, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany — 3Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
We study the role of Coulomb interaction in an electronic Fabry-Pérot interferometer (FPI) realized with chiral edge states in the integer quantum Hall regime in the limit of weak backscattering.
Assuming that a compressible Coulomb island in a bulk region of the FPI is formed, we develop a capacitance model which explains the plethora of experimental data on the flux and gate periodicity of conductance oscillations. It is also shown that a suppression of finite-bias visibility stems from a combination of weak Coulomb blockade and a nonequilibrium dephasing by the quantum shot noise.