Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 9: Quantum Dots, Quantum Wires, Point Contacts
TT 9.10: Vortrag
Montag, 12. März 2018, 12:15–12:30, HFT-FT 101
Shot Noise and electron pairing in integer quantum Hall interferometers — •Giovanni Andrea Frigeri1,3, Daniel D. Scherer2, and Bernd Rosenow3 — 1MPI for Mathematics in the Sciences, Leipzig, Germany — 2Niels Bohr Institute, Copenhagen, Denmark — 3University of Leipzig, Germany
Recently, halving of the magnetic flux period was observed experimentally for a Fabry-Perot interferometer in the integer quantum Hall regime with bulk filling factor between 2.5 and 4.5 . In addition, shot noise measurements yielded a Fano factor of two, indicating that the halving of the flux period could be interpreted in terms of electron pairing [1].
While the flux period halving has been explained by a strong Coulomb interaction between the outermost interfering edge mode and an inner non-interfering edge mode [2], an extension of the model [2] is needed to compute shot noise produced by electron partitioning in the interferometer. Specifically, we consider a model in which the number of electrons in the inner edge mode can change stochastically, affecting in this way the tunnelling probability of an interfering electron, and giving rise to an enhanced Fano factor.
In addition, we calculate the interference visibility in the presence of inner edge charge fluctuations, and derive a relation between Fano factor and interference visibility.
H. Choi, I. Sivan, A. Rosenblatt, M. Heiblum, V. Umansky, and D. Mahalu, Nature Comm. 6 (2015)
G. A. Frigeri, D. D. Scherer, B. Rosenow, arXiv:1709.04504 (2017)