Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Transport: Nanoelectronics I - Quantum Dots and Wires, Point Contacts 2
TT 11.2: Vortrag
Montag, 23. März 2009, 14:15–14:30, HSZ 301
Electron tunneling into a quantum wire in the Fabry-Pérot regime — •Dario Bercioux1, Stefano Pugnetti2, Fabrizio Dolcini2, and Hermann Grabert1 — 1Physikalisches Institut and Freiburg Institute for Advanced Studies, Universität Freiburg, D-79104 Freiburg, Germany — 2Scuola Normale Superiore and NEST CNR-INFM, I-56126, Pisa Italy
We study a gated quantum wire contacted to source and drain electrodes in the Fabry-Pérot regime. The wire is also coupled to a third terminal (tip) at an arbitrary position along its length. We allow for an asymmetry of the tunneling amplitudes between right/left moving electrons and the tip. Electron-electron interaction in the wire is taken into account by means of the inhomogeneous Luttinger liquid model. The current-voltage characteristics of this three-terminal set-up is shown to exhibit very rich physical effects. We analyze configurations where the tip acts as an electron injector or as a voltage probe. When the tip is in the electron-injection configuration we find that electron-electron coupling does not affect the ratio of the currents flowing to the source and drain electrodes [1]. Contrary to the result by Steinberg et al.[2], this ratio depends only on the asymmetry in tunneling.
[1] S. Pugnetti, F. Dolcini, D. Bercioux, and H. Grabert, arXiv:0810.2962v1 [cond-mat.str-el].
[2] H. Steinberg, G. Barak, A. Yacoby, L. N. Pfeiffer, K. W. West, B. I Halperin, and K. Le Hur, Nature Phys. 4, 116 (2008).