Dresden 2011 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 60: Quantum Dots: Transport

HL 60.5: Vortrag

Mittwoch, 16. März 2011, 16:00–16:15, POT 251

Transmission phases and conductance through quantum dots in Fano regime of transport — •Elena Roxana Racec — Technische Universität Cottbus, Fakultät 1, Postfach 101344, 03013 Cottbus, Germany — University of Bucharest, Faculty of Physics, PO Box MG-11, 077125 Bucharest Magurele, Romania

We analyze a quantum dot strongly coupled to the conducting leads via quantum point contacts - Fano regime of transport - and report a variety of resonant states that demonstrate the dominance of the interacting resonances in the scattering process in a low confining potential [1]. As effects of the interaction between resonances, the line shapes of the conductance peaks are described by Fano functions with complex asymmetry parameters and the phases of the transmission amplitudes do not increase monotonically by π through each conductance peak anymore. The phase lapses, typical for the universal behaviour, are obtained as a particular case for weak interacting resonances, while the strong interaction regime is associated with the mesoscopic phase evolution.

[1] E. R. Racec, U. Wulf, P. N. Racec, Phys. Rev. B 82, 085313 (2010) [16 pages]