Regensburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 58: Transport: Poster Session

TT 58.4: Poster

Mittwoch, 9. März 2016, 15:00–18:30, Poster D

Zero-bias anomalies in electron transport through quantum dots for temperatures above the Kondo temperature — •Sebastian Wenderoth, Jakob Bätge, and Rainer Härtle — Institut für theoretische Physik, Georg-August-Universität Göttingen

We study the influence of exchange interactions on the steady-state transport properties of simple quantum dot structures that can be described by the single-impurity Anderson model and its spinless counterpart. To this end, we employ the quantum master equation methodolody, including a numerically exact, hierarchical technique [1,2] and, as an additional analytical tool, the Born-Markov approximation. We show that exchange interactions can lead to a zero-bias anomaly in the conductance, even for temperatures that are much higher than the respective Kondo temperature. The comparison of exact and approximate results allows us to reveal the underlying physical mechanisms, in particular the role of first- and second-order processes, decoherence and renormalization effects.
R. Härtle et al., PRB 88, 235426 (2013)
R. Härtle et al., PRB 92, 085430 (2015)