Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Transport: Quantum Dots, Quantum Wires, Point Contacts

TT 16.4: Vortrag

Montag, 7. März 2016, 15:45–16:00, H21

Odd triplet superconductivity in ultrasmall quantum dots — •Stephan Weiss¹, Björn Sothmann², and Jürgen König¹ — ¹Theoretische Physik, Universität Duisburg-Essen & CENIDE — ²Institut für Theoretische Physik und Astrophysik, Universität Würzburg

We report on the possibility to create odd frequency Cooper pairs in proximized interacting quantum dots attached to ferromagnetic leads. Spin blockade effects together with induced superconductivity allow electron pairs with same spin at different times to carry superconducting correlations. Besides the conventional finite singlet pairing amplitude on the dot, only odd frequency triplet pairing is possible here. This is in contrast to the double dot case [1]. We demonstrate how the order parameter for odd-frequency triplet pairing as well as the differential Andreev conductance are influenced when tuning gate and/or bias voltages, the angle of magnetizations of the leads and the coupling to the nearby superconductor.
B. Sothmann, S. Weiss, M. Governale and J. König,

PRB 90, 220501 (2014).