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TT: Fachverband Tiefe Temperaturen
TT 53: Topology: Majorana Physics
TT 53.10: Vortrag
Donnerstag, 19. März 2020, 12:00–12:15, HSZ 103
Majorana-Kondo interplay in T-shaped double quantum dots — •Piotr Majek1, Krzysztof P. Wójcik2,3, and Ireneusz Weymann1 — 1Faculty of Physics, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland — 2Physikalisches Institut, Universität Bonn, Nussallee 12, D-53115 Bonn, Germany — 3Institute of Molecular Physics, Polish Academy of Sciences, 60-179 Poznań, Poland
In this contribution, the electrical transport properties of a T-shaped double quantum dot side-coupled to a topological superconducting nanowire hosting Majorana zero-energy modes are considered theoretically by using the numerical renormalization group method. The corresponding spectral functions and linear response conductance are calculated as a function of model parameters and temperature. In the absence of coupling to Majorana wire, the double dot system exhibits the two-stage Kondo effect, where suppression of conductance at low temperatures is observed. It is shown that the coupling to Majorana wire gives rise to quantum interference, which suppresses the second stage of the Kondo screening in one of the spin channels. As a consequence, we find that the low-temperature conductance becomes equal to e2/2h in the case of long Majorana wires. On the other hand, for shorter wires, the overlap between Majorana quasiparticles develops, suppressing the quantum interference and restoring the two-stage Kondo effect. This work was supported by the National Science Centre in Poland through the Project No. DEC-2018/29/B/ST3/00937.