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TT: Fachverband Tiefe Temperaturen

TT 40: Topological Josephson Junctions

TT 40.6: Vortrag

Mittwoch, 18. März 2020, 16:15–16:30, HSZ 103

Improving topological superconductivity in two-dimensional Josephson junctions — •Aidan Wastiaux and Falko Pientka — Max-Planck Institut für Physik komplexer Systeme, Noethnitzer Straße 38 01187 Dresden

Two-dimensional Josephson junctions in a magnetic field are a new platform to host localized Majorana bound states (MBS) [1]. While recent experiments [2,3] have confirmed the possibility of engineering such a topological phase, improvements are needed to stabilize it. It is therefore important to predict suitable values of the microscopic parameters in order to realize a robust topological phase in Josephson junctions (see [4,5]).

In this talk, we extend previous work to the case of large Zeeman energies and identify optimal regimes (i.e., with a large spectral gap protecting the MBS), based on a combination of analytical and numerical results. Moreover, we compare the planar Josephson junction to a nanowire proximitized by two superconductors with a phase difference.

[1] Pientka et al., PRX 7, 021032 (2017)

[2] Fornieri et al., Nature 569, 89-92 (2019)

[3] Ren et al., Nature 569, 93-98 (2019)

[4] Setiawan et al., PRB 99, 220506 (2019); Setiawan et al., PRB 99, 174511 (2019)

[5] Scharf et al., PRB 99, 214503 (2019)