Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 31: Topology: Majorana Physics
TT 31.12: Talk
Wednesday, March 29, 2023, 12:30–12:45, HSZ 304
Time-reversal invariant topological superconductor in the Coulomb blockade regime — •Steffen Bollmann1, Elio König1, and Jukka Väyrynen2 — 1Max Planck Institute for Solid State Research, Stuttgart — 2Purdue University, West Lafayette, Indiana USA
Floating topological superconductors coupled to conduction electrons can realize unconventional O(N), Sp(2N), or multi-channel Kondo effects. Here, we introduce a new topological superconducting mesoscopic device, a time-reversal invariant version of the Majorana Cooper pair box in the Coulomb blockade regime. In this setup of Cartan-Altland-Zirnbauer class DIII, spinful Majorana zero modes appear at the edges of a topological triplet superconductor with fluctuating Cooper pair spin and charge. We study the Kondo effect in the limit of dominating charging energy and in the limit of both small and large spin fluctuations. Beyond its value in the context of exotic mesoscopic Kondo effects, our study sheds light on the intricate interplay of band topology and strong quantum fluctuations of non-Abelian order parameter fields.