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TT: Fachverband Tiefe Temperaturen

TT 28: Topology: Other Topics

TT 28.2: Vortrag

Dienstag, 19. März 2024, 09:45–10:00, H 3025

A minimal quantum dot-based Kitaev chain with only local superconducting proximity effect — •William Samuelson, Viktor Svensson, and Martin Leijnse — Division of Solid State Physics and NanoLund, Lund University, Lund, Sweden

The possibility to engineer a Kitaev chain in quantum dots coupled via superconductors has recently emerged as a promising path toward topological superconductivity and possibly nonabelian physics. In this talk, I will discuss how some of the main experimental hurdles on this path can be avoided by using only local proximity effect on each quantum dot in a geometry resembling a two-dot version of the proposal in New J. Phys. 15 045020 (2013), see arXiv:2310.03536. There is no need for narrow superconducting couplers, additional Andreev bound states, or spatially varying magnetic fields; it suffices with spin-orbit interaction and a constant magnetic field, in combination with control of the superconducting phase to tune the relative strengths of elastic cotunneling and an effective crossed-Andreev-reflection-like process generated by higher-order tunneling. We use a realistic spinful, interacting model and show that high-quality Majorana bound states can be generated already in a double quantum dot.

Keywords: minimal Kitaev chain; quantum dots; poor man's Majoranas; Majorana bound states