Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Q43: Novel Topological Superconductors
3:00 PM–6:00 PM,
Wednesday, March 8, 2023
Room: Room 317
Sponsoring
Unit:
DMP
Chair: Sean Thomas, Los Alamos National Laboratory
Abstract: Q43.00003 : Grain boundary band structure engineering in a topological superconductor
3:48 PM–4:00 PM
Presenter:
Morten Amundsen
(NORDITA)
Authors:
Morten Amundsen
(NORDITA)
Vladimir Juricic
(NORDITA)
In our work we study the band structure of the Bogoliubov quasiparticles emerging at the grain boundary formed by a misalignment of two square lattices in a two-dimensional topological superconductor. The misalignment consists of a relative angle, and a relative shift. We find that by tuning only the chemical potential, a large variety of band structures can be generated, ranging from fully gapped, to semimetallic, and finally almost completely flat ones. Furthermore, by applying an in-plane magnetic field, additional tunability is obtained, as the presence or absence of a gap in the band structure may be controlled by the orientation of the magnetic field in a counterintuitive way. Finally, I will discuss the physical mechanism behind these results based on an effective lattice model along the grain boundary.
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