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 D43: Topological Superconductivity in Engineered Heterostructures
3:00 PM–6:00 PM,
Monday, March 6, 2023
Room: Room 317
Sponsoring
Unit:
DMP
Chair: Cui-Zu Chang, The Pennsylvania State University; Igor Zutic, State Univ of NY - Buffalo
Abstract: D43.00005 : Influence of disorder on vortex Majorana states in 3D topological insulators*
4:12 PM–4:24 PM
Presenter:
Jukka Vayrynen
(Purdue University)
Authors:
Jukka Vayrynen
(Purdue University)
Rafal Rechcinski
(Microsoft)
Dmitry I Pikulin
(Microsoft Corp)
Roman M Lutchyn
(Microsoft Corp)
heterostructures present a promising alternative to nanowire-based approaches.
Vortices can be pinned to anti-dots pre-fabricated in the superconductor; large anti-
dots are relatively simple to fabricate and ensure that weak magnetic fields are
sufficient to induce a required quantum of flux. However, it has thus far been unclear
whether current topological insulator materials are clean enough to sustain Majorana
vortex modes with a sizable gap to excitations. In this talk, I will present our numerical
studies of the vortex subgap spectrum as a function of disorder, chemical potential,
and the anti-dot size. We employ a two-dimensional low-energy description of the
topological insulator surface, which allows us to simulate large system sizes with
vortices up to 1 micron in diameter. We connect our results to existing mobility
measurement data to translate the level of disorder in existing materials to our
simulated disorder model.
*This material is based upon work supported by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Quantum Science Center
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