ELFT HÍRADÓ

[Andras Palyi <palyi AT mail.bme.hu>]

Dear Colleagues, 

Next Monday the BME Exotic Quantum Phases seminar continues with this talk:

Speaker: Tamas Galambos (Basel)
Title: "Superconducting Quantum Interference in Edge State Josephson 
Junctions"
Abstract: see below
Reference: T. Galambos et al., Phys. Rev. Lett. 125, 157701 (2020)
Time: Nov 9, Monday, 14:15
Location: online in Teams

About the speaker: Tamas is a senior PhD student in condensed-matter theory 
at the University of Basel, in the research group of Jelena Klinovaja and 
Daniel Loss. Beforehand, he completed his BSc and MSc at BME, where he did 
theory research on strongly correlated quantum systems, supervised by Csaba 
Toke.  

Link to join the meeting in Teams: 
https://teams.microsoft.com/l/meetup-join/19%3a966508fa2dc64c00b29f3a166fb2361b%40thread.tacv2/1604601848420?context=%7b%22Tid%22%3a%226a3548ab-7570-4271-91a8-58da00697029%22%2c%22Oid%22%3a%22f8b27e90-dbca-4bb5-813c-d6415577ec35%22%7d

Best regards,
Andras Palyi

= = = 
Abstract: "We study superconducting quantum interference in a Josephson 
junction linked via edge states in two-dimensional (2D) insulators. We 
consider two scenarios in which the 2D insulator is either a topological or a 
trivial insulator supporting one-dimensional (1D) helical or nonhelical edge 
states, respectively. In equilibrium, we find that the qualitative dependence 
of critical supercurrent on the flux through the junction is insensitive to 
the helical nature of the mediating states and can, therefore, not be used to 
verify the topological features of the underlying insulator. However, upon 
applying a finite voltage bias smaller than the superconducting gap to a 
relatively long junction, the finite-frequency interference pattern in the 
nonequilibrium transport current is qualitatively different for helical edge 
states as compared to nonhelical ones. "