ELFT HÍRADÓ

[Szeminárium koordinátor <szfi-seminar AT wigner.hun-ren.hu>]

Nagy Attila is inviting you to a scheduled Zoom meeting.Topic: SZFI 
SeminarTime: Oct 21, 2025 10:00 
Budapesthttps://wigner-hu.zoom.us/j/83185660747?pwd=tlDkQm6seOIvifX6SuvZWzDjTCXCMJ.1Meeting
 ID: 831 8566 0747Passcode: 646199SZFI Seminar
Thore Posske
(University of Hamburg, host: Rózsa Levente)
Hybridizing Machida-Shibata states - a route to topological superconductivity 
in symmetry class DIII?
Recently, the Machida-Shibata states, which are surface states with an 
unusual weak coupling to a superconducting bulk, have been realized in 
Ag-corrals on Ag islands on superconducting Nb [1]. These time reversal 
invariant in-gap states, which represent the elemental form of a proximity 
gapped electronic state, form a new building block for in-gap topological 
electronic matter in symmetry class DIII. Intriguingly, symmetry class DIII 
has rigorously been shown not to exhibit topologically nontrivial phases in 
the proximity-coupling setup. By considering a small intra-corral electron 
interaction, we circumvent the no go theorem and theoretically demonstrate 
the hybridization of Machida-Shibata states to topologically nontrivial 
chains with pairs of Majorana modes at their ends, which are protected from 
mutual scattering by time-reversal symmetry [2].Special emphasis is given on 
symmetry classification and the spectral peculiarities of this phase, which 
host vast regions of momenta with flat dispersion.[1] 
https://www.nature.com/articles/s41586-023-06312-0 [2] 
https://arxiv.org/abs/2504.08674Tuesday, 21 October 2025, 10:00
Wigner FK SZFI, Bldg. 1, 2nd floor auditorium
Language of the talk: English
All interested are welcome!
Attila Nagyszfi-seminar AT wigner.hun-ren.hu