Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series SEM-LPTMC
Subjects cond-mat.mes-hall
Date Monday 16 November 2020
Time 10:45
Institute LPTMC
Seminar Room On-line zoom seminar
Speaker's Last Name Kaladzhyan
Speaker's First Name Vardan
Speaker's Email Address vardan [dot] kaladzhyan [at] phystech [dot] edu
Speaker's Institution University of Basel
Title Boundary Modes from Impurity-induced States
Abstract We provide a new and exact formalism to describe the formation of end, edge or surface states through the evolution of impurity-induced states. We propose a general algorithm that consists of finding the impurity states via the T-matrix formalism and showing that they morph into boundary modes when the impurity potential goes to infinity. We apply this technique to obtain both topological and trivial boundary modes in various models. Furthermore, we demonstrate that the technique provides a non-recursive analytical way of computing boundary Green's functions. To provide an example, we use the latter to calculate exactly quasiparticle interference patterns on the surface of Weyl semimetals, and we compare our findings with the previously obtained results based on the joint density of states approach, demonstrating the experimental relevance and importance of our method.
arXiv Preprint Number
Comments ID de réunion : 935 2046 3813 Code secret : 096019

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