Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series SEM-LPTMC
Subjects cond-mat.mes-hall
Date Monday 14 October 2019
Time 10:45
Institute LPTMC
Seminar Room campus Jussieu, tower 13-12, 5th floor, room 523
Speaker's Last Name Marciani
Speaker's First Name Marco
Speaker's Email Address
Speaker's Institution Laboratoire de Physique, ENS Lyon
Title Optical topological chiral modes flowing between non-topological materials
Abstract The most remarkable feature of the so-called "topological crystals" is the presence of states flowing at their edge that are robust against disorder. A beautiful mathematical theory allows to predict the properties of such states directly from the topological invariants (e.g. the Chern numbers) of the bulk bands. Given the great success of this theory in terms of theoretical impact and technological advance, in recent years much effort has been put to make the extension from the field electronics to other fields[1] and from crystals to various non-crystaline systems such as quasi-crystals and amorphous materials. In this talk I will show how deal with continuous systems governed by linear Maxwell's equations[2]. Even though bands Chern numbers cannot be defined and optical materials are non-topological, we discover that interface Chern numbers can always be defined by means of the theory of spectral flows[3]. These invariants correctly describe chiral modes as we verified numerically on interfaces between different gyrotropic materials. [1] S. Raghu and F. D. M. Haldane, Phys. Rev. A78, 033834 (2008). [2] M. G. Silveirinha, Phys. Rev. B92, 125153 (2015). [3] M. Marciani and P. Delplace, arXiv:1906.09057 (2019).
arXiv Preprint Number

To Generate a poster for this seminar : [ Postscript | PDF ]

[ Annonces ]    [ Abonnements ]    [ Archive ]    [ Aide ]    [ ]
[ English version ]