Partenaires

CNRS
U.G.A



Rechercher

Sur ce site

Sur le Web du CNRS


Logo LaNef

PHITEM


SFP 38
EcoInfo
Parité Science

Accueil > Rubrique hors menu > Événements > Actualités > Séminaire

Séminaire théorie

Maxim Kharitonov (University of Würzburg)
Universality and stability of the edge states of chiral-symmetric topological semimetals and surface states of the Luttinger semimetalUniversality and stability of the edge states of chiral-symmetric
Lieu : Amphithéâtre, maison des Magistères,
le vendredi 13 décembre 2019 à 11h00
Personne à contacter : Serge Florens ()

We theoretically demonstrate that the chiral structure of the nodes of nodal semimetals is responsible for the existence and universal local properties of the edge states in the vicinity of the nodes. We perform a general analysis of the edge states for an isolated node of a 2D semimetal, protected by chiral symmetry and characterized by the topological winding number N. We derive the asymptotic chiral-symmetric boundary conditions and find that there are N+1 universal discrete classes of them. The class determines the numbers of flat-band edge states on either side off the node in the 1D spectrum and the winding number N gives the total number of edge states. We then show that the edge states of chiral nodal semimetals are robust: they persist in a finite-size stability region of parameters of chiral-asymmetric terms. This significantly extends the notion of 2D and 3D topological nodal semimetals. We demonstrate that the Luttinger model with a quadratic-node for j=3/2 electrons (Luttinger semimetal) is a 3D topological semimetal in this new sense and predict that alpha-Sn, HgTe, possibly Pr2Ir2O7, and many other semimetals described by it are topological and exhibit surface state. Reference: M. Kharitonov, J.-B. Mayer, and E. M. Hankiewicz, Phys. Rev. Lett. 119, 266402 (2017).


Si vous ne recevez pas les annonces de ces séminaires, abonnez-vous à la liste de diffusion en envoyant cet e-mail.

Dans la même rubrique :