Title:	Coulomb Interactions in Weyl Semimetals
DNr:	SNIC 2018/3-401
Project Type:	SNIC Medium Compute
Principal Investigator:	Emil Johansson Bergholtz <emil.bergholtz@fysik.su.se>
Affiliation:	Stockholms universitet
Duration:	2018-08-31 – 2019-09-01
Classification:	10304
Homepage:	http://www.su.se/profiles/ejb-1.282013
Keywords:

Abstract

We use a novel simulation technique, known as Diagrammatic Monte Carlo (Diag MC) to study the effects of coulomb interactions in the Weyl Semi Metals (WSM’s). These materials are currently attracting enormous interest as a testbed for phenomena originally conjectured in the context of high energy physics, like Weyl and Majorana fermions. However, they also display new and poorly understood emergent phenomena such as novel superconductivity and as of today the strongest magnetoresistance known in any material [1]. Previous work on this topic was conducted mainly in the context of noninteracting theory, with a small number of exceptions where interactions were taken into account via for example diagrammatic expansions to first order or other forms of approximations. Our program uses state of the art simulation techniques to obtain exact and unbiased results for the effects of coulomb interactions in WSM’s, in particular focusing on interplay between interactions and anisotropy. This research is an integral part of the Swedish Research Council project "Tilted Weyl Fermions" that is lead by Emil Bergholtz.