Tunable Weyl Semi-metal and its Possible Realization in Optical Lattice

TL;DR

This paper introduces a tunable model for Weyl semimetals with different tilt types, explores their unique properties, and proposes an experimental setup for realization in optical lattices.

Contribution

It presents a new lattice model for tunable Weyl semimetals, identifying three tilt types and analyzing their topological features and experimental realization.

Findings

Identified three types of Weyl semimetals with different tilt strengths.

Analyzed chiral modes, Fermi arcs, and quantum Hall effects in these WSMs.

Proposed an experimental setup for realizing these WSMs in optical lattices.

Abstract

Weyl semimetal (WSM) is an exotic topological state in condensed matter physics. In this paper, based on a two-band cubic lattice model, we studied WSMs with a pair of tunable Weyl nodes. It is pointed out that there exist three types of WSMs with different tilt strengths: type-I WSM, type-II WSM and type-1.5 WSM. In particular, type-1.5 WSM has one type-I node and one type-II node. We studied chiral modes, surface Fermi arcs and quantum anomalous Hall effect in different types of WSMs. In addition, we give an experimental setup to realize the different types of WSMs based on timely technique.