Hybrid Weyl Semimetal

TL;DR

This paper introduces a new class of Weyl semimetals called hybrid Weyl semimetals, featuring one type-I and one type-II Weyl node, and explores their topological properties, electronic structure, and potential material realizations.

Contribution

It constructs a tight-binding model for hybrid Weyl semimetals, the first to demonstrate coexistence of type-I and type-II Weyl nodes within a single system.

Findings

Identification of a hybrid Weyl semimetal phase with mixed Weyl node types.

Analysis of bulk Fermi surfaces and topologically protected surface states.

Discussion of Landau level structure and quantum oscillations.

Abstract

We construct a tight-binding model realizing one pair of Weyl nodes and three distinct Weyl semimetals. In the type-I (type-II) Weyl semimetal, both nodes belong to type-I (type-II) Weyl nodes. In addition, there exists a novel type, dubbed "hybrid Weyl semimetal", in which one Weyl node is of type-I while the other is of type-II. For the hybrid Weyl semimetal, we further demonstrate the bulk Fermi surfaces and the topologically protected surface states, analyze the unique Landau level structure and quantum oscillation, and discuss the material realization.