Connecting the dots: Time-reversal symmetric Weyl Semimetals with tunable Fermi arcs

TL;DR

This paper introduces a family of time-reversal symmetric Weyl semimetal models with tunable Fermi arc connectivity, allowing continuous control over surface states without altering bulk Weyl node properties.

Contribution

It presents a novel lattice model for Weyl semimetals with tunable Fermi arcs and explores their bulk polarization and magnetization dependence on a tuning parameter.

Findings

Fermi arc connectivity can be tuned continuously.

Bulk Weyl nodes remain fixed in position and chirality.

Bulk polarization and magnetization vary with the tuning parameter.

Abstract

We propose a one-parameter family of noninteracting lattice models for Weyl semimetals with 4 Weyl nodes and tunable Fermi arcs. These 2-band model Hamiltonians are time-reversal symmetric with $\mathrm{T}^2 = + 1$, and tuning the parameter changes the connectivity of the Fermi arcs continuously without affecting the location and chiralities of the Weyl nodes in the bulk Brillouin zone. The bulk polarization and magnetization are shown to vary with this parameter, a dependence inaccessible to the low energy effective field theory.