Tuning quantum states at a chirality-reversed planar interface in Weyl semimetals using an interstitial layer

Document Type

Article

Publication Date

12-9-2025

Abstract

The electronic band structure ofWeyl semimetals possesses pairs of linear band crossings, calledWeyl nodes, characterized by opposite chirality charges associated with each node. The momentum space position of the nodes can reverse across a planar interface and these host Fermi-arc-like bound states, in addition to scattering states. We show that a magnetic interstitial layer can tune these states in three distinct ways. The electrostatic potential and one of the in-plane magnetic potential components control the shape of the bound state Fermi arcs. For moderate values of the same in-plane magnetic potential electrons are spin-filtered across the interface, while both the in-plane magnetic components and the electrostatic potential control the transmission of electrons. The ratio of in-plane to out-of-plane magnetic components can be used to turn on or turn off the magnetic potential effects, since the latter does not affect the interface states. The tunability arises from spin-momentum locking and chirality reversal at the interface. Thus, the effects can mix or interchange depending on the specific material but the states will remain tunable.

Publication Source (Journal or Book title)

Physical Review B

First Page

2351251

Last Page

2351259

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