Weak-value amplification forWeyl-point separation in momentum space

TL;DR

This paper demonstrates that weak-value amplification can be used to precisely measure the separation of Weyl nodes in momentum space by exploiting spin-orbit interactions in ultra-thin Weyl semimetals.

Contribution

It introduces a novel application of weak measurements to determine Weyl node separation in WSMs via spin-dependent splitting.

Findings

Spin-dependent splitting relates to Weyl node separation.

Weak measurement amplifies the spin-orbit interaction effect.

Method enables precise characterization of Weyl semimetals.

Abstract

The existence of Weyl nodes in the momentum space is a hallmark of a Weyl semimetal (WSM). A WSM can be confirmed by observing its Fermi arcs with separated Weyl nodes. In this paper, we study the spin- orbit interaction of light on the surface of WSM in the limit that the thickness is ultra-thin and the incident surface does not support Fermi arc. Our results show that the spin-dependent splitting induced by the spin-orbit interaction is related to the separation of Weyl nodes. By proposing an amplification technique called weak measurements, the distance of the nodes can be precisely determined. This system may have application in characterizing other parameters of WSM.