# Topological resonance in Weyl semimetals in circularly-polarized optical pulse

## TL;DR

This paper theoretically investigates how circularly-polarized laser pulses induce topological resonance in Weyl semimetals, affecting electron dynamics and resulting in chiral conduction band populations near Weyl points.

## Contribution

It introduces the concept of topological resonance in Weyl semimetals and analyzes its dependence on pulse handedness and phase competition, revealing intrinsic chirality effects.

## Key findings

- Topological resonance governs ultrafast electron dynamics in Weyl semimetals.
- Circularly-polarized pulses produce chiral conduction band populations.
- The resonance depends on the competition between topological and dynamic phases.

## Abstract

We study theoretically the ultrafast electron dynamics of three-dimensional Weyl semimetals in the field of a laser pulse. For a circularly-polarized pulse, such dynamics is governed by topological resonance, which manifests itself as a specific conduction band population distribution in the vicinity of the Weyl points. The topological resonance is determined by the competition between the topological phase and the dynamic phase and depends on the handedness of a circularly polarized pulse. Also, we show that the conduction band population induced by a circularly-polarized pulse that consists of two oscillations with opposite handedness is highly chiral, which represents the intrinsic chirality of the Weyl points.