# Tunable Circular Dichroism and Valley Polarization in the Modified Haldane Model

## TL;DR

This paper explores how the modified Haldane model enables tunable circular dichroism and valley polarization, revealing a rich optical phase diagram with potential for advanced photonic and valleytronic devices.

## Contribution

It demonstrates the simultaneous achievement and independent tuning of perfect circular dichroism and valley polarization in the modified Haldane model.

## Key findings

- Perfect circular dichroism and valley polarization can be achieved simultaneously.
- Optical properties can be tuned independently by varying the Fermi energy.
- The model suggests potential applications in photonic devices and valleytronics.

## Abstract

We study the polarization dependence of optical absorption for the modified Haldane model, which exhibits antichiral edge modes in presence of sample boundaries and has been argued to be realizable in transition metal dichalcogenides or Weyl semimetals. A rich optical phase diagram is unveiled, in which the correlations between perfect circular dichroism, pseudospin and valley polarization can be tuned independently upon varying the Fermi energy. Importantly, perfect circular dichroism and valley polarization are achieved simultaneously. This unprecedented combination of optical properties suggests some interesting novel photonic device functionality (e.g. light polarizer) which could be combined with valleytronics applications (e.g. generation of valley currents).