Beta-Borophene Under Circularly Polarized Radiation: Polaritonic and Polaronic Dynamic Band Structure

TL;DR

This paper investigates how circularly polarized light influences the electronic band structure and polarons in monolayer beta-borophene, revealing controllable band gap modifications through radiation and substrate effects.

Contribution

It introduces a theoretical framework for analyzing the effects of off-resonant circularly polarized radiation on polarons and band structure in beta-borophene, incorporating phonon interactions.

Findings

Electronic band gap can be widely tuned by light irradiation.

Substrate properties significantly affect band gap control.

The study provides a perturbative approach for off-resonant light effects.

Abstract

We study the effect of circularly polarized electromagnetic radiation on optical polarons in monolayer \b{eta}-borophene. We focus on the off-resonant regime of large driving frequencies, which allows to set up an effectively time-independent Hamiltonian describing the radiation field in up to second perturbational order. The contributions of optical surface phonons are incorporated according to Lee-Low-Pines theory, via a sequence of appropriate unitary transformations. A central object in our investigation is the electronic band gap, which is shown to be widely controllable via the variation of light irradiation and substrate properties.