# Superradiant and transport lifetimes of the cyclotron resonance in the topological insulator HgTe

## TL;DR

This paper studies superradiance effects in the surface states of topological insulator HgTe, using classical electrodynamics and spectroscopy to distinguish energy loss mechanisms, revealing superradiance's insensitivity to band structure details.

## Contribution

It demonstrates that superradiance in HgTe's surface states can be explained classically and is unaffected by specific band structure features.

## Key findings

- Superradiance effects are observable in HgTe surface states.
- Energy losses can be separated into intrinsic and radiation losses.
- Superradiance is insensitive to the material's band structure details.

## Abstract

We investigate the superradiance effects in three-dimensional topological insulator HgTe with conducting surface states. We demonstrate that the superradiance can be explained using the classical electrodynamic approach. Experiments using the continuous-wave spectroscopy allowed to separate the energy losses in the system into intrinsic and radiation losses, respectively. These results demonstrate that the superradiance effects are not sensitive to the details of the band structure of the material.