# Limits of Validity of Rashba Model in BiTeI: A High-field Magneto-optical Study

## TL;DR

This study investigates the limits of the Rashba model in describing the electronic structure of BiTeI using high-field magneto-optical spectroscopy, revealing deviations at high magnetic fields and suggesting a more linear band structure.

## Contribution

It provides experimental evidence showing the Rashba model's validity only at low magnetic fields and highlights the transition to a linear band behavior at higher fields.

## Key findings

- Rashba model fits low-field data well
- High-field response aligns with massless, conical band picture
- Band structure becomes more linear at higher energies

## Abstract

It was recently shown that BiTeI, a semiconductor with polar crystal structure, possesses a giant spin-splitting of electrons, which has been interpreted in terms of Rashba-type spin-orbit coupling. Here, we use high field magneto-optical spectroscopy to quantify the deviations of the conduction-band profile from this appealing, but at the same time, strongly simplifying model. We find that the optical response -- comprising a series of inter-Landau level excitations -- can be described by the Rashba model only at low magnetic fields. In contrast, the high-field response appears to be more consistent with a simple picture of massless electrons in a conical band. This points towards more linear rather than parabolic at energies well above the bottom of the conduction band.