The ability to manipulate the surface states of topological insulators using electric or magnetic fields under ambient conditions is a key step toward their integration into future electronic and optoelectronic devices. Here, we demonstrate - using cyclotron resonance measurements on a tin-doped BiSbTe2S topological insulator - that moderate magnetic fields can quantize massless surface electrons into Landau levels even at room temperature. This finding suggests that surface-state electrons can behave as long-lived quasiparticles at unexpectedly high temperatures.
@article{arxiv.2504.08420,
title = {Dynamics of surface electrons in a topological insulator: cyclotron resonance at room temperature},
author = {I. Mohelsky and F. Le Mardele and J. Dzian and J. Wyzula and X. D. Sun and C. W. Cho and B. A. Piot and M. Shankar and R. Sankar and A. Ferguson and D. Santos-Cottin and P. Marsik and C. Bernhard and A. Akrap and M. Potemski and M. Orlita},
journal= {arXiv preprint arXiv:2504.08420},
year = {2026}
}
Comments
6 pages, 3 figures, to be published as a Letter in Phys. Rev. B