- Letter
Dynamics of surface electrons in a topological insulator: Cyclotron resonance at room temperature
Phys. Rev. B 113, L041201 – Published 23 January, 2026
DOI: https://doi.org/10.1103/v51q-61b4
Abstract
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 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.
