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Observation of Dirac Charge Density Waves in Bi$ 2$Te$ 2$Se by Ruckhofer, Adrian; Benedek, Giorgio; Bremholm, Martin; Ernst, Wolfgang E.; Tamtögl, Anton is a scholarly article available to read on EtoBox.

What is Observation of Dirac Charge Density Waves in Bi$ 2$Te$ 2$Se about?

While parallel segments in the Fermi level contours, often found at the surfaces of topological insulators (TIs) would imply "strong" nesting conditions, the existence of charge density waves (CDWs) - periodic modulations of the electron density - has not been verified up to now. Here, we report the observation of a CDW at the surface of the Bi$_2$Te$_2$Se(111), below $\approx 350\,$K by helium atom scattering, and thus experimental evidence of a CDW involving Dirac topological electrons. Deviations of the order parameter observed below $180\,$K and a low temperature break of time reversal symmetry suggest the onset of a spin density wave with the same period as the CDW in presence of a prominent electron-phonon interaction originating from the Rashba spin-orbit coupling.

Author

Ruckhofer, Adrian; Benedek, Giorgio; Bremholm, Martin; Ernst, Wolfgang E.; Tamtögl, Anton

Published

2021

Language

EN