While the hexagonal 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 TI Bi2Te2Se(111), below ≈350K by helium atom scattering, and thus experimental evidence of a CDW involving Dirac topological electrons. Deviations of the order parameter observed below 200K 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.

Ruckhofer, A., Benedek, G., Ernst, W., Tamtögl, A. (2021). Observation of Dirac Charge Density Waves in Bi$_2$Te$_2$Se. THE JOURNAL OF PHYSICAL CHEMISTRY LETTERS.

Observation of Dirac Charge Density Waves in Bi$_2$Te$_2$Se

Giorgio Benedek;
2021

Abstract

While the hexagonal 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 TI Bi2Te2Se(111), below ≈350K by helium atom scattering, and thus experimental evidence of a CDW involving Dirac topological electrons. Deviations of the order parameter observed below 200K 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.
Articolo in rivista - Articolo scientifico
Physics - Mesoscopic Systems and Quantum Hall Effect; Physics - Mesoscopic Systems and Quantum Hall Effect; Physics - Materials Science
English
Ruckhofer, A., Benedek, G., Ernst, W., Tamtögl, A. (2021). Observation of Dirac Charge Density Waves in Bi$_2$Te$_2$Se. THE JOURNAL OF PHYSICAL CHEMISTRY LETTERS.
Ruckhofer, A; Benedek, G; Ernst, W; Tamtögl, A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/370665
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