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 Bi2Te2Se. THE JOURNAL OF PHYSICAL CHEMISTRY LETTERS.

Observation of Dirac Charge-Density Waves in Bi2Te2Se

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
2021
open
Ruckhofer, A., Benedek, G., Ernst, W., Tamtögl, A. (2021). Observation of Dirac Charge-Density Waves in Bi2Te2Se. THE JOURNAL OF PHYSICAL CHEMISTRY LETTERS.
File in questo prodotto:
File Dimensione Formato  
461. arXiv BiTeSe (2021).pdf

accesso aperto

Descrizione: Articolo principale
Tipologia di allegato: Submitted Version (Pre-print)
Dimensione 4.51 MB
Formato Adobe PDF
4.51 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/370665
Citazioni
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
Social impact