Projects per year
Abstract
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 TI Bi (Formula presented.) Te (Formula presented.) Se(111), below ≈ (Formula presented.) K, by helium-atom scattering and, thus, experimental evidence for a CDW involving Dirac topological electrons. Deviations of the order parameter observed below (Formula presented.) 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 the presence of a prominent electron-phonon interaction, originating from Rashba spin-orbit coupling.
Original language | English |
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Article number | 476 |
Journal | Nanomaterials |
Volume | 13 |
Issue number | 3 |
DOIs | |
Publication status | Published - Feb 2023 |
Keywords
- atom-surface scattering
- charge-density wave
- electron-phonon coupling
- spin-orbit coupling
- topological insulator
ASJC Scopus subject areas
- General Chemical Engineering
- General Materials Science
Fields of Expertise
- Advanced Materials Science
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FWF - Energiedissipation - Energy Dissipation on Dirac and 2D Material Surfaces
1/09/21 → 31/08/25
Project: Research project
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FWF - Material Dynamic - Surface dynamics of topological materials
1/01/17 → 30/06/21
Project: Research project
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