AI Article Synopsis
- The study presents the first experimental observation of a charge-density wave (CDW) at the surface of the topological insulator Bi2Te2Se(111) below approximately 350K, challenging previous assumptions.
- The findings indicate a deviation in the order parameter below 180K, suggesting the emergence of a spin-density wave that shares the CDW's periodicity, influenced by strong electron-phonon coupling.
- These results highlight the complex interactions among topological electrons, spin-density waves, and phonons in this material, enhancing our understanding of topological insulators.
Article 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 Bi2Te2Se(111), below ≈350K, by helium-atom scattering and, thus, experimental evidence for a CDW involving Dirac topological electrons. Deviations of the order parameter observed below 180K, 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.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9919891 | PMC |
| http://dx.doi.org/10.3390/nano13030476 | DOI Listing |
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