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

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 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.

References in corpus (39)

• Topological Insulators
• Topological insulators and superconductors
• Topological Insulator Materials
• Topological quantum chemistry
• Colloquium: Topological Band Theory
• Fermi surface nesting and the origin of Charge Density Waves in metals
• Large bulk resistivity and surface quantum oscillations in the topological insulator Bi2Te2Se
• Classification of Charge Density Waves Based on Their Nature
• Three-dimensional quantum Hall effect and metal-insulator transition in ZrTe5
• Topological Surface States and Dirac point tuning in ternary Bi2Te2Se class of topological insulators
• Probing topological insulators surface states via plasma-wave Terahertz detection
• Measurement of an Exceptionally Weak Electron-Phonon Coupling on the Surface of the Topological Insulator Bi${}_2$Se${}_3$ Using Angle-Resolved Photoemission Spectroscopy
• The role of the spin in quasiparticle interference
• Dispersive charge density wave excitations and temperature dependent commensuration in Bi2Sr2CaCu2O8+δ
• Distinguishing bulk and surface electron-phonon coupling in the topological insulator Bi2Se3 using time-resolved photoemission spectroscopy
• A Charge-Density-Wave Topological Semimetal
• Stability of the Bi2Se3(111) topological state: electron-phonon and -defect scattering
• Fermi surface nesting in several transition metal dichalcogenides
• Temperature dependent photoemission on 1T-TiSe2: Interpretation within the exciton condensate phase model
• Transition between strong and weak topological insulator in ZrTe${}_5$ and HfTe${}_5$
• Growth of High-Mobility Bi2Te2Se Nanoplatelets on hBN Sheets by van der Waals Epitaxy
• Topological Surface States with Persistent High Spin Polarization across Dirac Point in Bi${}_2$Te${}_2$Se and Bi${}_2$Se${}_2$Te
• Direct Measurement of Surface Transport on a Bulk Topological Insulator
• Evidence of surface transport and weak anti-localization in single crystal of Bi2Te2Se topological insulator
• Charge puddles in the bulk and on the surface of the topological insulator BiSbTeSe${}_2$ studied by scanning tunneling microscopy and optical spectroscopy
• Electron-Phonon Coupling and Surface Debye Temperature of Bi${}_2$Te${}_3$(111) from Helium Atom Scattering
• Origin of the Electron-Phonon Interaction of Topological Semimetal Surfaces Measured with Helium Atom Scattering
• Nanoscale Surface Dynamics of Bi${}_2$Te${}_3$(111): Observation of a Prominent Surface Acoustic Wave and the Role of van der Waals Interactions
• Charge density waves in graphite; towards the magnetic ultra-quantum limit
• Dirac states with knobs on: interplay of external parameters and the surface electronic properties of 3D topological insulators
• THz Surface Modes and Electron-Phonon Coupling in Bi${}_2$Se${}_3$(111)
• Unoccupied topological surface state in Bi${}_2$Te${}_2$Se
• Strong-coupling charge density wave in a one-dimensional topological metal
• Strongly anisotropic spin-orbit splitting in a two-dimensional electron gas
• Tunable two-dimensional electron gas at the surface of thermoelectric material In${}_4$Se${}_3$
• Charge density waves and Fermi level pinning in monolayer and bilayer SnSe${}_2$
• Revealing a charge-density-wave gap in the predicted weak topological insulator HoSbTe
• Spin density wave order in interacting type-I and type-II Weyl semimetals
• Chirality relaxation in low-temperature strongly Rashba-coupled systems