Revealing a charge-density-wave gap in the predicted weak topological insulator HoSbTe

Abstract

HoSbTe was predicted to be a weak topological insulator, whose spin-orbit coupling (SOC) gaps are reported to be as large as hundreds of meV. Utilizing infrared spectroscopy, we find that the compound is of metallic nature from 350 K down to 10 K. Particularly, both of its itinerant carrier density and scattering rate are demonstrated to decrease with temperature cooling, which is responsible for the appearance of a broad hump feature in the temperature dependent resistivity around 200 K. More importantly, we reveal the appearance of a charge density wave (CDW) gap in addition to the SOC related gap. The energy scale of the CDW gap is identified to be 364 meV at 10 K, which shift to 252 meV at 350 K. The coexistence of CDW and SOC gaps in the same compound paves a new avenue to explore more intriguing physics.

References in corpus (7)

• Non-Abelian Anyons and Topological Quantum Computation
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Chiral anomaly, Charge Density Waves, and Axion Strings from Weyl Semimetals
• Coexistence and competition of multiple charge-density-wave orders in rare-earth tri-telluride RTe3
• Magnetic and electronic properties of a topological nodal line semimetal candidate: HoSbTe
• Electronic Transport Evidence for Topological Nodal-Line Semimetals of ZrGeSe single crystals
• Evidence for bulk nodal loops and universality of Dirac-node arc surface states in ZrGeXc (Xc = S, Se, Te)

Cited by in corpus (5)

• Competing magnetic phases in LnSbTe (Ln = Ho and Tb)
• On the magnetic structures of 1:1:1 stoichiometric topological phases LnSbTe (Ln = Pr, Nd, Dy and Er)
• Evidence for electronic signature of magnetic transition in topological magnet HoSbTe
• Observation of Dirac Charge Density Waves in Bi${}_2$Te${}_2$Se
• Multiple charge-density-wave gaps in LaSbTe and CeSbTe as revealed by ultrafast spectroscopy