Kramers nodal line in the charge density wave state of YTe${}_3$ and the influence of twin domains

Abstract

Recent studies have focused on the relationship between charge density wave (CDW) collective electronic ground states and nontrivial topological states. Using angle-resolved photoemission and density functional theory, we establish that YTe${}_3$ is a CDW-induced Kramers nodal line (KNL) metal, a newly proposed topological state of matter. YTe${}_3$ is a non-magnetic quasi-2D chalcogenide with a CDW wave vector ($q_{\mathrm{cdw}}$) of 0.2907c${}^{\ast }$. Scanning tunneling microscopy and low energy electron diffraction revealed two orthogonal CDW domains, each with a unidirectional CDW and similar YTe${}_3$. The effective band structure (EBS) computations, using DFT-calculated folded bands, show excellent agreement with ARPES because a realistic x-ray crystal structure and twin domains are considered in the calculations. The Fermi surface and ARPES intensity plots show weak shadow bands displaced by $q_{\mathrm{cdw}}$ from the main bands. These are linked to CDW modulation, as the EBS calculation confirms. Bilayer split main and shadow bands suggest the existence of crossings, according to theory and experiment. DFT bands, including spin-orbit coupling, indicate a nodal line along the $\Sigma$ line from multiple band crossings perpendicular to the KNL. Additionally, doubly degenerate bands are only found along the KNL at all energies, with some bands dispersing through the Fermi level.

References in corpus (30)

• Quantum Spin Hall Effect and Topological Field Effect Transistor in Two-Dimensional Transition Metal Dichalcogenides
• High-throughput electronic band structure calculations: challenges and tools
• Dirac Line Nodes in Inversion Symmetric Crystals
• Topological Nodal Line Semimetal and Dirac Semimetal State in Antiperovskite Cu${}_3$PdN
• Topological quantum properties of chiral crystals
• PyProcar: A Python library for electronic structure pre/post-processing
• Unfolding first-principles band structures
• Potential ring of Dirac nodes in a new polymorph of Ca${}_3$P${}_2$
• Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV3Sb5 (A=Rb,Cs)
• Topological Nodal Line Semimetals in CaP3 family of materials
• ARPES Study of the Evolution of Band Structure and Charge Density Wave Properties in RTe3 for R = Y, La, Ce, Sm, Gd, Tb and Dy
• Raman signatures of inversion symmetry breaking and structural phase transition in type-II Weyl semimetal MoTe2
• A Charge-Density-Wave Topological Semimetal
• CaTe: a new topological node-line and Dirac semimetal
• Recovering hidden Bloch character: Unfolding Electrons, Phonons, and Slabs
• Topological charge density waves at half-integer filling of a moiré superlattice
• Raman Signatures of Broken Inversion Symmetry and In-plane Anisotropy in Type-II Weyl Semimetal Candidate TaIrTe4
• STM Studies of TbTe3: Evidence for a fully Incommensurate Charge Density Wave
• Band Engineering of Dirac Semimetals using Charge Density Waves
• Evidence for coupling between collective state and phonons in two-dimensional charge-density-wave systems
• Switching of band inversion and topological surface states by charge density wave
• Kramers Nodal Line Metals
• Eightfold Fermionic Excitation in a Charge Density Wave Compound
• Charge density wave induced nodal lines in LaTe${}_3$
• Kramers nodal lines and Weyl fermions in SmAlSi
• Fascinating interplay between Charge Density Wave Order and magnetic field in Non-magnetic Rare-Earth Tritelluride LaTe${}_3$
• Charge density wave-generated Fermi surfaces in NdTe${}_3$
• Interplay between multiple charge-density waves and the relationship with superconductivity in Pd${}_x$HoTe${}_3$
• Searching for topological density wave insulators in multi-orbital square lattice systems
• Aspects of symmetry and topology in the charge density wave phase of 1T-TiSe2