Dirac nodal line and Rashba spin-split surface states in nonsymmorphic ZrGeTe
Journal
New Journal of Physics
Journal Volume
23
Journal Issue
10
Date Issued
2021
Author(s)
Abstract
Dirac semimetals (DSMs) are three-dimensional analogue to graphene with symmetry enforced bulk Dirac nodes. Among various DSMs, ZrSiS has attracted great interests recently, due to its three dimensional Dirac nodal line protected by the nonsymmorphic symmetry. It belongs to a large family of isostructural compounds with rich quantum phenomenon. Here we present a comprehensive study of the first principle calculation, angle-resolved photoemission spectroscopy measurements, and scanning tunneling microscope experiments on ZrGeTe, a member of the ZrSiS family with stronger spin-orbit coupling (SOC). Our band structure calculation shows Dirac line nodes along AM¯ and XR¯, the signature of linearly dispersive diamond-shaped band around Γ¯, and the existence of floating gapless surface states at X¯ with Rashba spin-split helical spin texture. Furthermore, characteristic q-vectors including two Umklapp scattering vectors revealed by our quasiparticle scattering interference imaging can be identified with joint density of states simulation based on our calculated band structure. Our results demonstrate the effects of large SOC on the electronic structure of ZrGeTe, which may benefit the potential application by utilizing its exotic quantum states in the future. ? 2021 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft.
Subjects
angle resolved photoemission spectroscopy (ARPES); Dirac nodal-line semimetals; first-principle calculation; nonsymmorphic symmetry; quasiparticle interference (QPI); Rashba effect; scanning tunneling microscopy (STM); Band structure; Electronic structure; Germanium alloys; Germanium compounds; Photoelectron spectroscopy; Quantum theory; Surface states; Tellurium compounds; Textures; Zirconium compounds; Angle resolved photoemission spectroscopy; Dirac nodal-line semimetal; First principle calculations; Nodal line; Nonsymmorphic symmetry; Quasiparticle interference; Quasiparticles; Rashba effects; Scanning tunneling microscopy; Scanning tunneling microscopy
Type
journal article