Controlling Spin-Orbit Coupling to Tailor Type-II Dirac Bands

Nguyen Huu Lam, Phuong Lien Nguyen, Byoung Ki Choi, Trinh Thi Ly, Ganbat Duvjir, Tae Gyu Rhee, Yong Jin Jo, Tae Heon Kim, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Younghun Hwang, Young Jun Chang, Jaekwang Lee, Jungdae Kim

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


NiTe2, a type-II Dirac semimetal with a strongly tilted Dirac band, has been explored extensively to understand its intriguing topological properties. Here, using density functional theory calculations, we report that the strength of the spin-orbit coupling (SOC) in NiTe2 can be tuned by Se substitution. This results in negative shifts of the bulk Dirac point (BDP) while preserving the type-II Dirac band. Indeed, combined studies using scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy confirm that the BDP in the NiTe2-xSex alloy moves from +0.1 eV (NiTe2) to -0.3 eV (NiTeSe) depending on the Se concentrations, indicating the effective tunability of type-II Dirac Fermions. Our results demonstrate an approach to tailor the type-II Dirac band in NiTe2 by controlling the SOC strength via chalcogen substitution. This approach can be applicable to different types of topological materials.

Original languageEnglish
Pages (from-to)11227-11233
Number of pages7
JournalACS Nano
Issue number7
StatePublished - 26 Jul 2022


  • NiTe
  • NiTeSe
  • angle-resolved photoelectron spectroscopy
  • density functional theory
  • scanning tunneling microscopy/scanning tunneling spectroscopy
  • spin-orbit coupling
  • type-II Dirac band


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