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Condensed Matter > Materials Science

arXiv:2310.14202 (cond-mat)
[Submitted on 22 Oct 2023]

Title:Controlling spin-orbit coupling to tailor type-II Dirac bands

Authors: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
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Abstract:NiTe2, a type-II Dirac semimetal with strongly tilted Dirac band, has been explored extensively to understand its intriguing topological properties. Here, using density-functional theory (DFT) calculations, we report that the strength of 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 (STS) and angle-resolved photoemission spectroscopy (ARPES) 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.
Comments: 25 pages, 4 figures
Subjects: Materials Science (cond-mat.mtrl-sci); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Strongly Correlated Electrons (cond-mat.str-el)
Cite as: arXiv:2310.14202 [cond-mat.mtrl-sci]
  (or arXiv:2310.14202v1 [cond-mat.mtrl-sci] for this version)
  https://doi.org/10.48550/arXiv.2310.14202
Journal reference: ACS Nano 16, 11227 (2022)
Related DOI: https://doi.org/10.1021/acsnano.2c04301

Submission history

From: Young Jun Chang [view email]
[v1] Sun, 22 Oct 2023 06:34:22 UTC (838 KB)
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