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

doi:10.1021/acsnano.2c04301

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

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 language	English
Pages (from-to)	11227-11233
Number of pages	7
Journal	ACS Nano
Volume	16
Issue number	7
DOIs	https://doi.org/10.1021/acsnano.2c04301
State	Published - 26 Jul 2022

Keywords

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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title = "Controlling Spin-Orbit Coupling to Tailor Type-II Dirac Bands",

abstract = "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.",

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

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

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doi = "10.1021/acsnano.2c04301",

language = "English",

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T1 - Controlling Spin-Orbit Coupling to Tailor Type-II Dirac Bands

AU - Lam, Nguyen Huu

AU - Nguyen, Phuong Lien

AU - Choi, Byoung Ki

AU - Ly, Trinh Thi

AU - Duvjir, Ganbat

AU - Rhee, Tae Gyu

AU - Jo, Yong Jin

AU - Kim, Tae Heon

AU - Jozwiak, Chris

AU - Bostwick, Aaron

AU - Rotenberg, Eli

AU - Hwang, Younghun

AU - Chang, Young Jun

AU - Lee, Jaekwang

AU - Kim, Jungdae

PY - 2022/7/26

Y1 - 2022/7/26

N2 - 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.

AB - 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.

KW - NiTe

KW - NiTeSe

KW - angle-resolved photoelectron spectroscopy

KW - density functional theory

KW - scanning tunneling microscopy/scanning tunneling spectroscopy

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KW - type-II Dirac band

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

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