Tunable high spin Chern-number insulator phases in strained Sb monolayer

Jacob Cook; Po Yuan Yang; Theo Volz; Clayton Conner; Riley Satterfield; Joseph Berglund; Qiangsheng Lu; Rob G. Moore; Yueh Ting Yao; Tay Rong Chang; Guang Bian

doi:10.1016/j.mtphys.2025.101664

Tunable high spin Chern-number insulator phases in strained Sb monolayer

Jacob Cook
, Po Yuan Yang
, Theo Volz
, Clayton Conner
, Riley Satterfield
, Joseph Berglund
, Qiangsheng Lu
, Rob G. Moore
, Yueh Ting Yao
, Tay Rong Chang
, Guang Bian

Quantum Heterostructures

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

Abstract

High spin Chern-number insulators (HSCI) have emerged as a novel 2D topological phase of condensed matter that is beyond the classification of topological quantum chemistry. The HSCI phase with two pairs of gapless helical edge states is robust even in the presence of spin–orbit coupling due to the protection of a “hidden” feature spectrum topology. In this work, we report the observation of a semimetallic Sb monolayer carrying the same band topology as HSCI with the spin Chern number equal to 2. Our calculations further indicate a moderate lattice strain can make Sb monolayer an insulator or a semimetal with a tunable spin Chern number from 0 to 3. The results suggest strained Sb monolayers as a promising platform for exploring exotic properties of the HSCI topological matter.

Original language	English
Article number	101664
Journal	Materials Today Physics
Volume	51
DOIs	https://doi.org/10.1016/j.mtphys.2025.101664
State	Published - Feb 2025

Funding

The work at the University of Missouri was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering, under Grant No. DE-SC0024294. G.B. was supported by the Gordon and Betty Moore Foundation, grant DOI 10.37807/gbmf12247. Portions of this work at Oak Ridge National Laboratory were supported by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Quantum Science Center (Q. L. and R. G. M.). T.-R.C. was supported by the National Science and Technology Council (NSTC) in Taiwan (Program No. MOST111-2628-M-006-003-MY3 and NSTC113-2124-M-006-009-MY3), National Cheng Kung University (NCKU), Taiwan, and National Center for Theoretical Sciences, Taiwan. This research was supported, in part, by the Higher Education Sprout Project, Ministry of Education to the Headquarters of University Advancement at NCKU. T.-R.C. thanks the National Center for Highperformance Computing (NCHC) of National Applied Research Laboratories (NARLabs) in Taiwan for providing computational and storage resources. The work at the University of Missouri was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering, under Grant No. DE-SC0024294 . G.B. was supported by the Gordon and Betty Moore Foundation , grant DOI 10.37807/gbmf12247 . Portions of this work at Oak Ridge National Laboratory were supported by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Quantum Science Center (Q. L. and R. G. M.) . T.-R.C. was supported by the 2030 Cross-Generation Young Scholars Program from the National Science and Technology Council (NSTC) in Taiwan (Program No. MOST111-2628-M-006-003-MY3 ), National Cheng Kung University (NCKU), Taiwan , and National Center for Theoretical Sciences, Taiwan . This research was supported, in part, by Higher Education Sprout Project, Ministry of Education to the Headquarters of University Advancement at NCKU .

Keywords

High spin Chern-number insulator
Molecular beam epitaxy
Sb monolayer
Topological quantum chemistry

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10.1016/j.mtphys.2025.101664

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title = "Tunable high spin Chern-number insulator phases in strained Sb monolayer",

abstract = "High spin Chern-number insulators (HSCI) have emerged as a novel 2D topological phase of condensed matter that is beyond the classification of topological quantum chemistry. The HSCI phase with two pairs of gapless helical edge states is robust even in the presence of spin–orbit coupling due to the protection of a “hidden” feature spectrum topology. In this work, we report the observation of a semimetallic Sb monolayer carrying the same band topology as HSCI with the spin Chern number equal to 2. Our calculations further indicate a moderate lattice strain can make Sb monolayer an insulator or a semimetal with a tunable spin Chern number from 0 to 3. The results suggest strained Sb monolayers as a promising platform for exploring exotic properties of the HSCI topological matter.",

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AU - Cook, Jacob

AU - Yang, Po Yuan

AU - Volz, Theo

AU - Conner, Clayton

AU - Satterfield, Riley

AU - Berglund, Joseph

AU - Lu, Qiangsheng

AU - Moore, Rob G.

AU - Yao, Yueh Ting

AU - Chang, Tay Rong

AU - Bian, Guang

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AB - High spin Chern-number insulators (HSCI) have emerged as a novel 2D topological phase of condensed matter that is beyond the classification of topological quantum chemistry. The HSCI phase with two pairs of gapless helical edge states is robust even in the presence of spin–orbit coupling due to the protection of a “hidden” feature spectrum topology. In this work, we report the observation of a semimetallic Sb monolayer carrying the same band topology as HSCI with the spin Chern number equal to 2. Our calculations further indicate a moderate lattice strain can make Sb monolayer an insulator or a semimetal with a tunable spin Chern number from 0 to 3. The results suggest strained Sb monolayers as a promising platform for exploring exotic properties of the HSCI topological matter.

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KW - Molecular beam epitaxy

KW - Sb monolayer

KW - Topological quantum chemistry

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Tunable high spin Chern-number insulator phases in strained Sb monolayer

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