| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Intrinsic higher-order topological states in two-dimensional honeycomb quantum spin Hall insulators |
| Sibin Lü(吕思彬) and Jun Hu(胡军)† |
| Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, China |
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Abstract The exploration of topological phases remains a cutting-edge research frontier, driven by their promising potential for next-generation electronic and quantum technologies. In this work, we employ first-principles calculations and tight-binding modeling to systematically investigate the topological properties of freestanding two-dimensional (2D) honeycomb Bi, HgTe, and Al$_{2}$O$_{3}$(0001)-supported HgTe. Remarkably, all three systems exhibit coexistence of intrinsic first- and higher-order topological insulator states, induced by spin-orbit coupling (SOC). These states manifest as topologically protected gapless edge states in one-dimensional (1D) nanoribbons and symmetry-related corner states in zero-dimensional (0D) nanoflakes. Furthermore, fractional electron charges may accumulate at the corners of armchair-edged nanoflakes. Among these materials, HgTe/Al$_{2}$O$_{3}$(0001) is particularly promising due to its experimentally feasible atomic configuration and low-energy corner states. Our findings highlight the importance of exploring higher-order topological phases in quantum spin Hall insulators and pave the way for new possibilities in device applications.
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Received: 05 April 2025
Revised: 23 May 2025
Accepted manuscript online: 26 May 2025
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PACS:
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73.20.At
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(Surface states, band structure, electron density of states)
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73.22.-f
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(Electronic structure of nanoscale materials and related systems)
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03.65.Vf
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(Phases: geometric; dynamic or topological)
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| Fund: Project supported by the Program for Science and Technology Innovation Team in Zhejiang Province, China (Grant No. 2021R01004), the Six Talent Peaks Project of Jiangsu Province, China (Grant No. 2019-XCL-081), and the Startup Funding of Ningbo University and Yongjiang Recruitment Project (Grant No. 432200942). |
Corresponding Authors:
Jun Hu
E-mail: hujun2@nbu.edu.cn
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| About author: 2025-117303-250588.pdf |
Cite this article:
Sibin Lü(吕思彬) and Jun Hu(胡军) Intrinsic higher-order topological states in two-dimensional honeycomb quantum spin Hall insulators 2025 Chin. Phys. B 34 117303
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