Spin-valley polarized edge states in quasi-one-dimensional asymmetric kagome lattice
The spin-valley-related electronic properties of quasi-one-dimensional kagome lattices with intrinsic spin-orbit coupling are studied, based on the tight-binding formalism. Three types of kagome-lattice nanoribbons along the x-direction with various geometric boundaries are proposed, including two s...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-11-01
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| Series: | Frontiers in Physics |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fphy.2022.1033836/full |
| _version_ | 1811232793884098560 |
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| author | Yun-Lei Sun Guo-Hong Chen Si-Chao Du Zhong-Bao Chen Yan-Wei Zhou En-Jia Ye |
| author_facet | Yun-Lei Sun Guo-Hong Chen Si-Chao Du Zhong-Bao Chen Yan-Wei Zhou En-Jia Ye |
| author_sort | Yun-Lei Sun |
| collection | DOAJ |
| description | The spin-valley-related electronic properties of quasi-one-dimensional kagome lattices with intrinsic spin-orbit coupling are studied, based on the tight-binding formalism. Three types of kagome-lattice nanoribbons along the x-direction with various geometric boundaries are proposed, including two symmetric nanoribbons and one asymmetric one. It is found that two nonequivalent Dirac cones and helical edge states exist in all the three types of kagome-lattice nanoribbons at 1/3 filling. Among them in the asymmetric nanoribbon, the spin and valley are found to be locked to each other due to inversion symmetry breaking, resulting in spin-valley polarized edge states. Band structure and probability density of wave function show that the spin-up/-down edge states locate at the K/K′ valley, with opposite propagation direction at the upper and lower boundaries. Spin-resolved real-space local current confirms the spin-valley polarized helical edge state in the asymmetric nanoribbon. The device application of the asymmetric kagome-lattice nanoribbon is worth further investigation. |
| first_indexed | 2024-04-12T11:09:22Z |
| format | Article |
| id | doaj.art-9f3e89b7502849ea87c2b75b7bd1ff67 |
| institution | Directory Open Access Journal |
| issn | 2296-424X |
| language | English |
| last_indexed | 2024-04-12T11:09:22Z |
| publishDate | 2022-11-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Physics |
| spelling | doaj.art-9f3e89b7502849ea87c2b75b7bd1ff672022-12-22T03:35:39ZengFrontiers Media S.A.Frontiers in Physics2296-424X2022-11-011010.3389/fphy.2022.10338361033836Spin-valley polarized edge states in quasi-one-dimensional asymmetric kagome latticeYun-Lei Sun0Guo-Hong Chen1Si-Chao Du2Zhong-Bao Chen3Yan-Wei Zhou4En-Jia Ye5School of Information and Electrical Engineering, Zhejiang University City College, Hangzhou, ChinaSchool of Information and Electrical Engineering, Zhejiang University City College, Hangzhou, ChinaSchool of Information and Electrical Engineering, Zhejiang University City College, Hangzhou, ChinaSchool of Information and Electrical Engineering, Zhejiang University City College, Hangzhou, ChinaSchool of Information and Electrical Engineering, Zhejiang University City College, Hangzhou, ChinaJiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, School of Science, Jiangnan University, Wuxi, ChinaThe spin-valley-related electronic properties of quasi-one-dimensional kagome lattices with intrinsic spin-orbit coupling are studied, based on the tight-binding formalism. Three types of kagome-lattice nanoribbons along the x-direction with various geometric boundaries are proposed, including two symmetric nanoribbons and one asymmetric one. It is found that two nonequivalent Dirac cones and helical edge states exist in all the three types of kagome-lattice nanoribbons at 1/3 filling. Among them in the asymmetric nanoribbon, the spin and valley are found to be locked to each other due to inversion symmetry breaking, resulting in spin-valley polarized edge states. Band structure and probability density of wave function show that the spin-up/-down edge states locate at the K/K′ valley, with opposite propagation direction at the upper and lower boundaries. Spin-resolved real-space local current confirms the spin-valley polarized helical edge state in the asymmetric nanoribbon. The device application of the asymmetric kagome-lattice nanoribbon is worth further investigation.https://www.frontiersin.org/articles/10.3389/fphy.2022.1033836/fullkagome-lattice nanoribbonspin-valley polarizationedge statesspin-orbit couplinglocal current |
| spellingShingle | Yun-Lei Sun Guo-Hong Chen Si-Chao Du Zhong-Bao Chen Yan-Wei Zhou En-Jia Ye Spin-valley polarized edge states in quasi-one-dimensional asymmetric kagome lattice Frontiers in Physics kagome-lattice nanoribbon spin-valley polarization edge states spin-orbit coupling local current |
| title | Spin-valley polarized edge states in quasi-one-dimensional asymmetric kagome lattice |
| title_full | Spin-valley polarized edge states in quasi-one-dimensional asymmetric kagome lattice |
| title_fullStr | Spin-valley polarized edge states in quasi-one-dimensional asymmetric kagome lattice |
| title_full_unstemmed | Spin-valley polarized edge states in quasi-one-dimensional asymmetric kagome lattice |
| title_short | Spin-valley polarized edge states in quasi-one-dimensional asymmetric kagome lattice |
| title_sort | spin valley polarized edge states in quasi one dimensional asymmetric kagome lattice |
| topic | kagome-lattice nanoribbon spin-valley polarization edge states spin-orbit coupling local current |
| url | https://www.frontiersin.org/articles/10.3389/fphy.2022.1033836/full |
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