Energy Spectrum Theory of Incommensurate Systems
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866910459431485440 |
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| author | He, Zhe Guo, Xin-Yu Ma, Zhen Gao, Jin-hua |
| author_facet | He, Zhe Guo, Xin-Yu Ma, Zhen Gao, Jin-hua |
| contents | Due to the lack of the translational symmetry, calculating the energy spectrum of an incommensurate system has always been a theoretical challenge. Here, we propose a natural approach to generalize the energy band theory to the incommensurate systems without reliance on the commensurate approximation, thus providing a comprehensive energy spectrum theory of the incommensurate systems. Except for a truncation dependent weighting factor, the formulae of this theory are formally almost identical to that of the Bloch electrons, making it particularly suitable for complex incommensurate structures. To illustrate the application of this theory, we give three typical examples: one-dimensional bichromatic and trichromatic incommensurate potential model, as well as a moiré quasicrystal. Our theory establishes a fundamental framework for understanding the incommensurate systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_01367 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Energy Spectrum Theory of Incommensurate Systems He, Zhe Guo, Xin-Yu Ma, Zhen Gao, Jin-hua Mesoscale and Nanoscale Physics Other Condensed Matter Due to the lack of the translational symmetry, calculating the energy spectrum of an incommensurate system has always been a theoretical challenge. Here, we propose a natural approach to generalize the energy band theory to the incommensurate systems without reliance on the commensurate approximation, thus providing a comprehensive energy spectrum theory of the incommensurate systems. Except for a truncation dependent weighting factor, the formulae of this theory are formally almost identical to that of the Bloch electrons, making it particularly suitable for complex incommensurate structures. To illustrate the application of this theory, we give three typical examples: one-dimensional bichromatic and trichromatic incommensurate potential model, as well as a moiré quasicrystal. Our theory establishes a fundamental framework for understanding the incommensurate systems. |
| title | Energy Spectrum Theory of Incommensurate Systems |
| topic | Mesoscale and Nanoscale Physics Other Condensed Matter |
| url | https://arxiv.org/abs/2309.01367 |