The Uhlmann phase of Higher-Order Topological Insulators at Finite Temperature
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866914619716534272 |
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| author | Chen, Shiyu He, Yan |
| author_facet | Chen, Shiyu He, Yan |
| contents | We have studied the finite-temperature topology of higher-order topological insulators (HOTIs) based on the Uhlmann phase, which is a phase angle of the Uhlmann overlap. As an example of HOTIs, the Hamiltonian of the Benalcazar-Bernevig-Hughes (BBH) model is constructed from Gamma matrices satisfying the Clifford algebra. This specific algebraic structure underpins the model's higher-order topological properties, including the quantization of the Uhlmann phase to $0$ or $π$. This quantization enables us to treat the abrupt jumps of the Uhlmann phase as an indication of the nontrivial topological phase of the BBH model at finite temperature. From the disappearance of these jumps, we determine the critical temperature at which the topological transition occurs. For a special choice of parameters, the Uhlmann overlap and the critical temperature can be computed analytically. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2606_00479 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The Uhlmann phase of Higher-Order Topological Insulators at Finite Temperature Chen, Shiyu He, Yan Mesoscale and Nanoscale Physics We have studied the finite-temperature topology of higher-order topological insulators (HOTIs) based on the Uhlmann phase, which is a phase angle of the Uhlmann overlap. As an example of HOTIs, the Hamiltonian of the Benalcazar-Bernevig-Hughes (BBH) model is constructed from Gamma matrices satisfying the Clifford algebra. This specific algebraic structure underpins the model's higher-order topological properties, including the quantization of the Uhlmann phase to $0$ or $π$. This quantization enables us to treat the abrupt jumps of the Uhlmann phase as an indication of the nontrivial topological phase of the BBH model at finite temperature. From the disappearance of these jumps, we determine the critical temperature at which the topological transition occurs. For a special choice of parameters, the Uhlmann overlap and the critical temperature can be computed analytically. |
| title | The Uhlmann phase of Higher-Order Topological Insulators at Finite Temperature |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2606.00479 |