Equality of magnetization and edge current for interacting lattice fermions at positive temperature
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| Format: | Preprint |
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2024
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| _version_ | 1866909411087220736 |
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| author | Lampart, Jonas Moscolari, Massimo Teufel, Stefan Wessel, Tom |
| author_facet | Lampart, Jonas Moscolari, Massimo Teufel, Stefan Wessel, Tom |
| contents | We prove that the magnetization is equal to the edge current in the thermodynamic limit for a large class of models of lattice fermions with finite-range interactions satisfying local indistinguishability of the Gibbs state, a condition known to hold for sufficiently high temperatures. Our result implies that edge currents in such systems are determined by bulk properties and are therefore stable against large perturbations near the boundaries. Moreover, the equality persists also after taking the derivative with respect to the chemical potential. We show that this form of bulk-edge correspondence is essentially a consequence of homogeneity in the bulk and locality of the Gibbs state. An important intermediate result is a new version of Bloch's theorem for two-dimensional systems, stating that persistent currents vanish in the bulk. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_17566 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Equality of magnetization and edge current for interacting lattice fermions at positive temperature Lampart, Jonas Moscolari, Massimo Teufel, Stefan Wessel, Tom Mathematical Physics Mesoscale and Nanoscale Physics Quantum Physics 81V70, 81V74 We prove that the magnetization is equal to the edge current in the thermodynamic limit for a large class of models of lattice fermions with finite-range interactions satisfying local indistinguishability of the Gibbs state, a condition known to hold for sufficiently high temperatures. Our result implies that edge currents in such systems are determined by bulk properties and are therefore stable against large perturbations near the boundaries. Moreover, the equality persists also after taking the derivative with respect to the chemical potential. We show that this form of bulk-edge correspondence is essentially a consequence of homogeneity in the bulk and locality of the Gibbs state. An important intermediate result is a new version of Bloch's theorem for two-dimensional systems, stating that persistent currents vanish in the bulk. |
| title | Equality of magnetization and edge current for interacting lattice fermions at positive temperature |
| topic | Mathematical Physics Mesoscale and Nanoscale Physics Quantum Physics 81V70, 81V74 |
| url | https://arxiv.org/abs/2403.17566 |