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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2311.10024 |
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| _version_ | 1866918087938277376 |
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| author | Paoletti, Francesca Fanfarillo, Laura Capone, Massimo Amaricci, Adriano |
| author_facet | Paoletti, Francesca Fanfarillo, Laura Capone, Massimo Amaricci, Adriano |
| contents | Topological phase transitions are typically associated with the formation of gapless states. Spontaneous symmetry breaking can lead to a gap opening thereby obliterating the topological nature of the system. Here we highlight a completely different destiny for a topological transition in presence of interaction. Solving a Bernevig-Hughes-Zhang model with local interaction, we show that dynamical quantum fluctuations can lead to the opening of a gap without any symmetry breaking. As we vary the interaction and the bare mass of the model, the continuous gapless topological transition turns into a first-order one, associated with the presence of massive Dirac fermion at the transition point showing a Gross-Neveu critical behaviour near the quantum critical endpoint. We identify the gap opening as a condensed matter analog of the Coleman-Weinberg mechanism of mass generation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_10024 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Topological Gap Opening without Symmetry Breaking from Dynamical Quantum Correlations Paoletti, Francesca Fanfarillo, Laura Capone, Massimo Amaricci, Adriano Strongly Correlated Electrons Topological phase transitions are typically associated with the formation of gapless states. Spontaneous symmetry breaking can lead to a gap opening thereby obliterating the topological nature of the system. Here we highlight a completely different destiny for a topological transition in presence of interaction. Solving a Bernevig-Hughes-Zhang model with local interaction, we show that dynamical quantum fluctuations can lead to the opening of a gap without any symmetry breaking. As we vary the interaction and the bare mass of the model, the continuous gapless topological transition turns into a first-order one, associated with the presence of massive Dirac fermion at the transition point showing a Gross-Neveu critical behaviour near the quantum critical endpoint. We identify the gap opening as a condensed matter analog of the Coleman-Weinberg mechanism of mass generation. |
| title | Topological Gap Opening without Symmetry Breaking from Dynamical Quantum Correlations |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2311.10024 |