Controlling quantum phases with electric fields in one-dimensional Hubbard systems
Fuente:
arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866910959508914176 |
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| author | Arisa, D. Santos, R. M. Dos Carvalho, Isaac M. França, Vivian V. |
| author_facet | Arisa, D. Santos, R. M. Dos Carvalho, Isaac M. França, Vivian V. |
| contents | Quantum systems under electric fields provide a powerful framework for uncovering and controlling novel quantum phases, especially in low-dimensional systems with strong correlations. In this work, we investigate quantum phase transitions induced by an electric potential difference in a one-dimensional half-filled Hubbard chain. By analyzing (i) tunneling and pairing mechanisms, (ii) charge and spin gaps, and (iii) entanglement between the chain halves, we identify three distinct phases: Mott insulator, metal and band-like insulator. The metallic regime, characterized by the closing of both charge and spin gaps, is accompanied by a field-dependent kinetic energy and a quasi-periodic oscillatory behavior of pairing response and entanglement. Although the metallic phase persists for different magnetizations, its extent in the phase diagram shrinks as spin polarization increases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_15449 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Controlling quantum phases with electric fields in one-dimensional Hubbard systems Arisa, D. Santos, R. M. Dos Carvalho, Isaac M. França, Vivian V. Strongly Correlated Electrons Quantum systems under electric fields provide a powerful framework for uncovering and controlling novel quantum phases, especially in low-dimensional systems with strong correlations. In this work, we investigate quantum phase transitions induced by an electric potential difference in a one-dimensional half-filled Hubbard chain. By analyzing (i) tunneling and pairing mechanisms, (ii) charge and spin gaps, and (iii) entanglement between the chain halves, we identify three distinct phases: Mott insulator, metal and band-like insulator. The metallic regime, characterized by the closing of both charge and spin gaps, is accompanied by a field-dependent kinetic energy and a quasi-periodic oscillatory behavior of pairing response and entanglement. Although the metallic phase persists for different magnetizations, its extent in the phase diagram shrinks as spin polarization increases. |
| title | Controlling quantum phases with electric fields in one-dimensional Hubbard systems |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2505.15449 |