Quantum vs thermal fluctuations in phase transitions of two-dimensional superconductors
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866918261336047616 |
|---|---|
| author | Ponticelli, Andrea Capone, Francesco Giuseppe Cataudella, Vittorio De Filippis, Giulio De Candia, Antonio Perroni, Carmine Antonio |
| author_facet | Ponticelli, Andrea Capone, Francesco Giuseppe Cataudella, Vittorio De Filippis, Giulio De Candia, Antonio Perroni, Carmine Antonio |
| contents | We investigate the impact of quantum and thermal phase fluctuations on the suppression of superconducting order in two-dimensional systems. Within the two-dimensional quantum XY model in the phase representation, where on-site interaction terms govern quantum phase fluctuations, we perform extensive path-integral quantum Monte Carlo simulations. The resulting temperature-interaction phase diagram establishes the presence of a well-defined critical line ending at a quantum critical point at vanishing temperature with no indication of reentrant behavior. We further demonstrate that the resistance above the critical line reproduces the two expected different critical behaviors. For stronger interactions, above the quantum critical point, the system exhibits a crossover to an insulating regime at low temperatures. Finally, Monte Carlo calculations of current-current correlation functions enable us to extract the frequency-dependent conductivity in both superconducting and normal regimes, revealing a finite-frequency response that we attribute to quantum phase fluctuations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_20476 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum vs thermal fluctuations in phase transitions of two-dimensional superconductors Ponticelli, Andrea Capone, Francesco Giuseppe Cataudella, Vittorio De Filippis, Giulio De Candia, Antonio Perroni, Carmine Antonio Strongly Correlated Electrons Superconductivity 82D55 We investigate the impact of quantum and thermal phase fluctuations on the suppression of superconducting order in two-dimensional systems. Within the two-dimensional quantum XY model in the phase representation, where on-site interaction terms govern quantum phase fluctuations, we perform extensive path-integral quantum Monte Carlo simulations. The resulting temperature-interaction phase diagram establishes the presence of a well-defined critical line ending at a quantum critical point at vanishing temperature with no indication of reentrant behavior. We further demonstrate that the resistance above the critical line reproduces the two expected different critical behaviors. For stronger interactions, above the quantum critical point, the system exhibits a crossover to an insulating regime at low temperatures. Finally, Monte Carlo calculations of current-current correlation functions enable us to extract the frequency-dependent conductivity in both superconducting and normal regimes, revealing a finite-frequency response that we attribute to quantum phase fluctuations. |
| title | Quantum vs thermal fluctuations in phase transitions of two-dimensional superconductors |
| topic | Strongly Correlated Electrons Superconductivity 82D55 |
| url | https://arxiv.org/abs/2512.20476 |