Low-dimensional fluctuations and pseudogap in Gaudin-Yang Fermi gases
The pseudogap is a ubiquitous phenomenon in strongly correlated systems, such as high-T_{c} superconductors, ultracold atoms, and nuclear physics. Whereas pairing fluctuations inducing the pseudogap are known to be enhanced in low-dimensional systems, such effects have not been explored well in one...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2020-09-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.033441 |
| _version_ | 1797211273545383936 |
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| author | Hiroyuki Tajima Shoichiro Tsutsui Takahiro M. Doi |
| author_facet | Hiroyuki Tajima Shoichiro Tsutsui Takahiro M. Doi |
| author_sort | Hiroyuki Tajima |
| collection | DOAJ |
| description | The pseudogap is a ubiquitous phenomenon in strongly correlated systems, such as high-T_{c} superconductors, ultracold atoms, and nuclear physics. Whereas pairing fluctuations inducing the pseudogap are known to be enhanced in low-dimensional systems, such effects have not been explored well in one of the most fundamental one-dimensional models, that is, Gaudin-Yang model. In this paper, we show how the pseudogap effect emerges in the single-particle excitation in this system using a diagrammatic approach. Fermionic single-particle spectra exhibit a unique crossover from the double-particle dispersion to the pseudogap state with increasing the attractive interaction and the number density at finite temperature. Surprisingly, our results of thermodynamic quantities in unpolarized and polarized gases show an excellent agreement with the recent quantum Monte Carlo and complex Langevin results, indicating the validity of our approach even in the region where the pseudogap appears. |
| first_indexed | 2024-04-24T10:23:52Z |
| format | Article |
| id | doaj.art-81613c8c2297442e925db120528b597b |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:23:52Z |
| publishDate | 2020-09-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-81613c8c2297442e925db120528b597b2024-04-12T17:00:49ZengAmerican Physical SocietyPhysical Review Research2643-15642020-09-012303344110.1103/PhysRevResearch.2.033441Low-dimensional fluctuations and pseudogap in Gaudin-Yang Fermi gasesHiroyuki TajimaShoichiro TsutsuiTakahiro M. DoiThe pseudogap is a ubiquitous phenomenon in strongly correlated systems, such as high-T_{c} superconductors, ultracold atoms, and nuclear physics. Whereas pairing fluctuations inducing the pseudogap are known to be enhanced in low-dimensional systems, such effects have not been explored well in one of the most fundamental one-dimensional models, that is, Gaudin-Yang model. In this paper, we show how the pseudogap effect emerges in the single-particle excitation in this system using a diagrammatic approach. Fermionic single-particle spectra exhibit a unique crossover from the double-particle dispersion to the pseudogap state with increasing the attractive interaction and the number density at finite temperature. Surprisingly, our results of thermodynamic quantities in unpolarized and polarized gases show an excellent agreement with the recent quantum Monte Carlo and complex Langevin results, indicating the validity of our approach even in the region where the pseudogap appears.http://doi.org/10.1103/PhysRevResearch.2.033441 |
| spellingShingle | Hiroyuki Tajima Shoichiro Tsutsui Takahiro M. Doi Low-dimensional fluctuations and pseudogap in Gaudin-Yang Fermi gases Physical Review Research |
| title | Low-dimensional fluctuations and pseudogap in Gaudin-Yang Fermi gases |
| title_full | Low-dimensional fluctuations and pseudogap in Gaudin-Yang Fermi gases |
| title_fullStr | Low-dimensional fluctuations and pseudogap in Gaudin-Yang Fermi gases |
| title_full_unstemmed | Low-dimensional fluctuations and pseudogap in Gaudin-Yang Fermi gases |
| title_short | Low-dimensional fluctuations and pseudogap in Gaudin-Yang Fermi gases |
| title_sort | low dimensional fluctuations and pseudogap in gaudin yang fermi gases |
| url | http://doi.org/10.1103/PhysRevResearch.2.033441 |
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