Pair correlations in the attractive Hubbard model
The mechanism of fermionic pairing is the key to understanding various phenomena such as high-temperature superconductivity and the pseudogap phase in cuprate materials. We study the pair correlations in the attractive Hubbard model using ultracold fermions in a two-dimensional optical lattice. By c...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2020-05-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.023210 |
| _version_ | 1797211426505359360 |
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| author | C. F. Chan M. Gall N. Wurz M. Köhl |
| author_facet | C. F. Chan M. Gall N. Wurz M. Köhl |
| author_sort | C. F. Chan |
| collection | DOAJ |
| description | The mechanism of fermionic pairing is the key to understanding various phenomena such as high-temperature superconductivity and the pseudogap phase in cuprate materials. We study the pair correlations in the attractive Hubbard model using ultracold fermions in a two-dimensional optical lattice. By combining the fluctuation-dissipation theorem and the compressibility equation of state, we extract the interacting pair-correlation functions and deduce a characteristic length scale of pairs as a function of interaction and density filling. At sufficiently low filling and weak onsite interaction, we observe that the pair correlations extend over a few lattice sites even at temperatures above the superfluid transition temperature. |
| first_indexed | 2024-04-24T10:26:18Z |
| format | Article |
| id | doaj.art-c500d6bac9e24d428e900f3233928b06 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:26:18Z |
| publishDate | 2020-05-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-c500d6bac9e24d428e900f3233928b062024-04-12T16:54:19ZengAmerican Physical SocietyPhysical Review Research2643-15642020-05-012202321010.1103/PhysRevResearch.2.023210Pair correlations in the attractive Hubbard modelC. F. ChanM. GallN. WurzM. KöhlThe mechanism of fermionic pairing is the key to understanding various phenomena such as high-temperature superconductivity and the pseudogap phase in cuprate materials. We study the pair correlations in the attractive Hubbard model using ultracold fermions in a two-dimensional optical lattice. By combining the fluctuation-dissipation theorem and the compressibility equation of state, we extract the interacting pair-correlation functions and deduce a characteristic length scale of pairs as a function of interaction and density filling. At sufficiently low filling and weak onsite interaction, we observe that the pair correlations extend over a few lattice sites even at temperatures above the superfluid transition temperature.http://doi.org/10.1103/PhysRevResearch.2.023210 |
| spellingShingle | C. F. Chan M. Gall N. Wurz M. Köhl Pair correlations in the attractive Hubbard model Physical Review Research |
| title | Pair correlations in the attractive Hubbard model |
| title_full | Pair correlations in the attractive Hubbard model |
| title_fullStr | Pair correlations in the attractive Hubbard model |
| title_full_unstemmed | Pair correlations in the attractive Hubbard model |
| title_short | Pair correlations in the attractive Hubbard model |
| title_sort | pair correlations in the attractive hubbard model |
| url | http://doi.org/10.1103/PhysRevResearch.2.023210 |
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