Effects of intra-layer correlations on electron-hole double-layer superfluidity
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866916162400419840 |
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| author | Pascucci, Filippo Conti, Sara Perali, Andrea Tempere, Jacques Neilson, David |
| author_facet | Pascucci, Filippo Conti, Sara Perali, Andrea Tempere, Jacques Neilson, David |
| contents | We investigate the correlations acting within the layers in a superfluid system of electron-hole spatially separated layers. In this system of quasi-dipoles, the dominant correlations are Hartree--Fock. We find in the BEC regime of the superfluid where screening is negligible, that the effect of the correlations on superfluid properties is also negligible. However, in the BCS-BEC crossover regime, where the screening plays a crucial role, we find that the superfluid gap is significantly weakened because the correlations significantly boost the number of low-energy particle-hole excitations participating in the screening process. Finally, the intralayer correlations are found in this system to suppress a predicted phenomenon in which the average pair size passes through a minimum as the crossover regime is traversed. In the presence of intralayer correlations, the minimum is either extremely weak or completely absent. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_12117 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Effects of intra-layer correlations on electron-hole double-layer superfluidity Pascucci, Filippo Conti, Sara Perali, Andrea Tempere, Jacques Neilson, David Superconductivity We investigate the correlations acting within the layers in a superfluid system of electron-hole spatially separated layers. In this system of quasi-dipoles, the dominant correlations are Hartree--Fock. We find in the BEC regime of the superfluid where screening is negligible, that the effect of the correlations on superfluid properties is also negligible. However, in the BCS-BEC crossover regime, where the screening plays a crucial role, we find that the superfluid gap is significantly weakened because the correlations significantly boost the number of low-energy particle-hole excitations participating in the screening process. Finally, the intralayer correlations are found in this system to suppress a predicted phenomenon in which the average pair size passes through a minimum as the crossover regime is traversed. In the presence of intralayer correlations, the minimum is either extremely weak or completely absent. |
| title | Effects of intra-layer correlations on electron-hole double-layer superfluidity |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2310.12117 |