Application of the renormalized random-phase approximation to polarized Fermi gases
| Autor: | David Durel, Michael Urban |
|---|---|
| Přispěvatelé: | Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Normal phase Crossover Polarization (waves) 01 natural sciences [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph] 010305 fluids & plasmas Matter waves and collective properties of cold atoms and molecules Pairing Quantum mechanics 0103 physical sciences Condensed Matter::Strongly Correlated Electrons Zero temperature 010306 general physics Random phase approximation Fermi gas Fermi Gamma-ray Space Telescope |
| Zdroj: | Phys.Rev.A Phys.Rev.A, 2020, 101 (1), pp.013608. ⟨10.1103/PhysRevA.101.013608⟩ |
| Popis: | International audience; We consider a spin-imbalanced Fermi gas at zero temperature in the normal phase on the BCS side of the BCS-BEC crossover and around unitarity. We compute the critical polarization for pairing, the correlated occupation numbers, and the contact in an extension of particle-particle random-phase approximation (RPA) (also called non-self-consistent T-matrix approach or ladder approximation). The so-called renormalized RPA consists in computing the T matrix with self-consistently determined occupation numbers. The occupation numbers are determined either by keeping the self-energy only to first order or by resumming the Dyson equation. In this way, the result for the critical polarization, strongly overestimated in standard RPA, is clearly improved. We also discuss some problems of this approach. |
| Databáze: | OpenAIRE |
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