{"doi":"10.1103/physreva.106.033303","title":"Normal state of attractive Fermi gases from coupled-cluster theory","abstract":"We apply coupled-cluster (CC) theory to numerically study the normal state of two-component dilute Fermi gases with attractive short-range interactions at zero temperature. We focus on CC theory with double excitations (CCD) and discuss its close relationship with---and improvement upon---the $t$-matrix approximation, i.e., the resummation of ladder diagrams via a random-phase approximation. We further discuss its relationship with Chevy's variational wave-function ansatz for the Fermi polaron and argue that CCD is its natural extension to nonzero minority species concentrations. Studying normal-state energetics for a range of interaction strengths below and above unitarity, we find that CCD yields good agreement with fixed-node diffusion Monte Carlo. We find that CCD does not converge for small polarizations and large interaction strengths, which we speculatively attribute to the nascent instability to a superfluid state.","journal":"Physical review. A/Physical review, A","year":2022,"id":308764,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":0,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9508,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2022-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":744549,"name":"John Sous","orcid":"0000-0002-9994-5789","position":1,"is_corresponding":false},{"id":430151,"name":"Timothy C. Berkelbach","orcid":"0000-0002-7445-2136","position":2,"is_corresponding":false},{"id":728622,"name":"James M. Callahan","orcid":"0000-0002-7756-116X","position":0,"is_corresponding":true}],"reference_count":145,"raw_metadata":null,"created_at":"2026-07-19T00:33:07.132912Z","pmid":null,"pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}