20.500.12556/RUL-167665 Signature of preformed pairs in angle-resolved photoemission spectroscopy We use density matrix renormalization group (DMRG) and variational exact diagonalization (VED) to calculate the single-electron removal spectral weight for the Hubbard-Holstein model at low electron densities. Tuning the strength of the electron-phonon coupling and of the Hubbard repulsion allows us to contrast the results for a liquid of polarons versus a liquid of bipolarons. The former shows spectral weight up to the Fermi energy, as expected for a metal. The latter has a gap in its spectral weight, set by the bipolaron binding energy, although this is also a (strongly correlated) metal. This difference suggests that angle-resolved photoemission spectroscopy could be used to identify liquids of pre-formed pairs. Furthermore, we show that the one-dimensional liquid of incoherent bipolarons is well approximated by a“Bose sea” of bosons that are hard-core in momentum space, occupying the momenta inside the Fermi sea but otherwise noninteracting. This new proposal for a strongly correlated many-body wave function opens the way for studying various other properties of incoherent (nonsuperconducting) liquids of preformed pairs in any dimension. condensed matter physics strongly correlated electrons fizika kondenzirane snovi močno korelirani elektroni true false true Angleški jezik Slovenski jezik Članek v reviji 2025-03-05 15:46:52 2025-03-05 15:46:53 2025-03-06 04:01:05 0000-00-00 00:00:00 2025 0 0 Str. 096502-1-096502-8 iss. 9 Vol. 134 2025 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 538.9 0031-9007 10.1103/PhysRevLett.134.096502 228038147 ARPES_pre_formed_pairs-11.pdf ARPES_pre_formed_pairs-11.pdf 1 E0652DE1E69BCBF382505394350FA0DE 08dd65626d9bae1a48552d0c17a777b36e65795a9fd8c137f41a4b93be2ba1cc e3f3a4be-f9cf-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=200366 https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.134.096502 0 ed10f714-f9cf-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=200367 Fakulteta za matematiko in fiziko 0 0 0