20.500.12556/RUL-182577 Fingerprints of preformed pairs in two-electron angle-resolved photoemission spectroscopy We use variational exact diagonalization (VED) to calculate the two-electron removal spectral weight for the Hubbard-Holstein model, starting from the ground state with two electrons on a one-dimensional chain. We argue that this spectral weight provides a valuable proxy for the intensity of 2eARPES processes. Our results show that when contrasted to the presumably larger signal due to two electrons ejected from two different pairs, the presumably weaker signal due to two electrons ejected from the same pair (i) is segregated in energy, appearing at a lower binding energy, and (ii) has a very characteristic momentum dependence, with a different symmetry than that of the signal corresponding to two electrons emitted from two different pairs. We verify that these fingerprints appear for pairs with different symmetries, and prove that they arise as a direct consequence of momentum and energy conservation, therefore they are generic for any model with electron-boson coupling that can lead to formation of electron pairs. Experimental observation of these fingerprints will confirm the existence of pairs. Moreover, the momentum dependence map allows one to distinguish whether the pairs are coherent (superconducting) or not. Finally, we argue that these considerations generalize to finite but low electron concentrations, finite temperatures, and higher dimensions. angle-resolved photoemission spectroscopy bosons polarons Holstein model Hubbard model kontno razločna fotoemisijska spektroskopija bozoni polaroni Holsteinov model Hubbardov model true false true Angleški jezik Slovenski jezik Članek v reviji 2026-05-18 09:04:58 2026-05-18 09:04:59 2026-05-19 04:36:15 0000-00-00 00:00:00 2026 0 0 Str. 196504-1-196504-6 iss. 19 Vol. 136 May 2026 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 538.9 0031-9007 10.1103/4c3d-1bm7 278414083 https://journals.aps.org/prl/abstract/10.1103/4c3d-1bm7 1 9219f9ce-5287-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=233955 2604.18560v1.pdf 2604.18560v1.pdf 1 97F23FFF69C27894631DC3A486FBAB5C 1154db477f36f362ec67b6459be4b3cd6285cbaaecd24a66ecffa1a1c4c46b38 69f75b7d-528a-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=233958 Fakulteta za matematiko in fiziko 0 0 0