Fingerprints of preformed pairs in two-electron angle-resolved photoemission spectroscopy

Bonča, Janez (avtor), Damascelli, Andrea (avtor), Berciu, Mona (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: angle-resolved photoemission spectroscopy, bosons, polarons, Holstein model, Hubbard model
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Recenzirani rokopis
• Leto izida: 2026
• Št. strani: Str. 196504-1-196504-6
• Številčenje: Vol. 136, iss. 19
• PID: 20.500.12556/RUL-182577
• UDK: 538.9
• ISSN pri članku: 0031-9007
• DOI: 10.1103/4c3d-1bm7
• COBISS.SI-ID: 278414083
• Datum objave v RUL: 18.05.2026

Gradivo je del revije

• Naslov: Physical review letters
• Skrajšan naslov: Phys. rev. lett.
• Založnik: American Physical Society
• ISSN: 0031-9007
• COBISS.SI-ID: 1282575

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: kontno razločna fotoemisijska spektroskopija, bozoni, polaroni, Holsteinov model, Hubbardov model

Projekti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P1-0044
• Naslov: Teorija trdnih snovi in statistična fizika

• Financer: Drugi - Drug financer ali več financerjev
• Program financ.: Univerza v Ljubljani
• Številka projekta: SN-ZRD/22-27/510
• Naslov: Kvantne tehnologije za transport in komunikacije v 21. stoletju
• Akronim: KTTK21