Year: 2025
Type: article
Abstract: Feshbach resonances play a vital role in the success of cold atoms investigating strongly correlated physics. The recent observation of their solid-state analog in the scattering of holes and intralayer excitons in transition metal dichalcogenides [I. Schwartz et al., Science 374, 336 (2021)SCIEAS0036-807510.1126/science.abj3831] holds compelling promise for bringing fully controllable interactions to the field of semiconductors. Here, we demonstrate how tunneling-induced layer hybridization can lead to the emergence of two distinct classes of Feshbach resonances in atomically thin semiconductors. Based on microscopic scattering theory we show that these two types of Feshbach resonances allow us to tune interactions between electrons and both short-lived intralayer, as well as long-lived interlayer excitons. We predict the exciton-electron scattering phase shift from first principles and show that the exciton-electron coupling is fully tunable from strong to vanishing interactions. The tunability of interactions opens the avenue to explore Bose-Fermi mixtures in solid-state systems in regimes that were previously only accessible in cold atom experiments.
Source: Physical Review Letters
Authors: Marcel Wagner, Rafał Ołdziejewski, Félix Rose, Verena Köder, Clemens Kuhlenkamp, Ataç İmamoğlu, Richard Schmidt
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Awards: Strongly correlated electrons in van der Waals heterostructures: an optical investigation, G4597855739, G6526081583, EXC 2181: STRUKTUREN: Emergenz in Natur, Mathematik und komplexen Daten, SFB 1225: Isolierte Quantensysteme und Universalität unter extremen Bedingungen (ISOQUANT), G903758074, G993971353
OpenAlex ID: W4407840772