Work

Manipulating quantum materials with quantum light

Year: 2019

Type: article

Abstract: We show that the macroscopic magnetic and electronic properties of strongly correlated electron systems can be manipulated by coupling them to a cavity mode. As a paradigmatic example we consider the Fermi-Hubbard model and find that the electron-cavity coupling enhances the magnetic interaction between the electron spins in the ground-state manifold. At half filling this effect can be observed by a change in the magnetic susceptibility. At less than half filling, the cavity introduces a next-nearest-neighbor hopping and mediates a long-range electron-electron interaction between distant sites. We study the ground-state properties with tensor network methods and find that the cavity coupling can induce a phase characterized by a momentum-space pairing effect for electrons.

Source: Physical review. B./Physical review. B

DOI: 10.1103/physrevb.99.085116

Authors: Martin Kiffner, Jonathan R. Coulthard, Frank Schlawin, Arzhang Ardavan, Dieter Jaksch

Institutions: Centre for Quantum Technologies, National University of Singapore, University of Oxford

Language: English

Topic: Cold Atom Physics and Bose-Einstein Condensates

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Research Foundation Singapore, Ministry of Education - Singapore, Engineering and Physical Sciences Research Council, European Research Council

Awards: G4963570608, G8337956030, G8960705998