Work

Doped moiré magnets: Renormalized flat bands and excitonic phases

Year: 2024

Type: article

Abstract: We explore the phase diagram of a twisted bilayer of strongly interacting electrons on a honeycomb lattice close to half filling using the slave-boson mean-field theory. Our analysis indicates that a variety of new phases can be realized as a function of chemical doping and twist angle. In particular, we find a nonmagnetic excitonic insulating phase that breaks the translational symmetry of the underlying moir\'e pattern. This phase results from the interplay of strong Coulomb interactions and the twist angle. In addition, we show that the features of the renormalized dispersion, such as the magic angles, depend significantly on the interactions. Our results highlight the rich physics arising in doped moir\'e superlattices of Mott insulators.

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

DOI: 10.1103/physrevb.110.245126

Authors: Ilia Komissarov, Onur Erten, Pouyan Ghaemi

Institutions: Columbia University, Arizona State University, The Graduate Center, CUNY, City College of New York, City University of New York

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, Julian Schwinger Foundation for Physics Research, Office of Science, Basic Energy Sciences

Awards: Strain engineering of exciton-polaritons in 2D Semiconductors, G1918411271, Collaborative Research: Fractional quantum Hall effect on noisy quantum computers