Theory of a continuous bandwidth-tuned Wigner-Mott transition

Musser, Seth; Senthil, T.; Chowdhury, Debanjan

doi:10.1103/physrevb.106.155145

Theory of a continuous bandwidth-tuned Wigner-Mott transition

Journal Article · Mon Oct 24 00:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.106.155145· OSTI ID:2419834

^[1]; Senthil, T. ^[2]; ^[3]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); OSTI
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Cornell Univ., Ithaca, NY (United States)

Here we develop a theory for a continuous bandwidth-tuned transition at fixed fractional electron filling from a metal with a generic Fermi surface to a “Wigner-Mott” insulator that spontaneously breaks crystalline space-group symmetries. Across the quantum critical point, (i) the entire electronic Fermi surface disappears abruptly upon approaching from the metallic side, and (ii) the insulating charge gap and various order parameters associated with the spontaneously broken space-group symmetries vanish continuously upon approaching from the insulating side. Additionally, the insulating side hosts a Fermi surface of neutral spinons. We present a framework for describing such continuous metal-insulator transitions (MITs) and analyze the example of a bandwidth-tuned transition at a filling, $$v$$=1/6, for spinful electrons on the triangular lattice. By extending the theory to a certain large-$$N$$ limit, we provide a concrete example of such a continuous MIT and discuss numerous experimental signatures near the critical point. We place our results in the context of recent experiments in moiré transition metal dichalcogenide materials.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0008739

OSTI ID:: 2419834

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 15 Vol. 106; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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