Magnetism and quantum melting in moiré-material Wigner crystals

Morales-Durán, Nicolás; Potasz, Pawel; MacDonald, Allan H.

doi:10.1103/physrevb.107.235131

Magnetism and quantum melting in moiré-material Wigner crystals

Journal Article · Wed Jun 14 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.107.235131· OSTI ID:1968279

^[1]; Potasz, Pawel ^[2]; MacDonald, Allan H. ^[3]

Univ. of Texas, Austin, TX (United States); University of Texas at Austin
Nicolaus Copernicus Univ., Torun (Poland). Inst. of Physics
Univ. of Texas, Austin, TX (United States)

Recent experiments have established that semiconductor-based moir´e materials can host incompressible states at a series of fractional moir´e-miniband fillings. These states have been identified as generalized Wigner crystals in which electrons localize on a subset of the available triangular-lattice moir´e superlattice sites. In this article, we use momentum-space exact diagonalization to investigate the many-body ground state evolution at rational fillings from the weak-hopping classical lattice gas limit, in which only spin degrees-of-freedom are active at low energies, to the strong-hopping metallic regime where the Wigner crystals melt. We specifically address the nature of the magnetic ground states of the generalized Wigner crystals at fillings ν = 1/3 and ν = 2/3.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0022106

OSTI ID:: 1968279

Alternate ID(s):: OSTI ID: 2437712
OSTI ID: 1985195

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 23 Vol. 107; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Magnetism and quantum melting in moiré-material Wigner crystals

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