Magnetic ground states of honeycomb lattice Wigner crystals

Nitin Kaushal; Nicolás Morales-Durán; Allan H. MacDonald; Elbio Dagotto

doi:10.1038/s42005-022-01065-0

Magnetic ground states of honeycomb lattice Wigner crystals

Nitin Kaushal, Nicolás Morales-Durán, Allan H. MacDonald, Elbio Dagotto

Computational Chemistry and Nanomaterial

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Lattice Wigner crystal states stabilized by long-range Coulomb interactions have recently been realized in two-dimensional moiré materials. We employ large-scale unrestricted Hartree-Fock techniques to unveil the magnetic phase diagrams of honeycomb lattice Wigner crystals. For the three lattice filling factors with the largest charge gaps, n= 2 / 3 , 1 / 2 , 1 / 3 , the magnetic phase diagrams contain multiple phases, including ones with non-collinear and non-coplanar spin arrangements. We discuss magnetization evolution with external magnetic field, which has potential as an experimental signature of exotic spin states. Our theoretical results could potentially be validated in moiré materials formed from group VI transition metal dichalcogenide twisted homobilayers.

Original language	English
Article number	289
Journal	Communications Physics
Volume	5
Issue number	1
DOIs	https://doi.org/10.1038/s42005-022-01065-0
State	Published - Dec 2022

Funding

N.K. and E.D. were supported by the US Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Materials Science and Engineering Division. N.M.D. and A.H.M. were supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award No. DE-SC0022106.

Funders	Funder number
U.S. Department of Energy	DE-SC0022106
Office of Science
Basic Energy Sciences
Division of Materials Sciences and Engineering

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title = "Magnetic ground states of honeycomb lattice Wigner crystals",

abstract = "Lattice Wigner crystal states stabilized by long-range Coulomb interactions have recently been realized in two-dimensional moir{\'e} materials. We employ large-scale unrestricted Hartree-Fock techniques to unveil the magnetic phase diagrams of honeycomb lattice Wigner crystals. For the three lattice filling factors with the largest charge gaps, n= 2 / 3 , 1 / 2 , 1 / 3 , the magnetic phase diagrams contain multiple phases, including ones with non-collinear and non-coplanar spin arrangements. We discuss magnetization evolution with external magnetic field, which has potential as an experimental signature of exotic spin states. Our theoretical results could potentially be validated in moir{\'e} materials formed from group VI transition metal dichalcogenide twisted homobilayers.",

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AU - Kaushal, Nitin

AU - Morales-Durán, Nicolás

AU - MacDonald, Allan H.

AU - Dagotto, Elbio

PY - 2022/12

Y1 - 2022/12

N2 - Lattice Wigner crystal states stabilized by long-range Coulomb interactions have recently been realized in two-dimensional moiré materials. We employ large-scale unrestricted Hartree-Fock techniques to unveil the magnetic phase diagrams of honeycomb lattice Wigner crystals. For the three lattice filling factors with the largest charge gaps, n= 2 / 3 , 1 / 2 , 1 / 3 , the magnetic phase diagrams contain multiple phases, including ones with non-collinear and non-coplanar spin arrangements. We discuss magnetization evolution with external magnetic field, which has potential as an experimental signature of exotic spin states. Our theoretical results could potentially be validated in moiré materials formed from group VI transition metal dichalcogenide twisted homobilayers.

AB - Lattice Wigner crystal states stabilized by long-range Coulomb interactions have recently been realized in two-dimensional moiré materials. We employ large-scale unrestricted Hartree-Fock techniques to unveil the magnetic phase diagrams of honeycomb lattice Wigner crystals. For the three lattice filling factors with the largest charge gaps, n= 2 / 3 , 1 / 2 , 1 / 3 , the magnetic phase diagrams contain multiple phases, including ones with non-collinear and non-coplanar spin arrangements. We discuss magnetization evolution with external magnetic field, which has potential as an experimental signature of exotic spin states. Our theoretical results could potentially be validated in moiré materials formed from group VI transition metal dichalcogenide twisted homobilayers.

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Magnetic ground states of honeycomb lattice Wigner crystals

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