# The interplay of field-tunable strongly correlated states in a multi-orbital moiré system

https://mdr.nims.go.jp/datasets/cbfff213-08d0-48e9-b34b-acb8e8051b30

## File

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## Id

cbfff213-08d0-48e9-b34b-acb8e8051b30

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-18T08:26:58.399607Z

## Updated at

2025-02-23T13:48:53.631367Z

## Published at

2025-02-23T13:48:53.704767Z

## Doi



## First published url

https://doi.org/10.1038/s41567-024-02385-4

## Date published

2024-01-30

## Recorded date published

2024-4

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: The interplay of field-tunable strongly correlated states in a multi-orbital
    moiré system
  title_type: original
  lang: en

## Description

- description: The interplay of charge, spin, lattice, and orbital degrees of freedom
    leads to a wide range of emergent phenomena in strongly correlated systems. In
    heterobilayer transition metal dichalcogenide moiré systems, recent observations
    of Mott insulators and generalized Wigner crystals are well described by triangular
    lattice single-orbital Hubbard models based on K-valley derived moiré bands. Richer
    phase diagrams, mapped onto multi-orbital Hubbard models, are possible with hexagonal
    lattices in Γ-valley derived moiré bands and additional layer degrees of freedom.
    Here we report the tunable interaction between strongly correlated hole states
    hosted by Γ- and K-derived moiré bands in a monolayer MoSe2 / natural WSe2 bilayer
    device. To precisely probe the nature of the correlated states, we optically characterise
    the behaviour of exciton-polarons and distinguish the layer and valley degrees
    of freedom. We find that the honeycomb Γ-band gives rise to a charge- transfer
    insulator described by a two-orbital Hubbard model with inequivalent ΓA and ΓB
    orbitals. With an out-of-plane electric field, we re-order the ΓB- and K-derived
    bands energetically, driving an abrupt redistribution of carriers to the layer-polarized
    K orbital where new correlated states are observed. Finally, by fine-tuning the
    band-alignment, we obtain degeneracy of the ΓB and K orbitals at the Fermi level.
    In this critical condition, stable Wigner crystals with carriers distributed across
    the two orbitals are observed until the Fermi-level reaches one hole per lattice
    site, whereupon the system collapses into a filled ΓB orbital. Our results establish
    a platform to investigate the interplay of charge, spin, lattice, and layer geometry
    in multi-orbital Hubbard model Hamiltonians.
  description_type: abstract
  lang: und

## Creator

- name: Aidan J. Campbell
  role: author
- name: Valerio Vitale
  role: author
- name: Mauro Brotons-Gisbert
  role: author
- name: Hyeonjun Baek
  role: author
- name: Antoine Borel
  role: author
- name: Tatyana V. Ivanova
  role: author
- name: Takashi Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Kenji Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Johannes Lischner
  role: author
- name: Brian D. Gerardot
  role: author

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: Strongly correlated systems
  schema: not_defined
- subject: transition-metal-dichalcogenide
  schema: not_defined
- subject: Hubbard models
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Nature Physics
  issn: '17452481'
  volume: '20'
  issue: '4'
  start_page: 589
  end_page: 596

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## Fileset

- id: 5dda96af-c19a-476f-8463-8e8bf65205c4
  filename: s41567-024-02385-4.pdf
  content_type: application/pdf
  size: 5409787
  md5: f9b2889e7d3fab5b5b9c1830ad09b6d5

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filename: s41567-024-02385-4.pdf