{
  "id": "2206.10631",
  "version": "v1",
  "published": "2022-06-21T18:00:01.000Z",
  "updated": "2022-06-21T18:00:01.000Z",
  "title": "Tunable spin and valley excitations of correlated insulators in $Γ$-valley moiré bands",
  "authors": [
    "Benjamin A. Foutty",
    "Jiachen Yu",
    "Trithep Devakul",
    "Carlos R. Kometter",
    "Yang Zhang",
    "Kenji Watanabe",
    "Takashi Taniguchi",
    "Liang Fu",
    "Benjamin E. Feldman"
  ],
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.str-el"
  ],
  "abstract": "Moir\\'e superlattices formed from transition metal dichalcogenides (TMDs) have been shown to support a variety of quantum electronic phases that are highly tunable using applied electromagnetic fields. While the valley character of the low-energy states dramatically affects optoelectronic properties in the constituent TMDs, this degree of freedom has yet to be fully explored in moir\\'e systems. Here, we establish twisted double bilayer WSe$_2$ as an experimental platform to study electronic correlations within $\\Gamma$-valley moir\\'e bands. Through a combination of local and global electronic compressibility measurements, we identify charge-ordered phases at multiple integer and fractional moir\\'e band fillings $\\nu$. By measuring the magnetic field dependence of their energy gaps and the chemical potential upon doping, we reveal spin-polarized ground states with novel spin polaron quasiparticle excitations. In addition, an applied displacement field allows us to realize a new mechanism of metal-insulator transition at $\\nu = -1$ driven by tuning between $\\Gamma$- and $K$-valley moir\\'e bands. Together, our results demonstrate control over both the spin and valley character of the correlated ground and excited states in this system.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-06-21T18:00:01.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "valley excitations",
      "states dramatically affects optoelectronic",
      "dramatically affects optoelectronic properties",
      "tunable spin",
      "correlated insulators"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}