---
res:
  bibo_abstract:
  - Ferromagnetism is most common in transition metal compounds but may also arise
    in low-density two-dimensional electron systems, with signatures observed in silicon,
    III-V semiconductor systems, and graphene moiré heterostructures. Here we show
    that gate-tuned van Hove singularities in rhombohedral trilayer graphene drive
    the spontaneous ferromagnetic polarization of the electron system into one or
    more spin- and valley flavors. Using capacitance measurements on graphite-gated
    van der Waals heterostructures, we find a cascade of density- and electronic displacement
    field tuned phase transitions marked by negative electronic compressibility. The
    transitions define the boundaries between phases where quantum oscillations have
    either four-fold, two-fold, or one-fold degeneracy, associated with a spin and
    valley degenerate normal metal, spin-polarized `half-metal', and spin and valley
    polarized `quarter metal', respectively. For electron doping, the salient features
    are well captured by a phenomenological Stoner model with a valley-anisotropic
    Hund's coupling, likely arising from interactions at the lattice scale. For hole
    filling, we observe a richer phase diagram featuring a delicate interplay of broken
    symmetries and transitions in the Fermi surface topology. Finally, by rotational
    alignment of a hexagonal boron nitride substrate to induce a moiré superlattice,
    we find that the superlattice perturbs the preexisting isospin order only weakly,
    leaving the basic phase diagram intact while catalyzing the formation of topologically
    nontrivial gapped states whenever itinerant half- or quarter metal states occur
    at half- or quarter superlattice band filling. Our results show that rhombohedral
    trilayer graphene is an ideal platform for well-controlled tests of many-body
    theory and reveal magnetism in moiré materials to be fundamentally itinerant in
    nature.@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Haoxin
      foaf_name: Zhou, Haoxin
      foaf_surname: Zhou
  - foaf_Person:
      foaf_givenName: Tian
      foaf_name: Xie, Tian
      foaf_surname: Xie
  - foaf_Person:
      foaf_givenName: Areg
      foaf_name: Ghazaryan, Areg
      foaf_surname: Ghazaryan
      foaf_workInfoHomepage: http://www.librecat.org/personId=4AF46FD6-F248-11E8-B48F-1D18A9856A87
    orcid: 0000-0001-9666-3543
  - foaf_Person:
      foaf_givenName: Tobias
      foaf_name: Holder, Tobias
      foaf_surname: Holder
  - foaf_Person:
      foaf_givenName: James R.
      foaf_name: Ehrets, James R.
      foaf_surname: Ehrets
  - foaf_Person:
      foaf_givenName: Eric M.
      foaf_name: Spanton, Eric M.
      foaf_surname: Spanton
  - foaf_Person:
      foaf_givenName: Takashi
      foaf_name: Taniguchi, Takashi
      foaf_surname: Taniguchi
  - foaf_Person:
      foaf_givenName: Kenji
      foaf_name: Watanabe, Kenji
      foaf_surname: Watanabe
  - foaf_Person:
      foaf_givenName: Erez
      foaf_name: Berg, Erez
      foaf_surname: Berg
  - foaf_Person:
      foaf_givenName: Maksym
      foaf_name: Serbyn, Maksym
      foaf_surname: Serbyn
      foaf_workInfoHomepage: http://www.librecat.org/personId=47809E7E-F248-11E8-B48F-1D18A9856A87
    orcid: 0000-0002-2399-5827
  - foaf_Person:
      foaf_givenName: Andrea F.
      foaf_name: Young, Andrea F.
      foaf_surname: Young
  bibo_doi: 10.1038/s41586-021-03938-w
  dct_date: 2021^xs_gYear
  dct_identifier:
  - UT:000706977400002
  dct_isPartOf:
  - http://id.crossref.org/issn/0028-0836
  - http://id.crossref.org/issn/1476-4687
  dct_language: eng
  dct_publisher: Springer Nature@
  dct_subject:
  - condensed matter - mesoscale and nanoscale physics
  - condensed matter - strongly correlated electrons
  - multidisciplinary
  dct_title: Half and quarter metals in rhombohedral trilayer graphene@
...