Kavli Affiliate: Jie Shan
| First 5 Authors: Jinghao Deng, Jinghao Deng, , ,
| Summary:
Rhombohedral multilayer graphene has emerged as a promising platform for
exploring correlated and topological quantum phases, enabled by its
Berry-curvature-bearing flat bands. While prior work has focused on separated
conduction and valence bands, we probe the extensive semimetallic regime of
rhombohedral hexalayer graphene. We survey a rich phase diagram dominated by
flavor-symmetry breaking and reveal an electric-field-driven band inversion
through fermiology. Near this inversion, we find a superconducting-like state
confined to a region with emergent electron and hole Fermi surfaces. In
addition, two multiferroic orbital-magnetic phases are observed: a ferrovalley
state near zero field and a ferroelectric state at large fields around charge
neutrality. The latter shows electric-field-reversible magnetic hysteresis,
consistent with a $Delta P cdot M$ multiferroic order parameter. Our
fermiology analysis elucidates the correlated semimetal regime in rhombohedral
graphene and underscores its potential to host diverse quantum phases.
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