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SUMMARY:Competing orders in rhombohedral N-layer graphene
DTSTART;VALUE=DATE-TIME:20260924T130000Z
DTEND;VALUE=DATE-TIME:20260924T132000Z
DTSTAMP;VALUE=DATE-TIME:20260914T052844Z
UID:indico-contribution-534@indico.bitp.kiev.ua
DESCRIPTION:Speakers: Sergei Sharapov (Bogolyubov Institute for Theoretica
 l Physics of the National Academy of Sciences of Ukraine)\nWe investigate 
 the emergence of correlated electron phases in rhombohedral $N$-layer grap
 hene due to two-valley Coulomb interactions within a low-energy $k \\cdot 
 p$ framework. Analytical expressions for Lindhard susceptibilities in intr
 a- and intervalley channels are derived\, and the critical temperatures fo
 r phase transitions are estimated using both the random phase approximatio
 n (RPA) and the parquet approximation (PA). Within RPA\, only Stoner and i
 ntervalley coherent (IVC) phases are supported\, while the PA reveals a ri
 cher phase structure including particle-particle (PP) channel instabilitie
 s. Magnetoelectric control of orbital magnetic order in crystalline rhombo
 hedral hexalayer graphene (R6G) is achieved without introducing a moire su
 perlattice. A hallmark of this magnetic order\, which implies time-reversa
 l symmetry breaking\, is a finite Hall conductance at zero magnetic field.
  We observe a non-volatile and hysteretic anomalous Hall effect that can b
 e electrically toggled by sweeping either the carrier density or the displ
 acement field.\nA model describing this behavior is proposed.\n\nA. Herasy
 mchuk\, S.G. Sharapov\, O.V. Yazyev\, Y. Zhumagulov\, Phys. Rev. B  113\, 
 035132 (2026)\n\nhttps://indico.bitp.kiev.ua/event/18/contributions/534/
LOCATION:Bogolyubov Institute for Theoretical Physics Conference Hall
URL:https://indico.bitp.kiev.ua/event/18/contributions/534/
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