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  Quantum Hall ferroelectric helix in bilayer graphene

Jolicoeur, T., Töke, C., & Sodemann, I. (2019). Quantum Hall ferroelectric helix in bilayer graphene. Physical Review B, 99(11): 115139. doi:10.1103/PhysRevB.99.115139.

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Jolicoeur, Thierry1, Author
Töke, Csaba1, Author
Sodemann, Inti2, Author           
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1external, ou_persistent22              
2Max Planck Institute for the Physics of Complex Systems, Max Planck Society, ou_2117288              

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 MPIPKS: Ultracold matter
 Abstract: We reexamine the nature of the ground states of bilayer graphene at odd integer filling factors within a simplified model of nearly degenerate n = 0 and n = 1 Landau levels. Previous Hartree-Fock studies have found that ferroelectric states with orbital coherence can be stabilized by tuning the orbital splitting between these levels. These studies indicated that, in addition to a uniform ferroelectric state, a helical ferroelectric phase with spontaneously broken translational symmetry is possible. By performing exact diagonalization on the torus, we argue that the system does not have a uniform coherent state but instead transitions directly from the uniform incoherent state into the ferroelectric helical phase. We argue that there is a realistic prospect to stabilize the helical ferroelectric state in bilayer graphene by tuning the interlayer electric field in a model that includes all single-particle corrections to its zero energy eightfold multiplet of Landau levels.

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 Dates: 2019-03-292019-03-15
 Publication Status: Issued
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 99 (11) Sequence Number: 115139 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008