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- W2574433230 abstract "We devote this work to the study of the mean-field phase diagram of the $nu=0$ quantum Hall state in bilayer graphene and the computation of the corresponding neutral collective modes, extending the results of recent works in the literature. Specifically, we provide a detailed classification of the complete orbital-valley-spin structure of the collective modes and show that phase transitions are characterized by singlet modes in orbital pseudospin, which are independent of the Coulomb strength and suffer strong many-body corrections from short-range interactions at low momentum. We describe the symmetry breaking mechanism for phase transitions in terms of the valley-spin structure of the Goldstone modes. For the remaining phase boundaries, we prove that the associated exact $SO(5)$ symmetry existing at zero Zeeman energy and interlayer voltage survives as a weaker mean-field symmetry of the Hartree-Fock equations. We extend the previous results for bilayer graphene to the monolayer scenario. Finally, we show that taking into account Landau level mixing through screening does not modify the physical picture explained above." @default.
- W2574433230 created "2017-01-26" @default.
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- W2574433230 date "2017-04-18" @default.
- W2574433230 modified "2023-10-17" @default.
- W2574433230 title "Symmetry characterization of the collective modes of the phase diagram of the ν=0 quantum Hall state in graphene: Mean-field phase diagram and spontaneously broken symmetries" @default.
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- W2574433230 doi "https://doi.org/10.1103/physrevb.95.165427" @default.
- W2574433230 hasPublicationYear "2017" @default.
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