Landau level splittings, phase transitions, and nonuniform charge distribution in trilayer graphene
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Universidade Federal de Minas Gerais
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We report on magneto-transport studies of dual-gated, Bernal-stacked trilayer graphene (TLG)
encapsulated in boron nitride crystals. We observe a quantum Hall effect staircase which indicates
a complete lifting of the twelve-fold degeneracy of the zeroth Landau level. As a function of perpendicular electric field, our data exhibits a sequence of phase transitions between all integer quantum Hall states in the filling factor interval −8 < ν < 0. We develop a theoretical model and argue that, in contrast to monolayer and bilayer graphene, the observed Landau level splittings and quantum
Hall phase transitions can be understood within a single-particle picture, but imply the presence of
a charge density imbalance between the inner and outer layers of TLG, even at charge neutrality
and zero transverse electric field. Our results indicate the importance of a previously unaccounted
band structure parameter which, together with a more accurate estimate of the other tight-binding
parameters, results in a significantly improved determination of the electronic and Landau level
structure of TLG.
Abstract
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Efeito quântico de Hall, Estrutura eletrônica, Fenômenos mesoscópicos
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Quantum hall effect, Trilayer graphene, Landau level splittings, Electronic structure, Magnetotransport, Mesoscopics
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https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.117.066601