Boundary-induced violation of the Dirac fermion parity and its signatures in local and global tunneling spectra of graphene

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dc.creatorTkachov, Grigory
dc.creatorHentschel, Martina
dc.date2008-10-03
dc.date2009-05-04
dc.date.accessioned2026-07-07T13:17:24Z
dc.date.available2026-07-07T13:17:24Z
dc.descriptionExtended defects in graphene, such as linear edges, break the translational invariance and can also have an impact on the symmetries specific to massless Dirac-like quasiparticles in this material. The paper examines the consequences of a broken Dirac fermion parity in the framework of the effective boundary conditions varying from the Berry-Mondragon mass confinement to a zigzag edge. The parity breaking reflects the structural sublattice asymmetry of zigzag-type edges and is closely related to the previously predicted time-reversal symmetric edge states. We calculate the local and global densities of the edge states and show that they carry a specific polarization, resembling, to some extent, that of spin-polarized materials. The lack of the parity leads to a nonanalytical particle-hole asymmetry in the edge-state properties. We use our findings to interpret recently observed tunneling spectra in zigzag-terminated graphene. We also propose a graphene-based tunneling device where the particle-hole asymmetric edge states result in a strongly nonlinear conductance-voltage characteristics, which could be used to manipulate the tunneling transport.
dc.description8 pages, 5 figures, to be published in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/0810.0632
dc.identifierhttp://arxiv.org/abs/0810.0632
dc.identifierPhys. Rev. B 79, 195422 (2009)
dc.identifierdoi:10.1103/PhysRevB.79.195422
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/231100
dc.subjectMesoscale and Nanoscale Physics
dc.titleBoundary-induced violation of the Dirac fermion parity and its signatures in local and global tunneling spectra of graphene
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