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8 papers · 2 filters
Ligand-based transport resonances of single-molecule magnet spin filters: Suppression of the Coulomb blockade and determination of the orientation of the magnetic easy axis
Fatemeh Rostamzadeh Renani, George Kirczenow
We investigate single molecule magnet transistors (SMMTs) with ligands that support transport resonances. We find the lowest unoccupied molecular orbitals of Mn12-benzoate SMMs (wi…
Magnetic field induced inequivalent vortex zero modes in strained graphene
Bitan Roy
Zero energy states in the Dirac spectrum with U(1) symmetric massive vortices of various underlying insulating orders in strained graphene are constructed in the presence of the ma…
Isospin of topological defects in Dirac systems
Igor F. Herbut
We study the Dirac quasiparticles in -dimensional lattice systems of electrons in the presence of domain walls (), vortices (), or hedgehogs () of superconducting…
Time reversal, fermion doubling, and the masses of lattice Dirac fermions in three dimensions
Igor F. Herbut
Motivated by recent examples of three-dimensional lattice Hamiltonians with massless Dirac fermions in their (bulk) spectrum, I revisit the problem of fermion doubling on bipartite…
Nonlinear conductance quantization in graphene ribbons
S. Ihnatsenka, G. Kirczenow
We present numerical studies of non-linear conduction in graphene nanoribbons when a bias potential is applied between the source and drain electrodes. We find that the conductance…
Supersymmetric Runge-Lenz-Pauli vector for Dirac vortex in topological insulators and graphene
Chi-Ken Lu, Igor F. Herbut
The Dirac mass-vortex at the surface of a topological insulator or in graphene is considered. Within the linear approximation for the vortex amplitude's radial dependence, the spec…