Whereas massless Dirac fermions in monolayer graphene exhibit Klein tunneling when passing throug... more Whereas massless Dirac fermions in monolayer graphene exhibit Klein tunneling when passing through a potential barrier upon normal incidence, such a barrier totally reflects massive Dirac fermions in bilayer graphene due to difference in chirality. We show that, in the presence of magnetic barriers, such massive Dirac fermions can have transmission through even at normal incidence. The general consequence of this behaviour for multilayer graphene consisting of massless and massive modes are mentioned. We also briefly discuss the effect of a bias voltage on such magnetotransport.
In the absence of a magnetic field, scattered wavefunction inside a circular p-n junction in grap... more In the absence of a magnetic field, scattered wavefunction inside a circular p-n junction in graphene exhibits an interference pattern with high intensity maximum located around the caustics. We investigate the wavefunctions in the presence of a uniform magnetic field outside the circular region to show how the loci of the high intensity region changes by forming Landau level structure outside the circular region and a central high intensity region inside the circular p-n junction due to the strong reflection of massless Dirac fermions by the outside magnetic field. We conclude by suggesting experimental ways to detect such change of pattern due to the effect of the magnetic field.
Journal of physics. Condensed matter : an Institute of Physics journal, Jan 16, 2014
In the absence of a magnetic field, a scattered wavefunction inside a circular p-n junction in gr... more In the absence of a magnetic field, a scattered wavefunction inside a circular p-n junction in graphene exhibits an interference pattern with its high intensity maximum located around the caustics. We investigate the wavefunctions in the presence of a uniform magnetic field outside the circular region to show how the loci of the high intensity region changes by forming a Landau-level structure outside the circular region and a central high intensity region inside the circular p-n junction due to the strong reflection of massless Dirac fermions by the outside magnetic field. We conclude by suggesting experimental ways to detect such changes in pattern due to the effect of the magnetic field.
Whereas massless Dirac fermions in monolayer graphene exhibit Klein tunneling when passing throug... more Whereas massless Dirac fermions in monolayer graphene exhibit Klein tunneling when passing through a potential barrier upon normal incidence, such a barrier totally reflects massive Dirac fermions in bilayer graphene due to difference in chirality. We show that, in the presence of magnetic barriers, such massive Dirac fermions can have transmission through even at normal incidence. The general consequence of this behaviour for multilayer graphene consisting of massless and massive modes are mentioned. We also briefly discuss the effect of a bias voltage on such magnetotransport.
In the absence of a magnetic field, scattered wavefunction inside a circular p-n junction in grap... more In the absence of a magnetic field, scattered wavefunction inside a circular p-n junction in graphene exhibits an interference pattern with high intensity maximum located around the caustics. We investigate the wavefunctions in the presence of a uniform magnetic field outside the circular region to show how the loci of the high intensity region changes by forming Landau level structure outside the circular region and a central high intensity region inside the circular p-n junction due to the strong reflection of massless Dirac fermions by the outside magnetic field. We conclude by suggesting experimental ways to detect such change of pattern due to the effect of the magnetic field.
Journal of physics. Condensed matter : an Institute of Physics journal, Jan 16, 2014
In the absence of a magnetic field, a scattered wavefunction inside a circular p-n junction in gr... more In the absence of a magnetic field, a scattered wavefunction inside a circular p-n junction in graphene exhibits an interference pattern with its high intensity maximum located around the caustics. We investigate the wavefunctions in the presence of a uniform magnetic field outside the circular region to show how the loci of the high intensity region changes by forming a Landau-level structure outside the circular region and a central high intensity region inside the circular p-n junction due to the strong reflection of massless Dirac fermions by the outside magnetic field. We conclude by suggesting experimental ways to detect such changes in pattern due to the effect of the magnetic field.
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Papers by Neetu Garg