Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 35: Graphene: Transport (TT, jointly with HL, MA, O)

HL 35.5: Talk

Tuesday, March 12, 2013, 10:30–10:45, H17

Efficient quantum transport simulation for bulk graphene heterojunctions: Klein backscattering revisited — •Ming-Hao Liu and Klaus Richter — Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany

The quantum transport formalism based on tight-binding models is known to be powerful in dealing with a wide range of open physical systems subject to external driving forces but is, at the same time, limited by the memory requirement’s increasing with the number of atomic sites in the scattering region. Here we demonstrate how to achieve an accurate simulation of quantum transport feasible for experimentally sized bulk graphene heterojunctions at a strongly reduced computational cost [1]. Without free tuning parameters, we show excellent agreement with recent experiments on Klein backscattering [2,3].
[1] M.-H. Liu and K. Richter, Phys. Rev. B 86, 115455 (2012).

[2] A. F. Young and P. Kim, Nat. Phys. 5, 222 (2009).

[3] S.-G. Nam, D.-K. Ki, J. W. Park, Y. Kim, J. S. Kim, and H.-J. Lee, Nanotechnology 22, 415203 (2011).