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Time Dependent Quantum Transport Through Graphene Nanoribbons

Time-dependent quantum transport for graphene nanoribbons (GNR) are calculated by the hierarchical equation of motion (HEOM) method based on the nonequilibrium Green's function (NEGF) theory (Xie et.al, J. Chem. Phys. 137, 044113, 2012). In this paper, a new steady state calculation technique is introduced and accelerated by the contour integration, which is suitable for large systems. Three Lorentzian fitting schemes for the self-energy matrices are developed based on the nonlinear least square method. Within these schemes, the number of Lorentzians is effectively reduced and the fitting results are good and convergent. With these two developments in HEOM, we have calculated the transient currents in GNR. We find a new type of edge state with delta-function-like density of states in many semi-infinite armchair-type GNR.

preprint2013arXivOpen access
Hang XieYanho KwokYu ZhangFeng JiangXiao ZhengYiJing YanGuanhua Chen
cond-mat.mes-hall
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Hang XieYanho KwokYu ZhangFeng JiangXiao ZhengYiJing YanGuanhua Chen

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