TY - JOUR
T1 - Effect of geometrical rotation on conductance fluctuations in graphene quantum dots
AU - Ying, Lei
AU - Huang, Liang
AU - Lai, Ying-Cheng
AU - Zhang, Yan
PY - 2013/3/13
Y1 - 2013/3/13
N2 - Conductance fluctuations are ubiquitous in quantum transport through nanoscale devices, and how to modulate or control the fluctuation patterns is of considerable interest. We use two-terminal graphene devices as a prototypical system and articulate a scheme based on geometrical rotation of the device to effectively modulate the conductance fluctuations. To facilitate a systematic calculation of the conductance as a function of the Fermi energy and the rotation angle, we use a layer-by-layer based, recursive non-equilibrium Green's function approach, which is demonstrated to be computationally extremely efficient. Our study indicates that relative rotation of the device, which is experimentally feasible, can markedly affect the degree of conductance fluctuations, and we provide physical explanations of this behavior based on the emergence of edge states.
AB - Conductance fluctuations are ubiquitous in quantum transport through nanoscale devices, and how to modulate or control the fluctuation patterns is of considerable interest. We use two-terminal graphene devices as a prototypical system and articulate a scheme based on geometrical rotation of the device to effectively modulate the conductance fluctuations. To facilitate a systematic calculation of the conductance as a function of the Fermi energy and the rotation angle, we use a layer-by-layer based, recursive non-equilibrium Green's function approach, which is demonstrated to be computationally extremely efficient. Our study indicates that relative rotation of the device, which is experimentally feasible, can markedly affect the degree of conductance fluctuations, and we provide physical explanations of this behavior based on the emergence of edge states.
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U2 - 10.1088/0953-8984/25/10/105802
DO - 10.1088/0953-8984/25/10/105802
M3 - Article
C2 - 23395833
AN - SCOPUS:84874088205
SN - 0953-8984
VL - 25
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
IS - 10
M1 - 105802
ER -