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Chin. Phys. B, 2008, Vol. 17(6): 2208-2215    DOI: 10.1088/1674-1056/17/6/045

First-principles calculation of transport property in nano-devices under an external magnetic field

Chen Jing-Zhe, Zhang Jin, Han Ru-Shan
School of Physics, Peking University, Beijing 100871, China
Abstract  The mesoscopic quantum interference phenomenon (QIP) can be observed and behaves as the oscillation of conductance in nano-devices when the external magnetic field changes. Excluding the factor of impurities or defects, specific QIP is determined by the sample geometry. We have improved a first-principles method based on the matrix Green's function and the density functional theory to simulate the transport behaviour of such systems under a magnetic field. We have studied two kinds of QIP: universal conductance fluctuation (UCF) and Aharonov--Bohm effect (A--B effect). We find that the amplitude of UCF is much smaller than the previous theoretical prediction. We have discussed the origin of difference and concluded that due to the failure of ergodic hypothesis, the ensemble statistics is not applicable, and the conductance fluctuation is determined by the flux-dependent density of states (DOSs). We have also studied the relation between the UCF and the structure of sample. For a specific structure, an atomic circle, the A--B effect is observed and the origin of the oscillation is also discussed.
Keywords:  quantum interference phenomenon (QIP)      first-principles      universal conductance fluctuation (UFC)     
Received:  08 October 2007      Published:  20 June 2008
PACS:  85.35.-p (Nanoelectronic devices)  
  71.15.Mb (Density functional theory, local density approximation, gradient and other corrections)  
  72.10.-d (Theory of electronic transport; scattering mechanisms)  
  73.23.-b (Electronic transport in mesoscopic systems)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 90207009, 90206048 and 90406014).

Cite this article: 

Chen Jing-Zhe, Zhang Jin, Han Ru-Shan First-principles calculation of transport property in nano-devices under an external magnetic field 2008 Chin. Phys. B 17 2208

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