Xu Jie (徐婕)a, Shangguan W. Z.b, Zhan Shi-Chang (詹士昌)a
a Department of Physics, Institute of Microfluidic Chip, Hangzhou Teacher's College, Hangzhou 310012, China; b School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798
Abstract The effect of phase-breaking process on the ac response of a coupled double quantum dot is studied in this paper based on the nonequilibrium Green function formalism. A general expression is derived for the ac current in the presence of electron--phonon interaction. The ac conductance is numerically computed and the results are compared with those in [Anatram M P and Datta S 1995 Phys. Rev. B 51 7632]. Our results reveal that the inter-dot electron tunnelling interplays with that between dots and electron reservoirs, and contributes prominently to the ac current when inter-dot tunnelling coupling is much larger than the tunnelling coupling between dots and electron reservoirs. In addition, the phase-breaking process is found to have a significant effect on the ac transport through the coupled double dot.
Received: 29 March 2005
Revised: 01 June 2005
Accepted manuscript online:
PACS:
72.10.Di
(Scattering by phonons, magnons, and other nonlocalized excitations)
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