Eur. Phys. J. B 72, 497-502 (2009)
https://doi.org/10.1140/epjb/e2009-00379-8

Exact electronic transport in an alternating A/B quantum dot array

¹ School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, P.R. China
² State Key Lab of Optical Technologies for Microfabrication, Institute of Optics & Electronics, Chinese Academy of Sciences, Chengdu, 610209, P.R. China

Corresponding author: ^a phytbh@163.com

Received: 14 July 2009
Revised: 12 September 2009
Published online: 7 November 2009

Abstract

The electronic transport in the quantum dot array for an arbitrary number of dots in which the quantum dot A is alternated with the quantum dot B is studied with the exact Green's function calculation. The algebraic structures of the DC current, the differential conductance, and the density of states for the alternating A/B quantum dot array are obtained analytically. The results show that the two-step-like DC current, the two-main-peak-like differential conductance, and the multi-peak-like density of states will be sensitively modified by the number of dots and the difference for the one-electron level and the resonant width of the quantum dot A with ones of the quantum dot B.