Signature of symmetry of laterally coupled quantum dots in far-infrared spectrum

doi:10.1088/1674-1056/21/2/027301

Abstract We study the effect of structure asymmetry on the energy spectrum and the far-infrared spectrum (FIR) of a lateral coupled quantum dot. The calculated spectrum shows that the parity break of coupled quantum dot results in more coherent superpositions in the low-lying states and exhibits unique anti-crossing in the two-electron FIR spectrum modulated by a magnetic field. We also find that the Coulomb correlation effect can make the FIR spectrum of coupled quantum dot without strict parity deviate greatly from Kohn theorem, which is just contrary to the symmetric case. Our results therefore suggest that FIR spectrum may be used to determine the symmetry of coupled quantum dot and to evaluate the degree of Coulomb interaction.

Keywords: structure symmetry far-infrared spectrum coupled quantum dot Coulomb interaction

Received: 31 March 2011
Revised: 21 June 2011
Accepted manuscript online:

PACS:	73.21.La	(Quantum dots)
	75.75.-c	(Magnetic properties of nanostructures)
	78.40.Fy	(Semiconductors)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11074025), the National Basic Research Program of China (Grant No. 2011CB922200), and a grant from the China Academy of Engineering Physics.

Corresponding Authors: Li Yan-Fang,liyf1230@sohu.com
E-mail: liyf1230@sohu.com

Cite this article:

Gu Li-Ying(谷利英), Li Yan-Fang(李艳芳), Chu Wei-Dong(楚卫东), and Wei Ying-Hui(卫英慧) Signature of symmetry of laterally coupled quantum dots in far-infrared spectrum 2012 Chin. Phys. B 21 027301

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