Charge oscillation and many-body effect in triangular quantum dots

doi:10.1088/1674-1056/21/11/117501

Abstract We study the charge oscillation in the triangular quantum dots symmetrically coupled to the leads. A strong charge oscillation is observed even for a very small level difference. We attribute this oscillation behavior to the many-body effect in the strongly correlated system instead of the physical scenarios based on the mean-field approach in the previous works for the two-level dot. The level difference induces the difference of the occupations between different dots, while the symmetry of the many-body states favors the homogeneous distribution of the charge density on the three dots. The interplay of these two factors results in the charge oscillation.

Keywords: charge oscillation many-body effect triangular quantum dots

Received: 01 April 2012
Revised: 18 May 2012
Accepted manuscript online:

PACS:	75.20.Hr	(Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions)
	73.63.-b	(Electronic transport in nanoscale materials and structures)
	73.23.-b	(Electronic transport in mesoscopic systems)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11174228 and 10874132).

Corresponding Authors: Wang Wei-Zhong
E-mail: wzwang@whu.edu.cn

Cite this article:

Xiong Yong-Chen (熊永臣), Wang Wei-Zhong (王为忠 ) Charge oscillation and many-body effect in triangular quantum dots 2012 Chin. Phys. B 21 117501

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