Quantum phase transition and Coulomb blockade effect in triangular quantum dots with interdot capacitive and tunnel couplings

doi:10.1088/1674-1056/24/2/027501

Abstract The quantum phase transition and the electronic transport in a triangular quantum dot system are investigated using the numerical renormalization group method. We concentrate on the interplay between the interdot capacitive coupling V and the interdot tunnel coupling t. For small t, three dots form a local spin doublet. As t increases, due to the competition between V and t, there exist two first-order transitions with phase sequence spin-doublet-magnetic frustration phase-orbital spin singlet. When t is absent, the evolutions of the total charge on the dots and the linear conductance are of the typical Coulomb-blockade features with increasing gate voltage. While for sufficient t, the antiferromagnetic spin correlation between dots is enhanced, and the conductance is strongly suppressed for the bonding state is almost doubly occupied.

Keywords: quantum phase transition Coulomb blockade effect triangular quantum dots strongly correlated system

Received: 16 August 2014
Revised: 26 September 2014
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. 10874132 and 11174228) and the Doctoral Scientific Research Foundation of HUAT (Grant No. BK201407). One of the authors (Huang Hai-Ming) supported by the Scientific Research Items Foundation of Educational Committee of Hubei Province, China (Grant No. Q20131805).

Corresponding Authors: Xiong Yong-Chen
E-mail: xiongyc_lx@huat.edu.cn

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Xiong Yong-Chen (熊永臣), Wang Wei-Zhong (王为忠), Yang Jun-Tao (杨俊涛), Huang Hai-Ming (黄海铭) Quantum phase transition and Coulomb blockade effect in triangular quantum dots with interdot capacitive and tunnel couplings 2015 Chin. Phys. B 24 027501

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Quantum phase transition and Coulomb blockade effect in triangular quantum dots with interdot capacitive and tunnel couplings

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