Quantum Phase Transition and Ferromagnetic Spin Correlation in Parallel Double Quantum Dots

2007 ◽  
Vol 24 (10) ◽  
pp. 2926-2929 ◽  
Author(s):  
Ding Guo-Hui ◽  
Ye Fei
Keyword(s):  
Phase Transition ◽  
Quantum Dots ◽  
Quantum Phase Transition ◽  
Spin Correlation ◽  
Quantum Phase ◽  
Double Quantum ◽  
Double Quantum Dots

Modulation of magnetotransport in asymmetrically coupled double quantum dot system

2016 ◽  
Vol 30 (22) ◽  
pp. 1650266 ◽  
Author(s):  
Yan-Hua Liao ◽  
Jin Huang ◽  
Wei-Zhong Wang
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Quantum Dots ◽  
Energy Level ◽  
Quantum Dot ◽  
Spin Polarization ◽  
Quantum Phase Transition ◽  
Double Quantum ◽  
Double Quantum Dot ◽  
Double Quantum Dots

We study the transport properties in double quantum dots asymmetrically coupled to leads in magnetic field. We focus on the situation in which the second dot (QD2) couples with the leads with a weak hybridization function. The results shows that by tuning the energy level [Formula: see text] of QD2 one can control the conductance and its spin polarization of the system. In the absence of magnetic field [Formula: see text], with increasing [Formula: see text], the conductance shows a dip structure. This behavior of conductance results from a continuous triplet–doublet quantum phase transition. In the presence of magnetic field [Formula: see text], we obtain a perfect spin filtering with a fully-polarized conductance of up-spin or down-spin.

Quantum Phase Transition from Superparamagnetic to Quantum Superparamagnetic State in Ultrasmall Cd1–xCr(II)xSe Quantum Dots?

2011 ◽  
Vol 134 (4) ◽  
pp. 2172-2179 ◽  
Author(s):  
Weiwei Zheng ◽  
Pushpendra Kumar ◽  
Aaron Washington ◽  
Zhenxing Wang ◽  
Naresh S. Dalal ◽  
...  
Keyword(s):  
Phase Transition ◽  
Quantum Dots ◽  
Quantum Phase Transition ◽  
Quantum Phase ◽  
Superparamagnetic State
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