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Electronic Relation Effects on Kondo Resonances in the Series-coupled Double Quantum Dots

Author: ChenJiaFeng
Tutor: WuShaoQuan
School: Sichuan Normal University
Course: Theoretical Physics
Keywords: Quantum dots Kondo effect Kondo resonance Coulomb repulsion Spin polarization Anderson model
CLC: O471.1
Type: Master's thesis
Year: 2010
Downloads: 44
Quote: 0
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Abstract


Because as quantum dots show low-dimensional quantum effects of mesoscopic system and become a typical representative of a research hotspot in recent years, especially Kondo effect in quantum dot tunneling conductance was discovered, the Kondo effect of this unique phenomenon became cohesion state physics, a very well-known and widely studied topic. Kondo phenomenon originated in dilute magnetic alloys in low temperature physics anomalies in recent years with advances in nanotechnology and quantum dots can be embedded into a circuit which makes the man can be studied under controlled conditions mesoscopic Kondo effect as possible, It evokes new interest Kondo phenomenon. In quantum dot system, because the Fermi level at the Kondo resonance for the current provides a new channel, mesoscopic Kondo effect leads to an increase in conductance of the system, which is different from the Kondo effect in dilute magnetic alloys are caused by temperature increase in the resistance. There has been many efforts to study the ferromagnetic electrode coupled to a serial double quantum dot system, transport properties, however, consider only the Coulomb interaction of quantum dot impact (point Coulomb repulsion inside) but ignored between quantum dots Coulomb interaction effects (Coulomb repulsion between points). Based on this we are very interesting to look at the Coulomb interaction between quantum dots is how it affects the serial double quantum dot system, transport properties, the results showed that: (ⅰ) the system is in equilibrium, when considering the serial double quantum dots Coulomb repulsion between, regardless of the magnetic electrodes are parallel or anti-parallel to the magnetic moment, spin-up and spin-down Kondo resonance peaks are subject to some degree of inhibition, and with the enhancement of the Coulomb repulsion of the results of the more obvious . (Ⅱ) However, the system is non-equilibrium conditions, the same quantum Coulomb repulsion between the points can not be ignored, regardless of the magnetic electrodes are parallel or anti-parallel to the magnetic moment, the spin-up and spin-down formant Kondo but had a certain degree of reinforcement. This two situations are diametrically opposed. In addition, we also briefly discuss the quantum Coulomb interaction between the system transmission rate and the occupation numbers of relationships. These properties obtained for studying double quantum dot string provides more transport properties, and these properties of the system co-exist due to Coulomb repulsion and Kondo effect interactions. The new results are expected in the study spintronics in terms of electron correlation play some guidance. Meanwhile, we hope, whether in theory or experiment, there were more systems of quantum dots of electron correlation effects.

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CLC: > Mathematical sciences and chemical > Physics > Semiconductor physics > Semiconductive Theory > Semiconductor quantum theory
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