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Fano-Kondo Effect in Quantum Dot Coupled to Ferromagnetic Leads System Under the Coulomb Interaction

Author: FanMeng
Tutor: WuShaoQuan
School: Sichuan Normal University
Course: Theoretical Physics
Keywords: Quantum dots Kondo effect Kondo resonance Spin polarization Coulomb interaction Kondo temperature Mutations temperature Weak coupling Strong coupling
CLC: O471.1
Type: Master's thesis
Year: 2010
Downloads: 27
Quote: 0
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Abstract


Structure of quantum dots as a typical representative of the quantum effects of mesoscopic system , especially at the the quantum point the tunnel wearing conductance found in a very obvious Fano-Kondo effect phenomenon , which greatly increase in mesoscopic systems to study these two effect of interest. Kondo resonance at the Fermi level at the current provides a new channel , thus mesoscopic Kondo effect leads to the increase of the system conductance . However, due to the influence of the Coulomb interaction between electrons , the density of states of the quantum dots and the transmittance of the system is changed , when the the Coulomb enhanced role of the quantum dots , they mutated . The resulting system conductance capacity mutation . Recently, we focused on the T-shaped double quantum dot system using a scribe Bose mean-field approximation and the Bose field approximation as the average , ie : Vkασ = Vkασba t ab = tab ba bb εm and εm and λm ; while the average ba, bb, λa, λb can be obtained according to the the kinematic equation method and the non-equilibrium Green's function equation , as well as by the Green's function to solve the Hamiltonian with Coulomb interaction , the T-shaped double quantum dot system quantum dots occupies the number Coulomb interaction , the density of states and transmission rate of change in the relationship with the Coulomb interaction . The results of our study found : (1) quantum dots in the Coulomb interaction , mutations temperature , the system has greatly impeded the electronic transport , and mutations temperature varies with the coupling strength Coulomb interaction also change the value of the Kondo temperature ( 2) in the case of weak coupling , the Kondo resonance states of two quantum dots did not form an effective molecules and molecular state will be pseudopotential to suppress ; case of strong coupling , bound and anti - bound state formation two quantum dot coupling effects become more obvious , a more obvious man-made molecules also formed , each quantum dot Kondo state interactions to increase , bound and anti - bound state corresponds to the level of natural split system formed in the vicinity of the Fermi energy Kondo resonance peak split into two peaks . The new results are expected to play a guiding significance of electron correlation in the study of spintronics

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