Out-of-Equilibrium Transport Phenomena through a Quantum Dot in a Magnetic Field
Out-of-Equilibrium Transport Phenomena through a Quantum Dot in a Magnetic Field
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磁场中量子点的非平衡输运现象
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
K. Ueda
中科院分区：
文献类型：
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作者：
T. Fujii;K. Ueda
利用Keldysh形式中的自洽微扰理论，研究了弱关联区中有限磁场中点的非平衡输运。随着偏置电压的增加，上下自旋态密度的分离逐渐变小，最终达到塞曼能量。对于微分电导，当磁场增加时，零偏峰分裂成两个峰。分裂的临界场随库仑相互作用的增加而减小。
We investigate nonequilibrium transport through a dot in a finite magnetic field in a weak correlation regime by using the self-consistent perturbation theory in the Keldysh formalism. Separation of the density of states between the up and down spins becomes smaller gradually and ends up with the Zeeman energy as increasing the bias voltage. Concerning the differential conductance the zero-bias peak splits into two peaks when magnetic field is increased. The critical field for the splitting decreases as the Coulomb interaction is increased.