自旋阀器件中自旋相关电子输运的动力学平均场论
Dynamical Mean-Field Theory for spin-dependent electron transport in spin-valve devices
摘要：
本文将密度泛函理论（DFT）和动力学平均场论（DMFT）结合起来计算电子在双端纳米器件中的传输。该方法被应用到金属结呈现交替的铜和钴层，表现出自旋相关的电荷输运和巨磁电阻（GMR）效应。计算结果表明，电子关联极大地抑制了通过$3d$态的相干传输.这主要是由于电子-电子相互作用引起的有限寿命，并且与计算的多体DMFT自能的虚部直接相关。在费米能量下，根据费米液体行为，自能的虚部为零，透射的抑制完全是由于电子相关引起的能谱的移动。基于我们的研究结果，我们最后建议，在Cu/Co异质结中测量的GMR的能量约为1 eV以上的费米能量的电子是一个明确的表现动力学相关效应。
英文摘要：
We present the combination of Density Functional Theory (DFT) and Dynamical Mean Field Theory (DMFT) for computing the electron transmission through two-terminals nanoscale devices. The method is then applied to metallic junctions presenting alternating Cu and Co layers, which exhibit spin-dependent charge transport and giant magnetoresistance (GMR) effect. The calculations show that the coherent transmission through the $3d$ states is greatly suppressed by electron correlations. This is mainly due to the finite lifetime induced by the electron-electron interaction and is directly related to the imaginary part of the computed many-body DMFT self-energy. At the Fermi energy, where in accordance with the Fermi-liquid behavior the imaginary part of the self-energy vanishes, the suppression of the transmission is entirely due to the shifts of the energy spectrum induced by electron correlations. Based our results, we finally suggest that the GMR measured in Cu/Co heterostructures for electrons with energies about 1 eV above the Fermi energy is a clear manifestation of dynamical correlation effects.
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