Ferromagnetic Phase in Nonequilibrium Quantum Dots.

Ferromagnetic Phase in Nonequilibrium Quantum Dots.
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非平衡量子点中的铁磁相

DOI:
10.1038/s41598-017-18440-5
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发表时间:
2017-12-22
期刊:
影响因子:
4.6
通讯作者:
Yan Y
Yan Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Hou W;Wang Y;Wei J;Yan Y

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通过使用层级运动方程方法非微扰地求解非平衡安德森双杂质模型,我们报道了串联耦合双量子点中一种稳健的铁磁(FM)相,它在强关联极限下的有限偏压和失谐能时能够抑制反铁磁(AFM)相并在相图中占主导地位。铁磁交换相互作用源于电子输运过程中泡利不相容原理导致的被动平行自旋排列。在极低温度下,铁磁相中的磁矩的近藤屏蔽在磁化率、谱函数和电流中引发了一些非平衡近藤效应。在弱关联极限下,发现反铁磁相仍然稳定,因此,通过连续的铁磁 - 反铁磁相变可以预期对自旋态进行无磁场的内部控制。
By nonperturbatively solving the nonequilibrium Anderson two-impurity model with the hierarchical equations of motion approach, we report a robust ferromagnetic (FM) phase in series-coupled double quantum dots, which can suppress the antiferromagnetic (AFM) phase and dominate the phase diagram at finite bias and detuning energy in the strongly correlated limit. The FM exchange interaction origins from the passive parallel spin arrangement caused by the Pauli exclusion principle during the electrons transport. At very low temperature, the Kondo screening of the magnetic moment in the FM phase induces some nonequilibrium Kondo effects in magnetic susceptibility, spectral functions and current. In the weakly correlated limit, the AFM phase is found still stable, therefore, a magnetic-field-free internal control of spin states can be expected through the continuous FM–AFM phase transition.
DOI: 10.1098/rspa.1963.0204
发表时间: 1963-01-01
影响因子: --
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