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Electric and thermoelectric phenomena in a multilevel quantum dot attached to ferromagnetic electrodes

机译:附着在铁磁电极上的多级量子点中的电和热电现象

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摘要

Nonequilibrium Green's function formalism is used to study electron and energy transport in the Coulomb-blockade regime through a two-level quantum dot/molecule attached to ferromagnetic leads. Interplay between magnetic and thermoelectric properties is investigated in the nonlinear-response regime and strong spin effects in the nonlinear thermopower are found. Significant spin thermopower S_(spin) can be generated in a relatively wide region of temperature difference △T. It is also shown that spin asymmetry due to presence of one half-metallic and pne nonmagnetic electrodes plays an important role and strongly influences both charge and spin thermopower. S_(spin) varies considerably, if the roles of both leads are interchanged. Spin thermopower is enhanced in the region of higher values of △T, if half-metallic electrode acts as an energy drain. On the other hand, in such a configuration, Pauli spin blockade occurs in electron transport.
机译:非平衡格林函数形式学用于研究通过附着在铁磁导线上的两级量子点/分子在库仑封锁体系中的电子和能量传输。研究了非线性响应条件下磁性能和热电性能之间的相互作用,并在非线性热电中发现了强大的自旋效应。可以在相对较大的温差△T区域内产生很大的自旋热功率S_(spin)。还表明由于存在一个半金属和pne非磁性电极而引起的自旋不对称起着重要作用,并且强烈影响充电和自旋热功率。如果两个引线的角色互换,则S_(自旋)变化很大。如果半金属电极充当能量消耗,则在更高的ΔT值区域内,自旋热功率会提高。另一方面,在这种构造中,在电子传输中发生保利自旋阻断。

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