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Possible charge analogs of spin-transfer torques in bulk superconductors

机译:散装超导体中自旋传递扭矩的可能电荷类似物

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摘要

Spin transfer torques (STTs) occur when electric currents travel through inhomogeneously magnetized systems and are important for the motion of magnetic textures such as domain walls. Since superconductors are easy-plane ferromagnets in particle-hole (charge) space, it is natural to ask whether any charge duals of STT phenomena exist therein. We find that the superconducting analog of the adiabatic STT vanishes in a bulk superconductor with a momentum-independent order parameter, while the superconducting counterpart of the nonadiabatic STT does not vanish. This nonvanishing superconducting torque is induced by heat (rather than charge) currents and acts on the charge (rather than spin) degree of freedom. It can become significant in the vicinity of the superconducting transition temperature, where it generates a net quasiparticle charge and alters the dispersion and linewidth of low-frequency collective modes.
机译:当电流流过非均匀磁化系统时,会产生自旋传递转矩(STT),这对于诸如畴壁之类的磁性结构的运动很重要。由于超导体在粒子-空穴(电荷)空间中是易平面的铁磁体,因此很自然地要问其中是否存在STT现象的任何电荷对偶。我们发现,绝热STT的超导类似物在具有动量独立阶数参数的体超导体中消失,而非绝热STT的超导对应物则不消失。这种不消失的超导扭矩是由热(而不是电荷)电流感应的,并作用于电荷(而不是自旋)自由度。它在超导转变温度附近会变得很重要,在该温度下它会产生净的准粒子电荷,并改变低频集体模式的色散和线宽。

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