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首页> 外文期刊>Physical review >Spin-dependent pump current and noise in an adiabatic quantum pump based on domain walls in a magnetic nanowire
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Spin-dependent pump current and noise in an adiabatic quantum pump based on domain walls in a magnetic nanowire

机译：基于磁性纳米线中畴壁的绝热量子泵中与自旋有关的泵浦电流和噪声

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摘要

We study the pump current and noise properties in an adiabatically modulated magnetic nanowire with double domain walls (DWs). The modulation is brought about by applying a slowly oscillating magnetic and electric fields with a controllable phase difference. The pumping mechanism resembles the case of the quantum dot pump with two-oscillating gates. The pump current, shot noise, and heat flow show peaks when the Fermi energy matches with the spin-split resonant levels localized between the DWs. The peak height of the pump current is an indicator for the lifetime of the spin-split quasistationary states between the DWs. For sharp DWs, the energy absorption from the oscillating fields results in sideband formations observable in the pump current. The pump noise carries information on the correlation properties between the nonequilibrium electrons and the quasiholes created by the oscillating scatterer. The ratio between the pump shot noise and the heat flow serves as an indicator for quasiparticle correlation.
机译：我们研究了具有双畴壁（DWs）的绝热调制磁性纳米线的泵浦电流和噪声特性。通过施加具有可控相位差的缓慢振荡的磁场和电场来实现调制。该泵浦机制类似于带有两个振荡门的量子点泵浦的情况。当费米能量与DW之间的自旋分裂共振能级匹配时，泵浦电流，散粒噪声和热流显示出峰值。泵浦电流的峰值高度是DW之间自旋分裂准静态状态寿命的指标。对于尖锐的DW，来自振荡场的能量吸收会导致在泵浦电流中观察到边带形成。泵浦噪声携带有关非平衡电子与由振荡散射体产生的准孔之间的相关特性的信息。泵散粒噪声和热流之间的比率用作准粒子相关性的指标。

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