Extremely long quasiparticle spin lifetimes in superconducting aluminium using MgO tunnel spin injectors.
Extremely long quasiparticle spin lifetimes in superconducting aluminium using MgO tunnel spin injectors.
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DOI：
10.1038/nmat2781
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发表时间：
2010-07
期刊：
影响因子：
41.2
通讯作者：
Hyunsoo Yang;See-Hun Yang;S. Takahashi;S. Maekawa;S. Parkin
中科院分区：
文献类型：
--
作者：
Hyunsoo Yang;See-Hun Yang;S. Takahashi;S. Maekawa;S. Parkin
近年来，人们一直在积极寻找用于自旋电子和量子计算设备的长寿命自旋极化载流子。在这里，我们报告说，超导铝层中的自旋极化准粒子具有令人惊讶的长自旋寿命，比正常状态长近一百万倍。寿命是从抑制铝的超导性所产生的自旋极化载流子在铝层中使用隧道自旋注入器的积累。一个汉勒效应，在小的平面内正交场的存在下观察到的，被证明是定量一致的长寿命的自旋极化准粒子的存在下。我们的实验表明，超导状态可以被小电流显着修改，远小于临界电流，这对涉及超导量子比特的设备可能是有用的。
There has been an intense search in recent years for long-lived spin-polarized carriers for spintronic and quantum-computing devices. Here we report that spin-polarized quasiparticles in superconducting aluminium layers have surprisingly long spin lifetimes, nearly a million times longer than in their normal state. The lifetime is determined from the suppression of the aluminium’s superconductivity resulting from the accumulation of spin-polarized carriers in the aluminium layer using tunnel spin injectors. A Hanle effect, observed in the presence of small in-plane orthogonal fields, is shown to be quantitatively consistent with the presence of long-lived spin-polarized quasiparticles. Our experiments show that the superconducting state can be significantly modified by small electric currents, much smaller than the critical current, which is potentially useful for devices involving superconducting qubits.