Doppler velocimetry of spin propagation in a two-dimensional electron gas
Doppler velocimetry of spin propagation in a two-dimensional electron gas
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DOI：
10.1038/nphys2157
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发表时间：
2011-12
期刊：
影响因子：
19.6
通讯作者：
Lu-Xing Yang;Lu-Xing Yang;J. Koralek;J. Orenstein;J. Orenstein;D. Tibbetts;J. Reno;M. Lilly
中科院分区：
文献类型：
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作者：
Lu-Xing Yang;Lu-Xing Yang;J. Koralek;J. Orenstein;J. Orenstein;D. Tibbetts;J. Reno;M. Lilly
通过操纵电子的自旋来控制电子的流动是自旋电子学发展的关键。最近在自旋晶体管结构中的电栅控制的演示显示了很大的希望，但在室温下的操作仍然难以捉摸。进一步的进展需要更深入地了解自旋极化的传播，特别是在用于器件的高迁移率半导体中。本文报道了用多普勒测速法解析费米海驱动的砷化镓量子阱中自旋极化电子的运动。我们发现自旋迁移率作为温度的函数精确地跟踪高电子迁移率。然而，我们也观察到，由自旋-轨道相互作用驱动的自旋相干进动，这对于广泛的自旋逻辑器件的运行是必不可少的，在温度超过150 K时，由于理论上尚未理解的原因而破裂。
Controlling the flow of electrons by manipulating their spin is a key to the development of spin-based electronics. Recent demonstrations of electrical-gate control in spin-transistor configurations have shown great promise, but operation at room temperature remains elusive. Further progress requires a deeper understanding of the propagation of spin polarization, particularly in the high-mobility semiconductors used for devices. Here we report the application of Doppler velocimetry to resolve the motion of spin-polarized electrons in GaAs quantum wells driven by a drifting Fermi sea. We find that the spin mobility tracks the high electron mobility precisely as a function of temperature. However, we also observe that the coherent precession of spins driven by spin–orbit interaction, which is essential for the operation of a broad class of spin logic devices, breaks down at temperatures above 150 K, for reasons that are not yet understood theoretically.