Magneto‐anisotropy of spin dephasing in a [001]‐grown high‐mobility two‐dimensional electron system
Magneto‐anisotropy of spin dephasing in a [001]‐grown high‐mobility two‐dimensional electron system
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DOI：
10.1063/1.3295486
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发表时间：
2010-01
期刊：
影响因子：
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通讯作者：
T. Korn;D. Stich;R. Schulz;D. Schuh;W. Wegscheider;C. Schüller
中科院分区：
文献类型：
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作者：
T. Korn;D. Stich;R. Schulz;D. Schuh;W. Wegscheider;C. Schüller
[001]生长的二维电子系统（2DES）在低温下的自旋动力学是由有效的自旋轨道场控制的，它通过D 'yakonov - Perel机制导致失相。如果Rashba和Dresselhaus自旋轨道场同时存在且顺序相同，则它们的干涉会导致沿不同平面方向自旋方向的自旋减相时间的各向异性。这可以在使用平面内磁场的时间分辨法拉第旋转测量中观察到。随着载流子密度的增加，kubic Dresselhaus项的重要性增加，消相各向异性大大降低。
The spin dynamics in [001]‐grown two‐dimensional electron systems (2DES) at low temperatures are governed by the effective spin‐orbit fields, which lead to dephasing via the D’yakonov‐Perel mechanism. If both the Rashba and the Dresselhaus spin‐orbit fields are present and of the same order, their interference causes a large anisotropy of the spin dephasing times for spin orientation along different in‐plane directions. This may be observed in time‐resolved Faraday rotation measurements using in‐plane magnetic fields. The dephasing anisotropy is strongly reduced for increasing carrier density by the increasing importance of the kubic Dresselhaus term.