Punnoose Alexander, Finkel'stein Alexander M
Lucent Technologies, Bell Labs, Murray Hill, New Jersey 07974, USA.
Phys Rev Lett. 2006 Feb 10;96(5):057202. doi: 10.1103/PhysRevLett.96.057202. Epub 2006 Feb 6.
The D'yakonov-Perel' spin relaxation induced by the spin-orbit interaction is examined in disordered two-dimensional electron gas. It is shown that, because of the electron-electron interactions, substantially different spin relaxation rates may be observed depending on the technique used to extract them. It is demonstrated that the relaxation rate of a spin population is proportional to the spin-diffusion constant D(s), while the spin-orbit scattering rate controlling the weak-localization corrections is proportional to the diffusion constant D, i.e., the conductivity. The two diffusion constants get strongly renormalized by the electron-electron interactions, but in different ways. As a result, the corresponding relaxation rates are different, with the difference between the two being especially strong near a magnetic instability or near the metal-insulator transition.
在无序二维电子气中研究了由自旋轨道相互作用引起的迪亚科诺夫 - 佩雷尔自旋弛豫。结果表明，由于电子 - 电子相互作用，根据用于提取自旋弛豫率的技术不同，可能会观察到显著不同的自旋弛豫率。研究表明，自旋布居的弛豫率与自旋扩散常数D(s)成正比，而控制弱局域化修正的自旋轨道散射率与扩散常数D（即电导率）成正比。这两个扩散常数会因电子 - 电子相互作用而强烈重整化，但方式不同。因此，相应的弛豫率不同，在磁不稳定性附近或金属 - 绝缘体转变附近，两者之间的差异尤为显著。
