arXiv 0905.27902009-05cond-mat.mtrl-scicond-mat.other

$p$型GaAs量子阱中的电子自旋弛豫

Electron spin relaxation in $p$-type GaAs quantum wells

Y. Zhou, J. H. Jiang, M. W. Wu

备注：: 10 pages, 5 figures, to be published in New J. Phys
发表信息：: New J. Phys. 11, 113039 (2009)
DOI：: 10.1088/1367-2630/11/11/113039

摘要：

我们从全微观动力学自旋Bloch方程方法研究了$p$型GaAs量子阱中的电子自旋弛豫，包括电子-杂质、电子-声子、电子-电子库仑、电子-空穴库仑和电子-空穴交换（Bir-Aronov-Pikus机制）散射.从这种方法中，我们研究的D 'yakonov-Perel'和Bir-Aronov-Pikus机制的相对重要性，在很宽的范围内的温度，空穴密度，激发密度和杂质密度，并提出了一个相图-样的图片显示的D 'yakonov-Perel'或Bir-Aronov-Pikus机制是更重要的参数制度。通过在我们的模型中包含更多的空穴子带和能带，我们能够研究高空穴密度下的自旋动力学。结果表明，对于不同的杂质和激发密度，在一定的温度范围内，当空穴密度足够高时，Bir-Aronov-Pikus机制可以超过D 'yakonov-Perel'机制.我们还发现，在无杂质的情况下，Bir-Aronov-Pikus机制比D 'yakonov-Perel'机制更有效的温度范围是在空穴费米温度附近，对于高空穴密度，与激发密度无关。然而，在杂质密度与空穴密度相同的高杂质密度情况下，该区域大致为从电子费米温度到空穴费米温度。特别地，在高杂质和很低激发密度的情况下，Bir-Aronov-Pikus机制可以在所研究的{ \em whole}温度范围内（从5 K到300 K）支配自旋弛豫，因为电子（空穴）费米温度是1.5 K。(The由于篇幅所限，其余部分省略）

英文摘要：

We investigate electron spin relaxation in $p$-type GaAs quantum wells from a fully microscopic kinetic spin Bloch equation approach, with all the relevant scatterings, such as the electron-impurity, electron-phonon, electron-electron Coulomb, electron-hole Coulomb and electron-hole exchange (the Bir-Aronov-Pikus mechanism) scatterings explicitly included. From this approach, we examine the relative importance of the D'yakonov-Perel' and Bir-Aronov-Pikus mechanisms in wide ranges of temperature, hole density, excitation density and impurity density, and present a phase-diagram--like picture showing the parameter regime where the D'yakonov-Perel' or Bir-Aronov-Pikus mechanism is more important. By including more hole subbands and bands in our model, we are able to study spin dynamics at high hole density. It is shown that the Bir-Aronov-Pikus mechanism can surpass the D'yakonov-Perel' mechanism in some temperature regime with sufficiently high hole density for various impurity and excitation densities. We also discover that in the impurity-free case the temperature regime where the Bir-Aronov-Pikus mechanism is more efficient than the D'yakonov-Perel' one is around the hole Fermi temperature for high hole density, regardless of excitation density. However, in the high impurity density case with the impurity density being identical to the hole density, this regime is roughly from the electron Fermi temperature to the hole Fermi temperature. Particularly, the Bir-Aronov-Pikus mechanism can dominate the spin relaxation in the {\em whole} temperature regime of the investigation (from 5 K to 300 K) in the case with high impurity and very low excitation densities, since the electron (hole) Fermi temperature is... (The remaining is omitted due to the limit of the space)

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英文摘要：

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