Bulaev Denis V, Loss Daniel
Department of Physics and Astronomy, University of Basel, Switzerland.
Phys Rev Lett. 2005 Aug 12;95(7):076805. doi: 10.1103/PhysRevLett.95.076805. Epub 2005 Aug 11.
We investigate heavy-hole spin relaxation and decoherence in quantum dots in perpendicular magnetic fields. We show that at low temperatures the spin decoherence time is 2 times longer than the spin relaxation time. We find that the spin relaxation time for heavy holes can be comparable to or even longer than that for electrons in strongly two-dimensional quantum dots. We discuss the difference in the magnetic-field dependence of the spin relaxation rate due to Rashba or Dresselhaus spin-orbit coupling for systems with positive (i.e., GaAs quantum dots) or negative (i.e., InAs quantum dots) g factor.
我们研究了垂直磁场中量子点内重空穴的自旋弛豫和退相干。我们表明，在低温下，自旋退相干时间比自旋弛豫时间长两倍。我们发现，在强二维量子点中，重空穴的自旋弛豫时间可以与电子的自旋弛豫时间相当，甚至更长。我们讨论了对于具有正（即砷化镓量子点）或负（即砷化铟量子点）g因子的系统，由于 Rashba 或 Dresselhaus 自旋轨道耦合导致的自旋弛豫率对磁场依赖性的差异。
