Cyclotron effect on coherent spin precession of two-dimensional electrons
| Autor: | Griesbeck, M., Glazov, M. M., Korn, T., Sherman, E. Ya., Waller, D., Reichl, C., Schuh, D., Wegscheider, W., Schüller, C. |
|---|---|
| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 80, 241314(R) (2009) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.80.241314 |
| Popis: | We investigate the spin dynamics of high-mobility two-dimensional electrons in GaAs/AlGaAs quantum wells grown along the $[001]$ and $[110]$ directions by time-resolved Faraday rotation at low temperatures. In measurements on the $(001)$-grown structures without external magnetic fields, we observe coherent oscillations of the electron spin polarization about the effective spin-orbit field. In non-quantizing magnetic fields applied normal to the sample plane, the cyclotron motion of the electrons rotates the effective spin-orbit field. This rotation leads to fast oscillations in the spin polarization about a non-zero value and a strong increase in the spin dephasing time in our experiments. These two effects are absent in the $(110)$-grown structure due to the different symmetry of its effective spin-orbit field. The measurements are in excellent agreement with our theoretical model. Comment: 4 pages, 3 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|