arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0903.4763physics.optics
收藏

用光控制量子点激子的偏振本征态

Controlling the polarization eigenstate of a quantum dot exciton with light

Thomas Belhadj, Claire-Marie Simon, Thierry Amand, Pierre Renucci, Olivier Krebs, Aristide Lemaitre, Paul Voisin, Xavier Marie, Bernhard Urbaszek

摘要:

我们证明了在没有任何外场的情况下,中性量子点激子的偏振本征态的光学控制。通过改变在单个InGaAs量子点上的显微光致发光实验中的圆偏振激光的激发功率,我们控制了通过核自旋的光泵浦产生的有效内部磁场的大小和方向。可调核磁场使我们能够调节中性激子发射的线偏振度和圆偏振度。因此,量子点可以充当可调谐光偏振转换器。

英文摘要:

We demonstrate optical control of the polarization eigenstates of a neutral quantum dot exciton without any external fields. By varying the excitation power of a circularly polarized laser in micro-photoluminescence experiments on individual InGaAs quantum dots we control the magnitude and direction of an effective internal magnetic field created via optical pumping of nuclear spins. The adjustable nuclear magnetic field allows us to tune the linear and circular polarization degree of the neutral exciton emission. The quantum dot can thus act as a tunable light polarization converter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑