Ultrafast spin tunneling and injection in coupled nanostructures of InGaAs quantum dots and quantum well

作者：Yang Xiao Jie^*; Kiba Takayuki; Yamamura Takafumi; Takayama Junichi; Subagyo Agus; Sueoka Kazuhisa; Murayama Akihiro

来源：Applied Physics Letters, 2014, 104(1): 012406.

DOI：10.1063/1.4861387

We investigate the electron-spin injection dynamics via tunneling from an In0.1Ga0.9As quantum well (QW) to In0.5Ga0.5As quantum dots (QDs) in coupled QW-QDs nanostructures. These coupled nanostructures demonstrate ultrafast (5 to 20 ps) spin injection into the QDs. The degree of spin polarization up to 45% is obtained in the QDs after the injection, essentially depending on the injection time. The spin injection and conservation are enhanced with thinner barriers due to the stronger electronic coupling between the QW and QDs.

• 出版日期2014-1-6