[14p-C41-1~21] 10.4 Semiconductors, organic, optical, and quantum spintronics

▲ [14p-C41-9] Room temperature spontaneous emission with pure circular polarization on spin-LEDs

〇Nozomi Nishizawa¹, Kazuhiro Nishibayashi¹, Hiro Munekata¹ (1.Tokyo inst. of Tech.)

Keywords:Semiconductor spintronics, Spin dependent emission

We have reported electroluminescence with almost pure circular polarization (CP) and electrical helicity switching at room temperature, which is a breakthrough in the field of semiconductor-based spintronics device and is also attractive as a new monolithic CP light source. The pure CP emission is achieved in the regime of moderately high current density (J > 100 A/cm²) which is far less than that for stimulated emission of conventional stripe lasers. Also, it is achieved although the maximum CP value obtained through radiative recombination of spin-polarized carriers is restricted to be 0.5 by optical selection rules in a degenerated GaAs layer. We report here the experimental data as a clue to the emission mechanism.