2022 International Conference on Solid State Devices and Materials

Presentation information

Oral Presentation

05: Photonics: Devices / Integration / Related Technology

[A-6] III-V Light Sources

Wed. Sep 28, 2022 1:30 PM - 3:45 PM 101 (1F)

Session Chair: Yuhki Itoh (Sumitomo Electric Industries, Ltd.), Nobuhiko Ozaki (Wakayama Univ.)

2:30 PM - 2:45 PM

[A-6-05] Room-temperature operation characteristics of a spin-polarized light-emitting diode using InAs quantum dots tunnel-coupled with GaNAs

〇Kohei Etou1, Satoshi Hiura1, Junichi Takayama1, Agus Subagyo1, Kazuhisa Sueoka1, Akihiro Murayama1 (1. Faculty of Information Science and Technology, Hokkaido University (Japan))

Presentation style: On-site (in-person)

https://doi.org/10.7567/SSDM.2022.A-6-05

We have developed a spin-polarized light-emitting diode (spin LED) using InAs quantum dots (QDs) tunnel-coupled with a GaNAs quantum well, which can amplify the electron spin polarization in QDs at room temperature due to the thermally activated spin filtering in GaNAs. Since conduction band electrons are easily trapped in deep-level defects in GaNAs during LED operation, the introduction of GaNAs can significantly increase the injection current required to obtain a sufficient QD electroluminescence (EL). We also observe the high degree of EL circular polarization ranging from 5 to 6 % under high bias conditions above 4 V. This high spin polarization is due to the selective transfer of minority spins from QDs to GaNAs spin filter via electron wavefunction coupling.

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