2022 International Conference on Solid State Devices and Materials

講演情報

Oral Presentation

09: Novel Functional / Quantum / Spintronic Devices and Materials

[C-8] Spintronics I

2022年9月29日(木) 10:45 〜 12:00 103 (1F)

Session Chair: Shinobu Ohya (Univ. of Tokyo), Hiromasa Shimizu (Tokyo Univ. of Agriculture and Technology)

11:45 〜 12:00

[C-8-04] Bias voltage and temperature dependence of electron-spin polarization in InAs quantum dots tunnel-coupled with a GaNAs quantum well

SOYOUNG PARK1, 〇HIROTO KISE1, SATOSHI HIURA1, JUNICHI TAKAYAMA1, KAZUHISA SUEOKA1, AKIHIRO MURAYAMA1 (1. Hokkaido Univ. (Japan))

Presentation style: On-site (in-person)

https://doi.org/10.7567/SSDM.2022.C-8-04

Bias voltage and temperature dependence of electron-spin polarization in InAs quantum dots (QDs) tunnel-coupled with a GaNAs quantum well have been investigated. The state filling effect in QDs becomes suppressed with increasing temperature because of the thermal excitation and thermal escape of
electron spins, leading to the enhanced circular polarization degree of QD luminescence. We also observe a large difference in the electron-spin polarization at QD excited states by changing the applied bias voltage at higher temperature of 260 K. The high spin polarization can be attributed to the thermally activated spin filtering in a GaNAs quantum well.

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