[21p-S621-1~19] CS.3 3.11/13.7 Code-sharing session

▼ [21p-S621-7] Modulation of Dynamic Nuclear Spin Polarization in Single InAs/GaAs Quantum Dots by Photonic Bandgap Effect

〇(D)CheeFai Fong¹, Yasutomo Ota², Satoshi Iwamoto^1,2, Yasuhiko Arakawa^1,2 (1.IIS, Univ. of Tokyo, 2.Nanoquine)

Keywords:Quantum dot,Nuclear spin,Photonic crystal

Self-assembled quantum dot (QD) is a promising candidate for spin-based quantum information application. However, in III-V semiconductors, the fluctuating nuclear spin environment has been a source of spin decoherence. Dynamic nuclear spin polarization (DNP) which involves the transfer of electron spin to the nuclei has been proposed as a method to eliminate or reduce the nuclear spin fluctuation.One of the main obstacles in achieving high nuclear spin polarization degrees is the requirement for fast injection and removal of spin polarized electrons from the QD which would beultimately limited by the radiative lifetime of the confined carriers in a QD.Here, we report the modification of DNP in single InAs/GaAs QDs embedded in 2D photonic crystals (PhC), in which photonic bandgap effect modifies QD’s radiative process. We observed that the modified radiative lifetime significantly alters the DNP physics in QDs. This result will open the way for controlling DNP by photonic nanostructures.