[12p-A501-1~16] 10.4 Semiconductor spintronics, superconductor, multiferroics

▲ [12p-A501-10] Spin dynamics of electrons accumulated in light induced potential dots

〇Haruki Sanada¹, Yoji Kunihashi¹, Alexander M. Stramma¹, Yusuke Tanaka¹, Hideki Gotoh¹, Koji Onomitsu¹, Fedele Tagarelli¹, Makoto Kohda², Junsaku Nitta², Takehiko Tawara¹, Tetsuomi Sogawa¹ (1.NTT-BRL, 2.Tohoku Univ.)

Keywords:spin relaxation, spin-orbit interaction

Confining carriers in micro/nano-scale structures is essential technique for controlling spin coherence in semiconductor spintronics. We report a mechanism which enables us to design temporal and reconfigurable potential dots generated by simple light exposure in semiconductors. The results of time and spatially-resolved Kerr rotation measurements performed on a GaAs quantum well reveal that the light-induced dot effectively confines the electrons and enhances the spin lifetime determined by fluctuating spin-orbit effective magnetic fields.