[19p-W241-2~12] 10.4 Semiconductors, organic, optical, and quantum spintronics

▲ [19p-W241-10] Enhancement of spin transport length with tailored spin-orbit interactio

〇Yoji Kunihashi¹, Haruki Sanada¹, Hideki Gotoh¹, Koji Onomitsu¹, Makoto Kohda², Junsaku Nitta², Tetsuomi Sogawa¹ (1.NTT BRL, 2.Tohoku Univ.)

Keywords:spin-orbit interaction,Kerr rotation

Recently, a lot of attention has focused on the suppression of spin relaxation in two-dimensional electron systems with balanced Rashba and k-linear Dresselhaus spin-orbit interactions (SOIs). The characteristic spin dynamics in such electron systems result in a long-lasting helical spin mode termed a persistent spin helix (PSH). However, spin coherence in the PSH state is inevitably destroyed by the k-cubic term of the Dresselhaus SOI in a realistic material. Here, we report that spin coherence is enhanced by an electrically controlled cubic Dresselhaus SOI. We found that spin coherence can be improved by balancing a Rashba SOI and all the terms of a Dresselhaus SOI. This technique will provide a new way of both suppressing spin relaxation and controlling spin precession frequency when using the cubic Dresselhaus SOI.