Suppression of Direct Spin Hall Currents in Two-Dimensional Electronic Systems with both Rashba and Dresselhaus Spin-Orbit Couplings

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2006,（5）
• 页码范围: 1278-1281
• 页数: 4页
• 语种: 英文

摘要

Based on the Heisenberg equations of motion for the electron orbital and spin degrees of freedom in two-dimensional electronic systems with both Rashba and Dresselhaus spin-orbit couplings, we show that an ac electric field can cause an ac spin Hall current in such a system. In contrast to some previous theoretical prediction, the spin Hall current will be suppressed completely in the dc limit. We argue that the suppression of dc spin Hall currents in such a system is actually a much natural result of the dynamic spin evolution due to the combined action of a dc external electric field and the intrinsic spin-orbit coupling.