Persistent Spin Helix Propagators

Extensive spintronics work is aimed at achieving high computational speed. Spin coherence is desired in quantum computation. However, spin-orbit coupling which dominates the dynamics in spintronics may lead to spin decoherence. In this talk, we will briefly introduce a class of spin-orbit systems a.k.a Persistent Spin Helix which can lead in principle to infinite spin lifetime. We will analyze the behavior using the quantum propagator formalism.