Coherent transfer of spin through a semiconductor heterointerface

Phys Rev Lett. 2000 Jan 31;84(5):1015-8. doi: 10.1103/PhysRevLett.84.1015.


Spin transport between two semiconductors of widely different band gaps is time resolved by two-color pump-probe optical spectroscopy. Electron spin coherence is created in a GaAs substrate and subsequently appears in an adjacent ZnSe epilayer at temperatures ranging from 5 to 300 K. The data show that spin information can be protected by transport to regions of low spin decoherence, and regional boundaries used to control the resulting spin coherent phase.