Schematic view of the sample (left) and optical reflectivity images of the strait and winding channels (right). Kerr rotation signals for the straight (upper) and winding (lower) channels plotted as a function of external magnetic field and transport distance.
Coherent Manipulation of Moving Electron Spins Using Magnetic-Field-Free Electron Spin Resonance
An electron moving in semiconductors experiences a spin-orbit effective magnetic field that depends on the moving direction. We performed Kerr microscopy to measure the spin dynamics of the electrons travelling along a winding semiconductor channel. The experimental results revealed that the resultant spin dynamics is equivalent to the usual electron spin resonance but requires neither static nor time-dependent real magnetic fields. (Page 41)