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(a) SEM image of patterned Hall bar structure with wire width of 500 nm showing contact designation, (b) and as a function of B for macroscopic InSb QW Hall bar ( wire width), (c) inset: differential for macroscopic Hall bar as a function of 1/B showing clear beating and main panel: FFT of signal suggesting two spin-split sub-bands of the main peak ( and ) corresponding to a Rashba coefficient .
and of the nanoscale Hall bar device measured using laser. Comparison of and at 10 K (a) and temperature dependence of (b) and (c). The two minima in the at in photoresponse corresponding to are indicated by dashed lines. Additional guides for the eye are included which indicate minima (blue dotted) and peaks (red dashed) in at and .
An illustration showing the sign change of the spins as a function of B field with the electron momentum in the y direction. (a) When B = 0, there is finite projection of S along when , (b) the spin projection is increased, and (c) with sufficient negative B field, can reverse sign.
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