the question about the Rashba parameter. The problem is presented in the following:
After reading some literatures about "the Rashba effect", I find that there are two different formulas for describing Rashba effect.
one is defined as αR = 2ER/kR (all the R is subscript ) (this formula can be found in the page 3613 in this literature (Nano Lett. 2014, 14, 3608-3616 )).
another is defined as α = ε≠/2△k (this formula can be found in the page 1639 in this literature (J. Phys. Chem. Lett. 2016, 7, 1638−1645 )).
We can find that the position of the coefficient of "2" is different in the above two formulas.
So I do'not know which formula is right? or two formulas are right. I can't understand this well. Can everyone explain this for me?
Spin–orbit coupling is a manifestation of special relativity. In the reference frame of a moving electron, electric fields transform into magnetic fields, which interact with the electron spin and lift the degeneracy of spin-up and spin-down states. In solid-state systems, the resulting spin–orbit fields are referred to as Dresselhaus and Rashba fields, depending on whether the electric fields originate from bulk or structure inversion asymmetry, respectively. Yet, it remains a challenge to determine the absolute value of both contributions in a single sample. Here, we show that both fields can be measured by optically monitoring the angular dependence of the electrons' spin precession on their direction of motion with respect to the crystal lattice. Furthermore, we demonstrate spin resonance induced by the spin–orbit fields. We apply our method to GaAs/InGaAs quantum-well electrons, but it should be universally useful to characterize spin–orbit interactions in semiconductors, and therefore could facilitate the design of spintronic devices.
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