The above figure is Rashba-split free electron-like surface state in a projected bulk band gap. The below figure is the band structure of a topological insulators. x axis is the wave vector, y axis is the energy. red and blue lines are surface states with one spin up one spin down. What is the difference between the two figures why TI has this linear one but the above is parabolic? They all have Rashba spin orbit interaction.
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