Tuning of the Gap in a Laughlin-Bychkov-Rashba Incompressible Liquid
  We report on our investigation of the influence of Bychkov-Rashba spin-orbit interaction (SOI) on the incompressible Laughlin state. We find that experimentally obtainable values of the spin-orbit coupling strength can induce as much as a 25% increase in the quasiparticle-quasihole gap Eg at low magnetic fields in InAs, thereby increasing the stability of the liquid state. The SOI-modulated enhancement of Eg is also significant for filling factors 1/5 and 1/7, where the FQH state is usually weak. This raises the intriguing possibility of tuning, via the SO coupling strength, the liquid to solid transition to much lower densities. 
Marco Califano (1), Tapash Chakraborty (1) and and Pekka Pietil\"ainen   (2) ((1) Department of Physics and Astronomy, Unive...