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arxiv: cond-mat/0411524 · v1 · pith:SAWCZHWPnew · submitted 2004-11-19 · ❄️ cond-mat.mes-hall

Tuning of the Gap in a Laughlin-Bychkov-Rashba Incompressible Liquid

Marco Califano (1) , Tapash Chakraborty (1) , and Pekka Pietil\"ainen (2) ((1) Department of Physics , Astronomy , University of Manitoba , Winnipeg , Canada , (2) Department of Physical Sciences/Theoretical Physics
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University of Oulu Finland)
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classification ❄️ cond-mat.mes-hall
keywords liquidstatecouplingincompressiblemuchspin-orbitstrengthtuning
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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.

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