Phase diagram of interacting composite fermions in the bilayer nu=2/3 quantum hall effect |
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Authors: | Kumada N Terasawa D Shimoda Y Azuhata H Sawada A Ezawa Z F Muraki K Saku T Hirayama Y |
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Institution: | Department of Physics, Tohoku University, Sendai 980-8578, Japan. |
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Abstract: | We study the phase diagram of composite fermions (CFs) in the presence of spin and pseudospin degrees of freedom in the bilayer nu=2/3 quantum Hall (QH) state. Activation studies elucidate the existence of three different QH states with two different types of hysteresis in the magnetotransport. While a noninteracting CF model provides a qualitative account of the phase diagram, the observed renormalization of tunneling gap and a non-QH state at high densities are not explained in the noninteracting CF model, and are suggested to be manifestations of interactions between CFs. |
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