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XIA, J. S; PAN, W; VICENTE, C. L; ADAMS, E. D; SULLIVAN, N. S; STORMER, H. L; TSUI, D. C; PFEIFFER, L. N; BALDWIN, K. W; WEST, K. W
Physical review letters, 10/2004, Letnik: 93, Številka: 17Journal Article
At a very low-temperature of 9 mK, electrons in the second Landau level of an extremely high-mobility two-dimensional electron system exhibit a very complex electronic behavior. With a varying filling factor, quantum liquids of different origins compete with several insulating phases leading to an irregular pattern in the transport parameters. We observe a fully developed nu=2+2/5 state separated from the even-denominator nu=2+1/2 state by an insulating phase and a nu=2+2/7 and nu=2+1/5 state surrounded by such phases. A developing plateau at nu=2+3/8 points to the existence of other even-denominator states.
