The natures of the ground state in a nu(T)=1 bilayer quantum Hall system at a variety of layer spacing are investigated. At small layer separations the system exhibits spontaneous interlayer phase coherence. It is claimed that the Halperin's (1,1,1) state is not relevant in the incompressible regime near the incompressible to compressible transition point in which the Josephson-like effect was observed. The two-particle correlation function shows the deflated correlation hole at this regime. An effective model that can give a good approximation to the ground state is proposed. A connection to the modified composite fermion theory is discussed.
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Stockholm Univ, Stockholm Ctr Phys Astron & Biotechnol, Dept Phys, S-10691 Stockholm, SwedenStockholm Univ, Stockholm Ctr Phys Astron & Biotechnol, Dept Phys, S-10691 Stockholm, Sweden
Sjöstrand, J
Eklund, A
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Stockholm Univ, Stockholm Ctr Phys Astron & Biotechnol, Dept Phys, S-10691 Stockholm, SwedenStockholm Univ, Stockholm Ctr Phys Astron & Biotechnol, Dept Phys, S-10691 Stockholm, Sweden
Eklund, A
Karlhede, A
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Stockholm Univ, Stockholm Ctr Phys Astron & Biotechnol, Dept Phys, S-10691 Stockholm, SwedenStockholm Univ, Stockholm Ctr Phys Astron & Biotechnol, Dept Phys, S-10691 Stockholm, Sweden