Composite-fermion analysis of the double-layer fractional quantum Hall system

Effect of interlayer tunneling in the double-layer fractional quantum Hall system at the total Landau-level filling of ν=1/m (m=odd integer) is analyzed with the composite-fermion approach in which the flux attachment is directly applied to the electron-electron interaction. A comparison with a numerical result indicates that the vertically coupled Laughlin liquids may be regarded as a system of composite fermions with reduced interparticle interactions and unchanged interlayer tunneling, which makes the quantum Hall regime, identified by a gap in the pseudospin-wave excitation mode, wider as ν becomes 1/3, 1/5,....