Abstract
The spectral functions of pseudospin response functions in the bilayer quantum Hall system at $\ensuremath{\nu}=1$ are investigated numerically, where the pseudospin describes the layer degrees of freedom. In the pseudospin-ferromagnetic phase, the lowest-lying excitation branch is closely connected with the ground state through the fluctuations of pseudospin ${S}_{y}$ and ${S}_{z},$ and this pseudospin-wave excitation branch plays a significant role in the tunneling-current properties in the system.
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