  In the bilayer quantum Hall coherent state for $\nu_T$ deviating slightly
from one, we show that, instead of the global order parameter, the spontaneous
breaking of the pseudospin U(1) rotational symmetry is reflected by the
periodic domain structure accompanying with the charged meron pairs. The motion
of meron pairs induces a novel pseudospin wave. The long range order of the
periodic domains in a low bias voltage range leads to the residual zero-bias
peak in the tunneling conductance even when the pseudopsin Goldstone feature in
a high bias voltage range can be distinct from it.
