  We present additional details of the scanning tunneling microscopy (STM)
spectra predicted by the model of pinning of dynamic spin collective modes in
d-wave superconductor proposed by Polkovnikov et al. (cond-mat/0203176). Along
with modulations at the twice the wavevector of the spin collective mode, the
local density of states (LDOS) displays features linked to the spectrum of the
Bogoliubov quasiparticles. The former is expected to depend more strongly on an
applied magnetic field or the doping concentration. The spin collective mode
and the quasiparticles are distinct, co-existing, low energy excitations of the
d-wave superconductor (strongly coupled only in some sectors of the Brillouin
zone), and should not be viewed as mutually exclusive sources of LDOS
modulation.
