  We investigate the quasi-normal mode (QNM) spectra for scalar and
electromagnetic fields over a covairant loop quantum gravity black hole
(LQG-BH). For the fundamental modes, the LQG effect reduces the oscillations in
the scalar field, however it induces stronger oscillations in the
electromagnetic field, comparing to the classical case. Under the scalar field
perturbation, the system enjoys faster decaying modes with more oscillations
than the electromagnetic field. Some peculiar phenomena emerge in the QNM
spectra with higher overtones. A notable feature is the substantial divergence
observed in the first several overtones from their Schwarzschild counterparts,
with this discrepancy magnifying as the overtone number increases. Another
remarkable phenomenon in higher overtones is that the QNFs of the scalar field
with $l=0$ exhibit an oscillatory behavior as the quantum parameter $r_0$
increases significantly. These oscillations intensify with the rising overtone
number. We hypothesize that this oscillatory pattern may be associated with the
extremal effect.
