Title: Absence of cyclotron resonance in the anomalous metallic phase in InO$_x$,
Abstract: It is observed that many thin superconducting films with not too high
disorder level (generally R$_N/\Box \leq 2000 \Omega$) placed in magnetic field
show an anomalous metallic phase where the resistance is low but still finite
as temperature goes to zero. Here we report in weakly disordered amorphous
InO$_x$ thin films, that this "Bose metal" metal phase possesses no cyclotron
resonance and hence non-Drude electrodynamics. Its microwave dynamical
conductivity shows signatures of remaining short-range superconducting
correlations and strong phase fluctuations through the whole anomalous regime.
The absence of a finite frequency resonant mode can be associated with a
vanishing downstream component of the vortex current parallel to the
supercurrent and an emergent particle-hole symmetry of this anomalous metal,
which establishes its non-Fermi liquid character.