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${}_N/\square \le 2000\Omega$) 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.

3 figures in the manuscript and 8 supplementary figures

References in corpus (3)

• Theory of quantum metal to superconductor transitions in highly conducting systems
• Particle-hole symmetry reveals failed superconductivity in the metallic phase of two-dimensional superconducting films
• Hydrodynamic theory of quantum fluctuating superconductivity

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