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arXiv · 1708.01908

Absence of cyclotron resonance in the anomalous metallic phase in InO$_x$

Youcheng Wang·Idan Tamir·Dan Shahar·N. P. Armitage
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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.

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Youcheng Wang, Idan Tamir, Dan Shahar, N. P. Armitage. 2017-08-06. Absence of cyclotron resonance in the anomalous metallic phase in InO$_x$. https://doi.org/10.1103/physrevlett.120.167002

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