What dissipates current in an anomalous metal at low temperature?
In plain words
If the anomalous metal is real, something must let current lose energy even though the film is nearly superconducting. Candidates include quantum tunneling of magnetic vortices and superconducting islands coupled through normal metal.
Precise statement
Given an intrinsic saturated resistance $\rho_0 \ll h/e^{2}$ near the 2D superconductor-insulator transition, identify the dissipation mechanism: quantum vortex creep or vortex liquid, a Bose metal of uncondensed Cooper pairs, superconducting puddles coupled through a dissipative bath (failed superconductor), or a quantum Griffiths regime. An answer predicts $\rho_0(B)$, the reported vanishing Hall resistance (Breznay and Kapitulnik 2017), the $h/2e$ magnetoresistance oscillations seen in patterned films (Yang et al. 2019), and the noise spectrum.
What would settle it
A theory predicting $\rho_0(B)$, the Hall response and $h/2e$ oscillations, confirmed quantitatively in one controlled system.
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