Observability of a projected new state of matter: a metallic superfluid

Abstract

Dissipationless quantum states, such as superconductivity and superfluidity, have attracted interest for almost a century. A variety of systems exhibit these macroscopic quantum phenomena, ranging from superconducting electrons in metals to superfluid liquids, atomic vapours, and even large nuclei. It was recently suggested that liquid metallic hydrogen could form two new unusual dissipationless quantum states, namely the metallic superfluid and the superconducting superfluid. Liquid metallic hydrogen is projected to occur only at an extremely high pressure of about 400 GPa, while pressures on hydrogen of 320 GPa having already been reported. The issue to be adressed is if this state could be experimentally observable in principle. We propose four experimental probes for detecting it.

in print in Phys. Rev. Lett

References in corpus (4)

• A superconductor to superfluid phase transition in liquid metallic hydrogen
• Field- and temperature induced topological phase transitions in the three-dimensional $N$-component London superconductor
• Vortex sub-lattice melting in a two-component superconductor
• Critical properties of the N-color London model

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• Thermodynamic anomalies and three distinct liquid-liquid transitions in warm dense liquid hydrogen
• Ground state, collective mode, phase soliton and vortex in multiband superconductors
• Coupled superfluidity of binary Bose mixtures in two dimensions
• Observation of a metallic superfluid in a numerical experiment
• Vortices and magnetic bags in Abelian models with extended scalar sectors and some of their applications
• Two-dimensional molecular para-hydrogen and ortho-deuterium at zero temperature
• The phases of deuterium at extreme densities