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.

arXiv commentin print in Phys. Rev. Lett

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Cited by in corpus (20)

• Magnetic measurements on micron-size samples under high pressure using designed NV centers
• The Melting Line of Hydrogen at High Pressures
• Quantum Monte Carlo study of the phase diagram of solid molecular hydrogen at extreme pressures
• Quartic metal: Spontaneous breaking of time-reversal symmetry due to four-fermion correlations in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Giant anharmonicity suppresses superconductivity in AlH${}_3$ under pressure
• Magnetic field delocalization and flux inversion in fractional vortices in two-component superconductors
• Stable fractional flux vortices and unconventional magnetic state in two-component superconductors
• Thermodynamic anomalies and three distinct liquid-liquid transitions in warm dense liquid hydrogen
• Ground state, collective mode, phase soliton and vortex in multiband superconductors
• Phase structure and phase transitions in a three dimensional SU(2) superconductor
• 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
• Intermolecular coupling and fluxional behavior of hydrogen in phase IV
• Two-dimensional molecular para-hydrogen and ortho-deuterium at zero temperature
• Stability of vortex in a two-component superconductor
• Vortices with scalar condensates in two-component Ginzburg-Landau systems
• The phases of deuterium at extreme densities
• Rotation of quantum liquid without singular vortex lines
• Nuclear condensate and helium white dwarfs