Phonon-mode specific contributions to room-temperature superconductivity in atomic hydrogen at high pressures

Abstract

We investigate the role of specific phonon mode symmetries for the room temperature superconductivity in atomic hydrogen under large pressure. Using anisotropic Migdal-Eliashberg theory with ab initio input from density functional theory, we show that the $E_u$ phonon modes are the dominant driving force for obtaining such high critical temperatures. When going from 400 to 600 GPa, we find an increased transition temperature, however, the total electron-phonon coupling strength is counterintuitively reduced. Our analysis reveals that this is due to an enhanced contribution to the coupling strength by the $E_u$ phonon mode.

References in corpus (7)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Observation of the Wigner-Huntington Transition to Solid Metallic Hydrogen
• Spectral and Fermi surface properties from Wannier interpolation
• Superconducting hydrides under pressure
• Dissociation of high-pressure solid molecular hydrogen: Quantum Monte Carlo and anharmonic vibrational study
• Superconductivity up to 243 K in yttrium hydrides under high pressure
• Eliashberg theory for spin-fluctuations mediated superconductivity -- Application to bulk and monolayer FeSe