Strong Particle-Hole Symmetry Breaking in a 200 kelvin Superconductor

Abstract

The superconducting state of metals has long provided a classic example of particle-hole symmetry (PHS) at low energy. Fermionic self-energy results based on first principles theory for the electron-phonon coupling in H${}_3$S presented here illustrate strong PHS-breaking dynamics arising from the underlying sharp structure in the fermionic density of states. Thus H${}_3$S is not only the superconductor with the highest critical temperature $T_c$ (through 2018), but its low energy, low temperature properties deviate strongly from textbook behavior. The minor momentum and band dependence of the fermionic self-energy allows evaluation of the momentum-resolved and zone-averaged spectral densities and interacting thermal distribution function, all of which clearly illustrate strong particle-hole asymmetry.

arXiv comment7 pages, 5 figures

References in corpus (23)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Advanced capabilities for materials modelling with Quantum ESPRESSO
• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• Conventional superconductivity at 203 K at high pressures
• Electron-phonon interactions from first principles
• EPW: Electron-phonon coupling, transport and superconducting properties using maximally localized Wannier functions
• Crystal Structure of 200 K-Superconducting Phase of Sulfur Hydride System
• Hydrogen sulphide at high pressure: a strongly-anharmonic phonon-mediated superconductor
• Anisotropic Migdal-Eliashberg theory using Wannier functions
• Quantum Hydrogen-Bond Symmetrization and High-Temperature Superconductivity in Hydrogen Sulfide
• What superconducts in sulfur hydrides under pressure, and why
• Coupling Of The B1g Phonon To The Anti-Nodal Electronic States of Bi2Sr2Ca0.92Y0.08Cu2O(8+delta)
• Cubic H${}_3$S around 200 GPa: an atomic hydrogen superconductor stabilized by sulfur
• High temperature superconductivity in sulfur and selenium hydrides at high pressure
• First-principles study of the pressure and crystal-structure dependences of the superconducting transition temperature in compressed sulfur hydrides
• Effect of van Hove singularities on high-Tc superconductivity in H3S
• van Hove singularities and spectral smearing in high temperature superconducting H3S
• Spectroscopy of H${}_3$S: evidence of a new energy scale for superconductivity
• Influence of bonding on superconductivity in high-pressure hydrides
• Possible Superconductivity Approaching Ice Point
• Origin of High-Temperature Superconductivity in Compressed LaH${}_{10}$
• Electron Self-Energy and Generalized Drude Formula for Infrared Conductivity of Metals
• Normal State of the Metallic Hydrogen Sulfide

Cited by in corpus (6)

• Room Temperature Superconductivity: the Roles of Theory and Materials Design
• Doped Mott Insulators Break ${\mathbb{Z}}_2$ Symmetry of a Fermi Liquid: Stability of Strongly Coupled Fixed Points
• Thermodynamics of an Exactly Solvable Model for Superconductivity in a Doped Mott Insulator
• Archetypical "push the band critical point" mechanism for peaking of the density of states in three-dimensional crystals: Theory and case study of cubic H${}_3$S
• Illuminating the Bragg intersections as roots of Dirac nodal lines and high-order van Hove singularities
• Scaling behavior and phases of nonlinear sigma model on real Stiefel manifolds near two dimensions