Abstract
The superconducting state of metals has long provided a classic example of particle-hole symmetry at low energy. Fermionic self-energy results based on first-principles theory for the electron-phonon coupling in presented here illustrate strong particle-hole asymmetry in the dynamics arising from the underlying sharp structure in the fermionic density of states. Thus not only is the superconductor with the highest critical temperature (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.
- Received 23 May 2019
- Revised 7 August 2019
DOI:https://doi.org/10.1103/PhysRevB.100.094521
©2019 American Physical Society