Strong particle-hole asymmetry in a 200 Kelvin superconductor
Soham S. Ghosh, Yundi Quan, Warren E. Pickett
DOI 10.1103/PhysRevB.100.094521 · Physical Review B
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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 H3S presented here illustrate strong particle-hole asymmetry in the dynamics arising from the underlying sharp structure in the fermionic density of states. Thus H3S not only is the superconductor with the highest critical temperature Tc (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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| H3S Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 203 | 160 GPa | unknown |
| H3S Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 200 | 210 GPa | unknown |
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