Superconductivity from energy fluctuations in dilute quantum critical polar metals.

Superconductivity from energy fluctuations in dilute quantum critical polar metals.
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DOI:
10.1038/s41467-022-32303-2
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发表时间:
2022-08-06
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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Superconductivity in low carrier density metals challenges the conventional electron-phonon theory due to the absence of retardation required to overcome Coulomb repulsion. Here we demonstrate that pairing mediated by energy fluctuations, ubiquitously present close to continuous phase transitions, occurs in dilute quantum critical polar metals and results in a dome-like dependence of the superconducting Tc on carrier density, characteristic of non-BCS superconductors. In quantum critical polar metals, the Coulomb repulsion is heavily screened, while the critical transverse optical phonons decouple from the electron charge. In the resulting vacuum, long-range attractive interactions emerge from the energy fluctuations of the critical phonons, resembling the gravitational interactions of a chargeless dark matter universe. Our estimates show that this mechanism may explain the critical temperatures observed in doped SrTiO3. We provide predictions for the enhancement of superconductivity near polar quantum criticality in two- and three-dimensional materials that can be used to test our theory. Superconductivity in low-carrier-density polar metals, such as SrTiO3, challenges the conventional electron-phonon theory due to the absence of retardation required to overcome Coulomb repulsion. Here, the authors propose that energy fluctuations of quantum-critical phonons could account for the superconductivity of SrTiO3.
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