Chiral phonon mediated high-temperature superconductivity

Yi Gao; Yang Pan; Jun Zhou; Lifa Zhang

doi:10.1103/PhysRevB.108.064510

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Chiral phonon mediated high-temperature superconductivity

Yi Gao, Yang Pan, Jun Zhou, Lifa Zhang

DOI 10.1103/PhysRevB.108.064510 · Physical Review B

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Abstract

Breaking down the traditional perception on phonons which are achiral, the existence of a chiral phonon carrying angular momentum provides possible ways to couple electrons, photons, spins, magnons, and excitons, etc. We theoretically proposed an electron-chiral phonon interaction with a two-phonon process, in contrast to a conventional electron-phonon interaction, and a kind of effective Hubbard interaction through exchanging two chiral phonons is proposed. Taking a two-dimensional diatomic honeycomb lattice as an example, we found this repulsive Hubbard interaction mediated by chiral phonons induces unconventional and high-temperature superconductivity. Moreover, the numerical calculations show an inverse isotope effect which is consistent with experimental observations in high-Tc superconductors. Our finding on an electron-chiral phonon and the associated Cooper pair provides a path to understand the high-Tc superconductivity.