Strong electron-phonon coupling driven pseudogap modulation and density-wave fluctuations in a correlated polar metal

Huaiyu (Hugo) Wang (), Yihuang Xiong, Hari Padma, Yi Wang, Ziqi Wang, Romain Claes, Guillaume Brunin, Lujin Min, Rui Zu, Maxwell T. Wetherington, Yu Wang, Zhiqiang Mao, Geoffroy Hautier, Long-Qing Chen, Ismaila Dabo () and Venkatraman Gopalan ()
Additional contact information
Huaiyu (Hugo) Wang: Pennsylvania State University
Yihuang Xiong: Pennsylvania State University
Hari Padma: Pennsylvania State University
Yi Wang: Pennsylvania State University
Ziqi Wang: Pennsylvania State University
Romain Claes: Université catholique de Louvain, Chemin des Étoiles 8
Guillaume Brunin: Matgenix
Lujin Min: Pennsylvania State University
Rui Zu: Pennsylvania State University
Maxwell T. Wetherington: Pennsylvania State University
Yu Wang: Pennsylvania State University
Zhiqiang Mao: Pennsylvania State University
Geoffroy Hautier: Thayer School of Engineering, Dartmouth College, 14 Engineering Drive
Long-Qing Chen: Pennsylvania State University
Ismaila Dabo: Pennsylvania State University
Venkatraman Gopalan: Pennsylvania State University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract There is tremendous interest in employing collective excitations of the lattice, spin, charge, and orbitals to tune strongly correlated electronic phenomena. We report such an effect in a ruthenate, Ca3Ru2O7, where two phonons with strong electron-phonon coupling modulate the electronic pseudogap as well as mediate charge and spin density wave fluctuations. Combining temperature-dependent Raman spectroscopy with density functional theory reveals two phonons, B2P and B2M, that are strongly coupled to electrons and whose scattering intensities respectively dominate in the pseudogap versus the metallic phases. The B2P squeezes the octahedra along the out of plane c-axis, while the B2M elongates it, thus modulating the Ru 4d orbital splitting and the bandwidth of the in-plane electron hopping; Thus, B2P opens the pseudogap, while B2M closes it. Moreover, the B2 phonons mediate incoherent charge and spin density wave fluctuations, as evidenced by changes in the background electronic Raman scattering that exhibit unique symmetry signatures. The polar order breaks inversion symmetry, enabling infrared activity of these phonons, paving the way for coherent light-driven control of electronic transport.

Date: 2023
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DOI: 10.1038/s41467-023-41460-x

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