Fano interference of the Higgs mode in cuprate high-Tc superconductors
Abstract
Despite decades of search for the pairing boson in cuprate high-Tc superconductors, its identity still remains debated to date. For this reason, spectroscopic signatures of electron-boson interactions in cuprates have always been a center of attention. For example, the kinks in the quasiparticle dispersion observed by angle-resolved photoemission spectroscopy (ARPES) studies have motivated a decade-long investigation of electron-phonon as well as electron-paramagnon interactions in cuprates. On the other hand, the overlap between the charge-order correlations and the pseudogap in the cuprate phase diagram has also generated discussions about the potential link between them. In the present study, we provide a fresh perspective on these intertwined interactions using the novel approach of Higgs spectroscopy, i.e. an investigation of the amplitude oscillations of the superconducting order parameter driven by a terahertz radiation. Uniquely for cuprates, we observe a Fano interference of its dynamically driven Higgs mode with another collective mode, which we reveal to be charge density wave fluctuations from an extensive doping- and magnetic field-dependent study. This finding is further corroborated by a mean field model in which we describe the microscopic mechanism underlying the interaction between the two orders. Our work demonstrates Higgs spectroscopy as a novel and powerful technique for investigating intertwined orders and microscopic processes in unconventional superconductors.
Keywords
Cite
@article{arxiv.2109.09971,
title = {Fano interference of the Higgs mode in cuprate high-Tc superconductors},
author = {Hao Chu and Sergey Kovalev and Zi Xiao Wang and Lukas Schwarz and Tao Dong and Liwen Feng and Rafael Haenel and Min-Jae Kim and Parmida Shabestari and Hoang Le Phuong and Kedar Honasoge and Robert David Dawson and Daniel Putzky and Gideok Kim and Matteo Puviani and Min Chen and Nilesh Awari and Alexey N. Ponomaryov and Igor Ilyakov and Martin Bluschke and Fabio Boschini and Marta Zonno and Sergey Zhdanovich and Mengxing Na and Georg Christiani and Gennady Logvenov and David J. Jones and Andrea Damascelli and Matteo Minola and Bernhard Keimer and Dirk Manske and Nanlin Wang and Jan-Christoph Deinert and Stefan Kaiser},
journal= {arXiv preprint arXiv:2109.09971},
year = {2023}
}