Phase-resolved Higgs response in superconducting cuprates
Abstract
In high energy physics, the Higgs field couples to gauge bosons and fermions and gives mass to their elementary excitations. Experimentally, such couplings can be inferred from the decay product of the Higgs boson, i.e. the scalar (amplitude) excitation of the Higgs field. In superconductors, Cooper pairs bear a close analogy to the Higgs field. Interaction between the Cooper pairs and other degrees of freedom provides dissipation channel for the amplitude mode, which may reveal important information about the microscopic pairing mechanism. To this end, we investigate the Higgs (amplitude) mode of several cuprate thin films using phase-resolved terahertz third harmonic generation (THG). In addition to the heavily damped Higgs mode itself, we observe a universal jump in the phase of the driven Higgs oscillation as well as a non-vanishing THG above Tc. These findings indicate coupling of the Higgs mode to other collective modes and potentially a nonzero pairing amplitude above Tc.
Cite
@article{arxiv.1901.06675,
title = {Phase-resolved Higgs response in superconducting cuprates},
author = {Hao Chu and Min-Jae Kim and Kota Katsumi and Sergey Kovalev and Robert David Dawson and Lukas Schwarz and Naotaka Yoshikawa and Gideok Kim and Daniel Putzky and Zhi Zhong Li and Hélène Raffy and Semyon Germanskiy and Jan-Christoph Deinert and Nilesh Awari and Igor Ilyakov and Bertram Green and Min Chen and Mohammed Bawatna and Georg Cristiani and Gennady Logvenov and Yann Gallais and Alexander V. Boris and Bernhard Keimer and Andreas P. Schnyder and Dirk Manske and Michael Gensch and Zhe Wang and Ryo Shimano and Stefan Kaiser},
journal= {arXiv preprint arXiv:1901.06675},
year = {2020}
}
Comments
35 pages, 20 figues