@article{dd7b1e839e6e4f7c9c8e22e2691129dd,
title = "Energy Relaxation and Dynamics in the Correlated Metal Sr2RuO4 via Terahertz Two-Dimensional Coherent Spectroscopy",
abstract = "Discriminating the effects of different kinds of scattering in strongly interacting metals is crucial in their understanding. While momentum or current relaxation can be readily probed via dc resistivity or linear terahertz (THz) spectroscopy, discriminating other kinds of scattering can be more challenging. In this Letter, we argue that the nonlinear optical technique of THz 2D coherent spectroscopy measures the energy relaxation rate in strongly interacting metals. We apply the technique to the Fermi liquid Sr2RuO4 and observe two energy relaxation channels: a fast process (∼0.1 THz) that we interpret as energy loss to the phonon system and a much slower relaxation (≲1 GHz) that we interpret as the relaxation of nonequilibrium phonons. Both rates are at least an order of magnitude slower than the momentum relaxation rate. We show how energy relaxation provides a unique diagnostic into certain kinds of scattering and among other aspects allows a measure of the dimensionless electron-phonon coupling constant. Our observations reveal the versatility of nonlinear THz spectroscopy to measure the energy relaxation dynamics in correlated metals and also highlights the need for improved theoretical understanding of such processes in interacting metals.",
author = "David Barbalas and Ralph Romero and Dipanjan Chaudhuri and Fahad Mahmood and Nair, {Hari P.} and Schreiber, {Nathaniel J.} and Schlom, {Darrell G.} and Shen, {K. M.} and Armitage, {N. P.}",
note = "The authors thank P. Allen, K. Behnia, L. Benfatto, G. Grissonnanche, S. Hartnoll, V.V. Kabanov, K. Katsumi, G. Kotliar, D. Maslov, L. Taillefer, and P. Volkov for helpful discussions. The project at J.H.U. was supported by the NSF-DMR 2226666 and the Gordon and Betty Moore Foundation's EPiQS Initiative through Grant No. GBMF9454. N.P.A. had additional support by the Quantum Materials program at the Canadian Institute for Advanced Research. Research at Cornell was supported by the National Science Foundation [Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials (PARADIM)] under Cooperative Agreement No. DMR-2039380. This research was also funded in part by the Gordon and Betty Moore Foundation's EPiQS Initiative through Grants No. GBMF3850 and No. GBMF9073, NSF No. DMR-2104427, and AFOSR No. FA9550-21-1-0168. Sample preparation was, in part, facilitated by the Cornell NanoScale Facility, a member of the National Nanotechnology Coordinated Infrastructure (NNCI), which is supported by the National Science Foundation Grant No. NNCI-2025233. The authors thank P. Allen, K. Behnia, L. Benfatto, G. Grissonnanche, S. Hartnoll, V.\u2009V. Kabanov, K. Katsumi, G. Kotliar, D. Maslov, L. Taillefer, and P. Volkov for helpful discussions. The project at J.\u2009H.\u2009U. was supported by the NSF-DMR 2226666 and the Gordon and Betty Moore Foundation\u2019s EPiQS Initiative through Grant No. GBMF9454. N.\u2009P.\u2009A. had additional support by the Quantum Materials program at the Canadian Institute for Advanced Research. Research at Cornell was supported by the National Science Foundation [Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials (PARADIM)] under Cooperative Agreement No. DMR-2039380. This research was also funded in part by the Gordon and Betty Moore Foundation\u2019s EPiQS Initiative through Grants No. GBMF3850 and No. GBMF9073, NSF No. DMR-2104427, and AFOSR No. FA9550-21-1-0168. Sample preparation was, in part, facilitated by the Cornell NanoScale Facility, a member of the National Nanotechnology Coordinated Infrastructure (NNCI), which is supported by the National Science Foundation Grant No. NNCI-2025233.",
year = "2025",
month = jan,
day = "24",
doi = "10.1103/PhysRevLett.134.036501",
language = "English (US)",
volume = "134",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "3",
}