Unraveling Fermi liquid charge and heat transport in RuO2
Abstract
RuO2 is a multi-orbital Fermi liquid for which an array of complementary experimental measurements has recently become available, making it a stringent testbed for quantitative many-body electronic structure theory. Using realistic dynamical mean-field calculations, we compute the spectroscopic and transport properties of RuO2 in the paramagnetic state. We identify RuO2 as a moderately correlated Fermi liquid and obtain (semi-)quantitative agreement with experiment for its optical conductivity, electrical resistivity, and thermopower. This broad agreement across complementary observables establishes a ``precision'' many-body description of RuO2 and allows remaining discrepancies to be identified as meaningful tests of the theory. In particular, the calculated electronic thermal resistivity significantly undershoots the experimentally inferred low-temperature thermal resistivity, raising an important puzzle concerning the relative relaxation of charge and heat currents in the Fermi liquid regime. We explore low-temperature electron-phonon scattering as a possible mechanism for resolving this discrepancy, while a fully quantitative description remains an open problem. More broadly, our results demonstrate the power of combining precision DFT+DMFT calculations with complementary experimental probes to build and critically test quantitative descriptions of correlated quantum materials.
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BibTeX
@misc{labollita2026unraveling,
title = {{Unraveling Fermi liquid charge and heat transport in RuO$_2$}},
author = {Harrison LaBollita and Fabian B. Kugler and Antoine Georges and Cyrus E. Dreyer},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.06763},
eprint = {2610.06763},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.06763},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Unraveling Fermi liquid charge and heat transport in RuO_2
AU - Harrison LaBollita
AU - Fabian B. Kugler
AU - Antoine Georges
AU - Cyrus E. Dreyer
PY - 2026
DA - 2026/10/05
PB - arXiv
DO - 10.48550/arxiv.2610.06763
UR - https://arxiv.org/abs/2610.06763
AB - RuO_2 is a multi-orbital Fermi liquid for which an array of complementary experimental measurements has recently become available, making it a stringent testbed for quantitative many-body electronic structure theory. Using realistic dynamical mean-field calculations, we compute the spectroscopic and transport properties of RuO_2 in the paramagnetic state. We identify RuO_2 as a moderately correlated Fermi liquid and obtain (semi-)quantitative agreement with experiment for its optical conductivity, electrical resistivity, and thermopower. This broad agreement across complementary observables establishes a ``precision'' many-body description of RuO_2 and allows remaining discrepancies to be identified as meaningful tests of the theory. In particular, the calculated electronic thermal resistivity significantly undershoots the experimentally inferred low-temperature thermal resistivity, raising an important puzzle concerning the relative relaxation of charge and heat currents in the Fermi liquid regime. We explore low-temperature electron-phonon scattering as a possible mechanism for resolving this discrepancy, while a fully quantitative description remains an open problem. More broadly, our results demonstrate the power of combining precision DFT+DMFT calculations with complementary experimental probes to build and critically test quantitative descriptions of correlated quantum materials.
ER -