@article{61bea992688d4fcfb8b5cb8918e29f1d,
title = "Finite-temperature violation of the anomalous transverse Wiedemann-Franz law",
abstract = "The Wiedemann-Franz (WF) law has been tested in numerous solids, but the extent of its relevance to the anomalous transverse transport and the topological nature of the wave function, remains an open question. Here, we present a study of anomalous transverse response in the noncollinear antiferromagnet Mn3Ge extended from room temperature down to sub-kelvin temperature and find that the anomalous Lorenz ratio remains close to the Sommerfeld value up to 100 K but not above. The finite-temperature violation of the WF correlation is caused by a mismatch between the thermal and electrical summations of the Berry curvature and not by inelastic scattering. This interpretation is backed by our theoretical calculations, which reveals a competition between the temperature and the Berry curvature distribution. The data accuracy is supported by verifying the anomalous Bridgman relation. The anomalous Lorenz ratio is thus an extremely sensitive probe of the Berry spectrum of a solid.",
author = "Liangcai Xu and Xiaokang Li and Xiufang Lu and Clement Collignon and Huixia Fu and Jahyun Koo and Benoit Fauque and Binghai Yan and Zengwei Zhu and Kamran Behnia",
note = "We thank A. Subedi for numerous discussions. Funding: This work was supported by the National Science Foundation of China (grant nos. 51861135104 and 11574097) and the National Key Research and Development Program of China (grant no.2016YFA0401704). Z.Z. was supported by the 1000 Youth Talents Plan. K.B. was supported by China High-end Foreign Expert program, Fonds ESPCI Paris, and the KITP through NSF grant no. NSF PHY17-48958. B.Y. acknowledges the financial support by the Willner Family Leadership Institute for the Weizmann Institute of Science, the Benoziyo Endowment Fund for the Advancement of Science, the Ruth and Herman Albert Scholars Program for New Scientists, and the European Research Council (ERC) under the European Union Horizon 2020 Research and Innovation Programme (grant agreement no. 815869). B.Y. thanks the fruitful discussion with Y. Zhang at the Max Planck Institute in Dresden. Author contributions: Z.Z. and K.B. conceived and supervised the research project. L.X. prepared the samples. L.X. carried out the experiments with help from X. Li, X. Lu, C.C., and B.F. H.F., J.K., and B.Y. made the theoretical calculations. L.X., B.Y., Z.Z., and K.B. wrote the paper, and all authors commented on the paper.",
year = "2020",
month = apr,
day = "24",
doi = "https://doi.org/10.1126/sciadv.aaz3522",
language = "الإنجليزيّة",
volume = "6",
journal = "Science Advances",
issn = "2375-2548",
publisher = "American Association for the Advancement of Science",
number = "17",
}