Mirror symmetry breaking in a model insulating cuprate

Autor: Liuyan Zhao, Martin Greven, Michael R. Norman, A. de la Torre, S. Di Matteo, Biqiong Yu, David Hsieh, Yangmu Li, Subir Sachdev, Kyle L. Seyler, Mathias S. Scheurer
Přispěvatelé: California Institute of Technology (CALTECH), University of Michigan [Ann Arbor], University of Michigan System, Institut de Physique de Rennes (IPR), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Harvard University, Universität Innsbruck [Innsbruck], University of Minnesota [Crookston], University of Minnesota System, Argonne National Laboratory [Lemont] (ANL), ARO PECASE award [W911NF-17-1-0204], NSF Physics Frontiers Center National Science Foundation (NSF) [PHY-1733907], Swiss National Science Foundation through an Early Postdoc Mobility Fellowship [P2GEP2_165044], Caltech Prize Postdoctoral Fellowship, NSF National Science Foundation (NSF) [DMR-2002850], German National Academy of Sciences Leopoldina [LPDS 2016-12], Materials Sciences and Engineering Division, Basic Energy Sciences, Office of Science, US Department of Energy United States Department of Energy (DOE), US Department of Energy through the University of Minnesota Center for Quantum Materials United States Department of Energy (DOE) [DE-SC-0016371], Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Harvard University [Cambridge]
Rok vydání: 2021
Předmět:
Zdroj: Nature Physics
Nature Physics, 2021, 17 (7), pp.777-781. ⟨10.1038/s41567-021-01210-6⟩
Nature Physics, Nature Publishing Group, 2021, ⟨10.1038/s41567-021-01210-6⟩
ISSN: 1745-2481
1745-2473
1476-4636
Popis: Among the most actively studied issues in the cuprates are the natures of the pseudogap and strange metal states and their relationship to superconductivity1. There is general agreement that the low-energy physics of the Mott-insulating parent state is well captured by a two-dimensional spin S = 1/2 antiferromagnetic Heisenberg model2. However, recent observations of a large thermal Hall conductivity in several parent cuprates appear to defy this simple model and suggest proximity to a magneto-chiral state that breaks all mirror planes that are perpendicular to the CuO2 layers3–6. Here we use optical second harmonic generation to directly resolve the point group symmetries of the model parent cuprate Sr2CuO2Cl2. We report evidence of an order parameter that breaks all perpendicular mirror planes and is consistent with a magneto-chiral state in zero magnetic field. Although this order is clearly coupled to the antiferromagnetism, we are unable to realize its time-reversed partner by thermal cycling through the antiferromagnetic transition temperature or by sampling different spatial locations. This suggests that the order onsets above the Neel temperature and may be relevant to the mechanism of pseudogap formation. Several cuprate superconductors were recently shown to have chiral phonons. Here second harmonic generation measurements show that antiferromagnetism breaks all mirror symmetries in a related compound, consistent with a chiral state.
Databáze: OpenAIRE
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