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Anomalous mirror symmetry breaking in a model insulating cuprate Sr₂CuO₂Cl₂

de la Torre, A. and Seyler, K. L. and Zhao, L. and Di Matteo, S. and Scheurer, M. S. and Li, Y. and Yu, B. and Greven, M. and Sachdev, S. and Norman, M. R. and Hsieh, D. (2020) Anomalous mirror symmetry breaking in a model insulating cuprate Sr₂CuO₂Cl₂. . (Unpublished)

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Understanding the complex phase diagram of cuprate superconductors is an outstanding challenge. The most actively studied questions surround the nature of the pseudogap and strange metal states and their relationship to superconductivity. In contrast, 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 (AFM) Heisenberg model. 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 perpendicular to the CuO₂ layers. 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 Φ that breaks all perpendicular mirror planes and is consistent with a magneto-chiral state in zero magnetic field. Although Φ is clearly coupled to the AFM order parameter, we are unable to realize its time-reversed partner (−Φ) by thermal cycling through the AFM transition temperature (TN ≈ 260 K) or by sampling different spatial locations. This suggests that Φ onsets above TN and may be relevant to the mechanism of pseudogap formation.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Seyler, K. L.0000-0003-1553-4518
Sachdev, S.0000-0002-2432-7070
Norman, M. R.0000-0002-9459-078X
Hsieh, D.0000-0002-0812-955X
Additional Information:We acknowledge helpful conversations with Dante Kennes, Steve Kivelson, Patrick Lee, Olexei Motrunich, Damjan Pelc and Kemp Plumb. We also thank Louis Taillefer and Gaël Grissonnanche for sharing unpublished data. The SHG work is supported by an ARO PECASE award W911NF-17-1-0204. D.H. also acknowledges support for instrumentation from the David and Lucile Packard Foundation and from the Institute for Quantum Information and Matter (IQIM), an NSF Physics Frontiers Center (PHY-1733907). A.d.l.T. acknowledges support from the Swiss National Science Foundation through an Early Postdoc Mobility Fellowship (P2GEP2 165044). K.L.S. acknowledges a Caltech Prize Postdoctoral Fellowship. S.S. acknowledges support from NSF grant DMR-2002850. M.S.S. acknowledges support from the German National Academy of Sciences Leopoldina through Grant LPDS 2016-12. M.R.N. was supported by the Materials Sciences and Engineering Division, Basic Energy Sciences, Office of Science, U.S. Department of Energy. The work at the University of Minnesota was funded by the U.S. Department of Energy through the University of Minnesota Center for Quantum Materials, under Grant No. DE-SC-0016371.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
Army Research Office (ARO)W911NF-17-1-0204
David and Lucile Packard FoundationUNSPECIFIED
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
Swiss National Science Foundation (SNSF)P2GEP2 165044
Caltech Prize Postdoctoral FellowshipUNSPECIFIED
Deutsche Akademie der Naturforscher LeopoldinaLPDS 2016-12
Department of Energy (DOE)DE-SC-0016371
Record Number:CaltechAUTHORS:20200909-101851261
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105292
Deposited By: Tony Diaz
Deposited On:09 Sep 2020 17:26
Last Modified:18 Nov 2020 00:02

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