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DTSTART;TZID=Europe/Paris:20220307T140000
DTEND;TZID=Europe/Paris:20220307T180000
DTSTAMP:20220301T100900
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SUMMARY:Shuqiu Wang | Planar-Oxygen Orbital Ordering Mechanism of the Nematic State in Cuprates
DESCRIPTION:\nShuqiu Wang, Claredon Laboratory – Oxford\n\n\n\nUnforeseen among the quantum matter states of hole-doped CuO2 was the electronic nematic phase.  The quantum mechanical mechanism of this intra-unit-cell symmetry breaking state, which emerges concurrently with the enigmatic pseudogap phenomenon, is unknown. However, within the three-orbital Emery model of the CuO2 charge-transfer insulator, theoretical analyses1 now predict a nematic mechanism based on lifting the energy degeneracy of the two oxygen 2p6 orbitals in each unit cell. Such orbital ordering should be identifiable as a difference in charge-transfer energy separating oxygen 2p6 orbitals from the relevant copper 3d10orbital. Here we introduce sublattice resolvedimaging2,3 of charge transfer energy and discover a splitting of between at the two oxygen 2p6 orbitals within a CuO2 unit cell. Visualising the domains of this charge-transfer nematic finds them spatially on the 100 Å scale. Further, we observe the breaking of inversion symmetry in this charge-transfer nematic, as might be anticipated when time-reversal symmetry breaking is also present.  These data reveal that the mechanism of nematicity in the canonical cuprate Bi2Sr2CaCu2O8 is intra-unit-cell orbital ordering of the oxygen 2p6orbitals in the CuO2 plane.\n\n\n\nReferences \n\n\n\nDavis, J. C. S. & Lee, D. H. Proc. Natl. Acad. Sci U. S. A. 110, 17623–17630 (2013).Fujita, K. et al. Proc Natl. Acad. Sci. U. S. A. 111, (2014).Hamidian, M. H. et al. Nat. Phys. 12, 150–156 (2016).Lawler, M. J. et al. Nature 466, 347–351 (2010).\n\n\n\n 1.D\n\n\n\nLe séminaire sera en mode hybride. \n\n\n\nLien Zoom:https://zoom.us/j/96356892672?pwd=QkNyNUk2UkI4WmR6VkVnMDdubm9QQT09\n\n\n\nID de réunion : 963 5689 2672Code secret : Z2NHPq\n
URL:https://www.lps.u-psud.fr/events/shuqiu-wang-planar-oxygen-orbital-ordering-mechanism-of-the-nematic-state-in-cuprates/
ORGANIZER;CN=Marco APRILI:MAILTO:
CATEGORIES:Séminaire Matière Quantique (SMQ),Séminaires
LOCATION:Amphi Blandin (LPS) + ONLINE (Zoom)
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