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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 43: Correlated Electrons: Metal-Insulator Transition 2

TT 43.5: Talk

Thursday, March 29, 2012, 16:00–16:15, H 3010

Signature of antiferromagnetic long range order in the optical spectrum of strongly correlated electron systems — •Ciro Taranto1, Giorgio Sangiovanni1, Antoine Georges2,3,4, Massimo Capone5, Alessandro Toschi1, and Karsten Held11Institute for Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria — 2Centre de Physique Théorique, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France — 3Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France — 4DPMC, Université de Genève, 24 quai Ernest Ansermet, CH-1211 Genève, Suisse — 5Democritos National Simulation Center, Consiglio Nazionale delle Ricerche, Istituto Officina dei Materiali (IOM) and Scuola Internazionale Superiore di Studi Avanzati (SISSA), Via Bonomea 265, 34136 Trieste, Italy

We show how the onset of a non-slater antiferromagnetic ordering in a correlated material can be detected by optical spectroscopy. Using dynamical mean-field theory we identify [1] two distinct features: The antiferromagnetic ordering is associated with an enhanced spectral weight above the optical gap, and well separated spin-polaron peaks emerge in the optical spectrum. Both features are indeed observed in LaSrMnO4[2].
C. Taranto, G. Sangiovanni, A. Georges, M. Capone, K. Held and A. Toschi, in preparation.
A. Gössling, M. W. Haverkort, M. Benomar, Hua Wu, D. Senff, T. Möller, M. Braden, J. A. Mydosh and M. Grüninger, Phys. Rev. B 77 , 035109 (2008).

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