Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Focused Session: Resonant Inelastic X-ray Scattering on Magnetic Excitations
TT 7.5: Topical Talk
Montag, 26. März 2012, 18:00–18:40, H 0104
Fractionalization of electronic degrees of freedom in low-dimensional cuprates — •Justine Schlappa1,2, Thorsten Schmitt1, Kejin Zhou1, Krzysztof Wohlfeld3, Jeroen van den Brink3, Maurits Haverkort4, Martin Mourigal5, and Henrik Rønnow5 — 1Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland — 2Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, D-12489 Berlin, Germany — 3Leibniz Institute for Solid State and Materials Research IFW Dresden, D-01171 Dresden, Germany — 4Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany — 5Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Quantum effects become important, when the space symmetry is lowered. In the extreme case of one dimension the fundamental degrees of freedom of the electron can break up into separate quasi-particles, carrying either one of the spin, charge or orbital degrees of freedom. Here we report the study of elementary excitations in the quasi 1D cuprate Sr2CuO3, using high-resolution Resonant Inelastic X-ray Scattering. In the low-energy range the fractionalization of magnons into two-spinons and higher order excitations is observed, as previously reported from neutron scattering [1]. At higher energies we observe the deconfinement of spin and orbital degrees of freedom [2]. This phenomenon allows for the first time a direct observation of strongly dispersive orbital excitations (orbitons).
A.C. Walters et al., Nature Physics 5, 867 (2009).
J. Schlappa, T. Schmitt et al., submitted