Speaker
Dr
K Wohlfeld
(Leibniz Institute for Solid State and Materials Research IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany)
Description
Due to the recent advancements in experiment and theory, the resonant inelastic x-ray scattering (RIXS) performed at the L edge of transition metal ions is emerging as a powerful probe to study salient features of the strongly correlated electron systems. For example a recently performed RIXS experiment at the copper L3 edge in quasi one-dimensional Sr2CuO3 reveals orbital excitations with a surprisingly large dispersion. This first undoubted observation of a dispersing orbital excitation in a transition metal oxide is already interesting in itself. A detailed theoretical study, however, shows that this dispersion evidences a fractionalization of spin and orbital excitations in Sr2CuO3 and is due to spin-orbital separation of the RIXS excitation: in the one-dimensional CuO3 chains the orbital degree of freedom decouples from the spin one and becomes mobile with an unexpectedly large dispersion. This fractionalization of the excitation bears similarities to the spin-charge separation that has previously been observed with ARPES.
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Talk
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RIXS
Primary author
Dr
K Wohlfeld
(Leibniz Institute for Solid State and Materials Research IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany)
Co-authors
Dr
A Revcolevschi
(ICMMO - UMR 8182 - Bât. 410, Université Paris-Sud 11, 91405 Orsay Cedex, France)
Dr
C Monney
(Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland)
Prof.
H M Ronnow
(EPF Lausanne (EPFL), CH-1015 Lausanne, Switzerland)
Dr
J S Caux
(Institute for Theoretical Physics, Universiteit van Amsterdam, 1090 GL Amsterdam, The Netherlands)
Dr
J Schlappa
(Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland)
Dr
J van den Brink
(Leibniz Institute for Solid State and Materials Research Dresden, D-01171 Dresden, Germany)
Dr
K J Zhou
(Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland)
Dr
L Hozoi
(Leibniz Institute for Solid State and Materials Research Dresden, D-01171 Dresden, Germany)
Dr
L Patthey
(Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland)
Dr
M Mourigal
(EPF Lausanne (EPFL), CH-1015 Lausanne, Switzerland)
Dr
M W Haverkort
(Max-Planck-Institut für Festkörperforschung, D-70506 Stuttgart, Germany)
Dr
S Nishimoto
(Leibniz Institute for Solid State and Materials Research Dresden, D-01171 Dresden, Germany)
Dr
S Singh
(Institute for Theoretical Physics, Universiteit van Amsterdam, 1090 GL Amsterdam, The Netherlands)
Dr
T Schmitt
(Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland)
Dr
V N Strocov
(Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland)
