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TT: Fachverband Tiefe Temperaturen

TT 1: Correlated Electrons: Low-dimensional Systems - Models 1

TT 1.6: Vortrag

Montag, 26. März 2012, 10:45–11:00, H 0104

Fractionalization of electron’s spin and orbital degrees of freedom in 1D — •Krzysztof Wohlfeld¹, Maria Daghofer¹, Satoshi Nishimoto¹, Giniyat Khaliullin², and Jeroen van den Brink¹ — ¹IFW Dresden, Germany — ²MPI-FKF Stuttgart, Germany

We show that electron’s spin and orbital degrees of freedom can fractionalize in 1D antiferromagnets: although the orbital excitations are inherently coupled to spinons in antiferromagnetic Mott insulators, in 1D they separate into a pure orbiton and a single spinon. This is similar to the spin-charge separation in 1D but corresponds to an exotic regime where spinons are faster than holons [1]. The resulting large dispersion of the pure orbiton can be detected in e.g. quasi-1D cuprates [2].
K. Wohlfeld, M. Daghofer, S. Nishimoto, G. Khaliullin, and J. van den Brink, Phys. Rev. Lett. 107, 147201 (2011).
J. Schlappa et al., to be published (2011).