Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.38: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

Disordered Weyl spin liquids — •Kevin O’Brien, Maria Hermanns, and Simon Trebst — Universität zu Köln

Electronic Weyl semimetals have garnered considerable attention since their recent observation in TaAs and photonic materials. Here we investigate the spin analogue of the electronic Weyl semimetal – the Weyl spin liquid.

Such a state can be readily found in generalizations of the Kitaev honeycomb model on certain three-dimensional tricoorinated lattices. In these Weyl spin liquids, the original spin-1/2 moments form a quantum spin liquid wherein they fractionalize into gapped flux excitations of a Z2 gauge field as well as into Majorana fermions which form the gapless Weyl dispersion. One unusual aspect of the Weyl spin liquid is that it may appear under symmetry conditions which would forbid the formation of its conventional electronic counterpart, namely, with both time-reversal and inversion symmetry intact.

In this work we discuss some general properties of Weyl spin liquids as well as the impact of disorder. In particular, we investigate the effects of short- and long-range correlated disorder on the low-energy physics of these systems, and to what extent disorder is sensitive to the underlying symmetry class.