Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Poster

TT 37.19: Poster

Wednesday, March 19, 2025, 15:00–18:00, P4

Chiral spin liquid in external magnetic field: Phase diagram of the decorated-honeycomb Kitaev model — •Sabastian Granberg Cauchi and Matthias Vojta — TU Dresden, Germany

Studies of Kitaev models on different lattices have shown signatures of topological phase transitions as a function of external magnetic field direction and magnitude. These transitions are often accompanied by a change in the statistics of the low-energy anyonic excitations. In particular, the antiferromagnetic Kitaev system yields a field-induced spin liquid, of arguably gapless U(1) or Abelian character. The existence of field-induced spin liquids on different lattices has consequently been intensely investigated. Here, we determine the phase diagram of the decorated-honeycomb Kitaev model for different inter- and intra-triangle coupling ratios and magnetic fields using a mean-field theory derived from Kitaev's Majorana parton decomposition.

Keywords: Kitaev interaction; Chiral spin liquid; Magnetic field