Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.55: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
Thermodynamics of a gauge-frustrated Kitaev spin liquid — •Tim Eschmann1, Petr A. Mishchenko2, Yasuyuki Kato2, Yukitoshi Motome2, and Simon Trebst1 — 1Institute for Theoretical Physics, University of Cologne — 2Department of Applied Physics, University of Tokyo
Kitaev spin models are prototypical frustrated magnets in which the spin degrees of freedom fractionalize and the emergent spin liquid ground state can be described in terms of Majorana fermions coupled to a Z2 gauge field. It is by now well known that varying the underlying lattice structure, these spin liquids can be described as Majorana metals with a topological band structure that includes the formation of Dirac or Weyl nodes, nodal lines, or entire Majorana Fermi surfaces. Here our focus will be on the physics of the concurrently forming Z2 gauge field. Typically, this (static) gauge field orders at low temperatures, with a finite-temperature (inverted Ising) transition occurring in three-dimensional settings. We will discuss an explicit example that goes beyond this paradigmatic situation where the gauge field is found to be subject to geometric frustration, the thermal ordering transition is suppressed, and a residual zero-temperature entropy arises. We discuss a variety of thermodynamic signatures of this physics obtained from large-scale, sign-free quantum Monte Carlo simulations of the underlying Kitaev model.