Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 109: Frustrated Magnets - (General) Theory
TT 109.1: Talk
Friday, March 16, 2018, 09:30–09:45, H 3005
The frustrated bilayer honeycomb antiferromagnet — •Wolfram Brenig1, Marcelo Arlego2, Carlos Lamas2, and Hao Zhang3 — 1Institute for Theoretical Physics, Technical University Braunschweig, Germany — 2IFLP - CONICET, Departamento de Física, Universidad Nacional de La Plata, Argentina — 3National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China
We analalyze the spin-1/2 Heisenberg antiferromagnet on the honeycomb bilayer with frustrating next-nearest neighbor exchange. Using a combination of bond-operators, Schwinger-boson mean field theory, and dimer series expansion, we show that the competition between intra- and interlayer coupling gives rise to a rich variety of semiclassical and genuinely quantum phases. Results for ground state energies, excitation gaps, and spin-spin correlation functions will be discussed. In particular we provide new evidence for the existence of a quantum disordered lattice-nematic phase within a substantial range of intermediate intralayer frustration and interlayer coupling.