Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Correlated Electrons: Spin Systems and Itinerant Magnets – Frustrated Magnets 1 (jointly with MA)
TT 5.3: Vortrag
Montag, 16. März 2015, 10:00–10:15, H 0110
Quantum phases of the frustrated Heisenberg model on the bilayer honeycomb lattice — •Wolfram Brenig1, Marcelo Arlego2, and Carlos Lamas2 — 1Institute for Theoretical Physics, Technical University Braunschweig, Germany — 2IFLP - CONICET, Departamento de Física, Universidad Nacional de La Plata, Argentina
We analalyze the spin-1/2 Heisenberg antiferromagnet on the honeycomb bilayer with frustrateing next-nearest neighbor exchange. Using a combination of bond-operators, Schwinger-boson mean field theory, and dimer series expansion we evaluate and compare results for the magnetic quantum phase diagram as a function of the intra(inter) planar couplings J1,2(J⊥). Evidence for both, magnetically ordered and disordered phases will be presented from results for the ground state energy, the spin gap, and real space spin-spin correlation functions. The presence of Néel, dimer, nematic, and non-collinear states will be discussed.