Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Poster Session: Correlated Electrons 1
TT 19.19: Poster
Montag, 20. März 2017, 15:00–19:00, P2-EG
Competing phases in spin ladders with ring exchange and frustration — •Alexandros Metavitsiadis1 and Sebastian Eggert2 — 1Institute for Theoretical Physics Technical University Braunschweig, Braunschweig, Germany — 2Department of Physics and OPTIMAS Research Center, University of Kaiserslautern, Kaiserslautern, Germany
The ground state properties of spin-1/2 ladders are studied, emphasizing the role of frustration and ring exchange coupling. We present a unified field theory for ladders with general coupling constants and geometry. Rich phase diagrams can be deduced by using a renormalization group calculation for ladders with in chain next nearest neighbor interactions and plaquette ring exchange coupling. In addition to established phases such as Haldane, rung singlet, and dimerized phases, we also observe a surprising instability towards an incommensurate phase for weak interchain couplings, which is characterized by an exotic coexistence of self-consistent ferromagnetic and anti-ferromagnetic order parameters.