Regensburg 2016 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 50: Correlated Electrons: Frustrated Magnets - Theory

TT 50.8: Talk

Wednesday, March 9, 2016, 17:00–17:15, H18

Phase diagram of frustrated spin ladders with ring exchange interaction — •Alexandros Metavitsiadis¹ and Sebastian Eggert² — ¹Institute for Theoretical Physics, Technical University Braunschweig, Germany — ²Physics Department and Research Center OPTIMAS, Technical University of Kaiserslautern, Germany

The ground state properties of spin ladders are studied, emphasizing the role of frustration. We present a unified field theory calculation for ladders with different geometries and using the renormalization group we deduce their phase diagrams in the presence of in-chain next nearest neighbor interactions as well as plaquette ring exchange interactions. We find the magnetically ordered states, Haldane and rung singlet, in addition to dimerized patterns, columnar dimer and staggered dimer. Lastly, we show that the interplay of the larger unit cell and the ring exchange interaction induces a ferro-antiferromagnetic state, otherwise expected at much higher energy scales.