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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.42: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

Dynamics of a triangular spin-ladder with ring exchange — •Jonas Richter and Wolfram Brenig — Institute for Theoretical Physics, Technical University Braunschweig, Germany

Ring exchange processes which become non-negligible in weak Mott insulators, typically enhance magnetic frustration and may lead to novel physics. Using linear response theory, we study the finite temperature spin and current dynamics of a triangular two-leg spin ladder with additional four-spin ring exchange which can potentially be viewed as a one-dimensional descendent of the organic Mott insulator κ-(ET)₂Cu₂(CN)₃. Employing complementary numerical methods, namely exact diagonalization, the Lanczos algorithm and dynamical quantum typicality, we present results for the static and dynamic structure factor, spin and energy conductivities and their corresponding Drude weights. We explore the relevant parameter space, both into the spin-Peierls as well as into the putative spin-Bose metal phase and uncover unique features in the spin dynamics which are not present for nearest-neighbor Heisenberg exchange only.