Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 16: Correlated Electrons: Low-dimensional Systems - Models 2
TT 16.10: Vortrag
Dienstag, 27. März 2012, 12:00–12:15, H 0104
Phase diagram of the bilinear-biquadratic-bicubic spin 3/2 chain — •Stephan Rachel1 and Andreas M. Läuchli2 — 1Department of Physics, Yale University, New Haven, CT 06520, USA — 2Institut für Theoretische Physik, Universität Innsbruck, A-6020 Innsbruck, Austria
The most general spin 3/2 chain with SU(2) invariant nearest neighbor interactions is investigated. Using exact diagonalization and density matrix renormalization group the corresponding phase diagram is explored. It hosts a plethora of phases. Besides the critical and ferromagnetic phases containing the usual Heisenberg models, we find dimerized, partial ferromagnetic, and a period-4 phase with enhanced SU(4) symmetry. Furthermore, in the vicinity of the antiferromagnetic Heisenberg point we identify a period-6 phase.