Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 36: Correlated Electrons: 1D Theory

TT 36.10: Vortrag

Dienstag, 13. März 2018, 12:00–12:15, HFT-FT 101

Spectral flow for an integrable staggered superspin chain — •Konstantin Hobuß and Holger Frahm — Institut für Theoretische Physik, Leibniz Universität Hannover

The flow of the low energy eigenstates of a U_q[sl(2|1)] superspin chain with alternating fundamental (3) and dual (3) representations is studied as function of a twist angle determining the boundary conditions. The finite size spectrum is characterized in terms of scaling dimensions and quasi momenta representing the two families of commuting transfer matrices for the model which are even and odd under the interchange 3↔ 3, respectively. Based on the extrapolation of our finite size data we find that under a variation of the boundary conditions from antiperiodic to periodic for the fermionic degrees of freedom levels from the continuous part of the spectrum flow into discrete levels and vice versa. The implications of our results on the underlying conformal field theory which describes the continuum limit are discussed.