Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 59: Low-Dimensional Systems: Poster Session
TT 59.1: Poster
Mittwoch, 9. März 2016, 15:00–18:30, Poster D
Finite-size effects in spin-gapped metals — •Jonas Greitemann1,3, Stephan Hesselmann1, Stefan Wessel1, Fakher Assaad2, and Martin Hohenadler2 — 1RWTH Aachen, Germany — 2University of Würzburg, Germany — 3LMU Munich, Germany
Attractive backscattering in one-dimensional models is a relevant perturbation to the Tomonaga-Luttinger fixed point, prompting the opening of a spin gap as governed by the Luther-Emery fixed point. We use complementary quantum Monte Carlo approaches to show that this crossover takes place as a function of distance, giving rise to finite-size effects below a scale set by the inverse spin gap. In particular, the finite-size scaling of the staggered charge susceptibility is argued to be unreliable for pinpointing the Peierls transition in the spinful Holstein model.