Regensburg 2013 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 14: Correlated Electrons: Low-Dimensional Systems - Models 2
TT 14.1: Talk
Monday, March 11, 2013, 15:00–15:15, H9
Topological parity invariant in interacting two-dimensional systems from quantum Monte Carlo — •Stefan Wessel1, Thomas Lang1, Victor Gurarie2, and Andrew Essin2 — 1RWTH Aachen, Aachen, Germany — 2University of Colorado, Boulder, USA
We report results on calculating the parity invariant from imaginary-time Green's functions in quantum Monte Carlo simulations of strongly interacting electron systems. The topological invariant is used to study the trivial- to topological-insulator transitions in the Kane-Mele-Hubbard model with an explicit bond dimerization. We explore the accessibility and behavior of this invariant based on quantum Monte Carlo calculations.