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TT: Fachverband Tiefe Temperaturen

TT 24: Low-Dimensional Systems: 1D - Theory

TT 24.11: Vortrag

Dienstag, 21. März 2017, 12:15–12:30, HSZ 204

Microscopic Analysis of 1D Lattice Models for Synthetic Helical Liquids — •Lorenzo Pastori and Jan Carl Budich — Department of Physics, University of Gothenburg, SE 412 96 Gothenburg, Sweden

Helical liquids exhibiting spin-momentum locking are known to appear at the edges of 2D time-reversal invariant topological insulators. Here we investigate various Fermi-Hubbard models for 1D lattice systems where synthetic helical liquids can be realised. In such models the low-energy physics around the Fermi points can be described in terms of emergent helical Luttinger liquid behaviour. Using density matrix renormalisation group techniques, we quantitatively analyse the presence of spin-momentum locking, i.e. the key hallmark of helical liquids, by studying ground state spin-spin correlation functions.