Dresden 2014 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 90: Low-dimensional systems: Topological order (organized by TT)

HL 90.13: Talk

Thursday, April 3, 2014, 13:00–13:15, HSZ 204

Topological entanglement entropy at quantum critical points — •Johannes Helmes and Simon Trebst — Institut für Theoretische Physik, Universität zu Köln, Germany

It is increasingly appreciated that a precise determination of the entanglement entropy of an interacting quantum many-body system can be used to identify the fundamental nature of its ground states. In particular, corrections to the prevalent boundary-law can be used to unambiguously identify topological order -- a non-local form of order that eludes a standard characterization via correlation functions.

Here we report results for the entanglement entropy at a family of quantum critical points separating a topologically ordered phase from a conventionally ordered one. In technical terms, we employ large-scale quantum Monte Carlo simulations to study various deformations of the paradigmatic toric code model harboring a Z2 topological quantum spin liquid.