Topological phases and topological entropy of two-dimensional systems with finite correlation length
- Department of Physics, University of Illinois at Urbana-Champaign, 1110 W. Green St., Urbana, Illinois 61801-3080 (United States)
- Department of Physics and Astronomy, University of California at Riverside, Riverside, California 92521 (United States)
We elucidate the topological features of the entanglement entropy of a region in two-dimensional quantum systems in a topological phase with a finite correlation length {xi}. First, we suggest that simpler reduced quantities, related to the von Neumann entropy, could be defined to compute the topological entropy. We use our methods to compute the entanglement entropy for the ground-state wave function of a quantum eight-vertex model in its topological phase and show that a finite correlation length adds corrections of the same order as the topological entropy which come from sharp features of the boundary of the region under study. We also calculate the topological entropy for the ground state of the quantum dimer model on a triangular lattice by using a mapping to a loop model. The topological entropy of the state is determined by loop configurations with a nontrivial winding number around the region under study. Finally, we consider extensions of the Kitaev wave function, which incorporate the effects of electric and magnetic charge fluctuations, and use it to investigate the stability of the topological phase by calculating the topological entropy.
- OSTI ID:
- 21052815
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 76, Issue 22; Other Information: DOI: 10.1103/PhysRevB.76.224421; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
Similar Records
Entanglement and topological entropy of the toric code at finite temperature
Entanglement entropy between two coupled Tomonaga-Luttinger liquids