A quantum topological phase transition at the microscopic level

Details A quantum topological phase transition at the microscopic level A quantum topological phase transition at the microscopic level

2007-07-13

arxiv.org/abs/0707.2084v3

Phys. Rev. B 77, 054433 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

(13 pages, 4 figures) v2: updated references and acknowledgments; v3: final update (references) after publication

Scientific paper

10.1103/PhysRevB.77.054433

We study a quantum phase transition between a phase which is topologically ordered and one which is not. We focus on a spin model, an extension of the toric code, for which we obtain the exact ground state for all values of the coupling constant that takes the system across the phase transition. We compute the entanglement and the topological entropy of the system as a function of this coupling constant, and show that the topological entropy remains constant all the way up to the critical point, and jumps to zero beyond it. Despite the jump in the topological entropy, the transition is second order as detected via any local observable.

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