Castelnovo, Claudio and Chamon, Claudio (2008) Quantum topological phase transition at the microscopic level. Physical Review B, 77 (5).
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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 local observables.
This is a Submitted version This version's date is: 2/2008 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/fbdf220b-52d4-95d7-6138-efcb6775e23d/2/
Deposited by Research Information System (atira) on 30-May-2012 in Royal Holloway Research Online.Last modified on 30-May-2012