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cond-mat.str-el2015★ 43 cited
Symmetry-protected Topological Phases at Finite Temperature
O. Viyuela, A. Rivas, M. A. Martin-Delgado
We have applied the recently developed theory of topological Uhlmann numbers to a representative model of a topological insulator in two dimensions, the Qi-Wu-Zhang model. We have…
cond-mat.str-el2014★ 115 cited
Two-Dimensional Density-Matrix Topological Fermionic Phases: Topological Uhlmann Numbers
O. Viyuela, A. Rivas, M. A. Martin-Delgado
We construct a topological invariant that classifies density matrices of symmetry-protected topological orders in two-dimensional fermionic systems. As it is constructed out of the…