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• W2024742432 abstract "We investigate the topological character of lattice chiral Gaussian fermionic states in two dimensions possessing the simplest descriptions in terms of projected entangled pair states (PEPS). They are ground states of two different kinds of Hamiltonians. The first one, ${mathcal{H}}_{mathrm{ff}}$, is local, frustration free, and gapless. It can be interpreted as describing a quantum phase transition between different topological phases. The second one, ${mathcal{H}}_{mathrm{fb}}$, is gapped, and has hopping terms scaling as $1/{r}^{3}$ with the distance $r$. The gap is robust against local perturbations, which allows us to define a Chern number for the PEPS. As for (nonchiral) topological PEPS, the nontrivial topological properties can be traced down to the existence of a symmetry in the virtual modes that are used to build the state. Based on that symmetry, we construct stringlike operators acting on the virtual modes that can be continuously deformed without changing the state. On the torus, the symmetry implies that the ground state space of the local parent Hamiltonian is twofold degenerate. By adding a string wrapping around the torus, one can change one of the ground states into the other. We use the special properties of PEPS to build the boundary theory and show how the symmetry results in the appearance of chiral modes, and a universal correction to the area law for the zero R'enyi entropy." @default.
• W2024742432 created "2016-06-24" @default.
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• W2024742432 date "2014-09-19" @default.
• W2024742432 modified "2023-09-26" @default.
• W2024742432 title "Symmetries and boundary theories for chiral projected entangled pair states" @default.
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• W2024742432 doi "https://doi.org/10.1103/physrevb.90.115133" @default.
• W2024742432 hasPublicationYear "2014" @default.
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