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Entanglement spectrum of a topological phase in one dimension
Frank Pollmann, Erez Berg, Ari M. Turner +1
We show that the Haldane phase of S=1 chains is characterized by a double degeneracy of the entanglement spectrum. The degeneracy is protected by a set of symmetries (either the di…
Symmetry protection of topological order in one-dimensional quantum spin systems
Frank Pollmann, Erez Berg, Ari M. Turner +1
We discuss the characterization and stability of the Haldane phase in integer spin chains on the basis of simple, physical arguments. We find that an odd- Haldane phase is a top…
Charge superconductivity from pair density wave order in certain high temperature superconductors
E. Berg, E. Fradkin, S. A. Kivelson
A number of spectacular experimental anomalies\cite{li-2007,fujita-2005} have recently been discovered in certain cuprates, notably {\LBCO} and {\LNSCO}, which exhibit unidirection…