Entanglement spectra of quantum Heisenberg ladders

Details Entanglement spectra of quantum Heisenberg ladders Entanglement spectra of quantum Heisenberg ladders

2010-05-12

arxiv.org/abs/1005.2123v5

Phys. Rev. Lett. 105, 077202 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

Revised version, 9 pages, 7 figures. "Supplementary material" showing additional results for **frustrated** ladders

Scientific paper

10.1103/PhysRevLett.105.077202

Bipartite entanglement measures are fantastic tools to investigate quantum phases of correlated electrons. Here, I analyze the entanglement spectrum of **gapped** two-leg quantum Heisenberg ladders on a periodic ribbon partitioned into two identical periodic chains. Comparison of various entanglement entropies proposed in the literature is given. The entanglement spectrum is shown to closely reflect the low-energy gapless spectrum of each individual edge, for any sign of the exchange coupling constants. This extends the conjecture initially drawn for Fractional Quantum Hall systems to the field of quantum magnetism, stating a direct correspondence between the low-energy entanglement spectrum of a partitioned system and the true spectrum of the "virtual edges". A mapping of the reduced density matrix to a thermodynamic density matrix is also proposed via the introduction of an effective temperature.

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