Monday, December 10, 2012

1104.1331 (G. De Chiara et al.)

Entanglement Spectrum, Critical Exponents and Order Parameters in
Quantum Spin Chains
   [PDF]

G. De Chiara, L. Lepori, M. Lewenstein, A. Sanpera
We investigate the entanglement spectrum near criticality in finite quantum spin chains. Using finite size scaling we show that when approaching a quantum phase transition, the Schmidt gap, i.e., the difference between the two largest eigenvalues of the reduced density matrix, signals the critical point and scales with universal critical exponents related to the relevant operators of the corresponding perturbed conformal field theory describing the critical point. Such scaling behavior allows us to identify explicitly the Schmidt gap as a local order parameter.
View original: http://arxiv.org/abs/1104.1331

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