Finite-size scaling exponents and entanglement in the two-level BCS model

Details Finite-size scaling exponents and entanglement in the two-level BCS model Finite-size scaling exponents and entanglement in the two-level BCS model

2005-01-12

arxiv.org/abs/cond-mat/0501282v2

Phys. Rev. A 71, 060304 (2005)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures, published version

Scientific paper

10.1103/PhysRevA.71.060304

We analyze the finite-size properties of the two-level BCS model. Using the continuous unitary transformation technique, we show that nontrivial scaling exponents arise at the quantum critical point for various observables such as the magnetization or the spin-spin correlation functions. We also discuss the entanglement properties of the ground state through the concurrence which appears to be singular at the transition.

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