Quantum phase transition and entanglement in Li atom system
arXiv:0705.0184 · doi:10.1007/s11433-008-0180-9
Abstract
In this paper we study the quantum phase transition and entanglement in s1=1/2 and s2=1 spin pair system by the exact diagonalization method. We show that, for this exactly solvable quantum bi-spin system, entanglement appears before quantum phase transition and disappears after it. Moreover, we show that the von Neumann entropy, as a measure of entanglement, can reveal quantum phase transition in this system.
5 pages, 2 figures
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