Quantum phase transition and entanglement in Li atom system

Details Quantum phase transition and entanglement in Li atom system Quantum phase transition and entanglement in Li atom system

2007-05-01

arxiv.org/abs/0705.0184v2

Science in China Series G: Physics, Mechanics & Astronomy, 2008, Vol. 51, No. 11, pp: 1677-1681

Physics

Quantum Physics

5 pages, 2 figures

Scientific paper

10.1007/s11433-008-0180-9

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.

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