 0734 Walter H. Aschbacher
 On the emptiness formation probability in quasifree states
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Feb 13, 07

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Abstract. We study the behavior of the emptiness formation probability for large spin strings in translation invariant quasifree states on the CAR algebra on the discrete line and establish a simple criterion on the oneparticle density matrix of the quasifree state which ensures exponential decay. As an illustration, we treat the example of the XY spin chain out of equilibrium, in thermal equilibrium, in the ground state, and in the chaotic state.
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