期刊
JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
卷 37, 期 2, 页码 291-302出版社
IOP PUBLISHING LTD
DOI: 10.1088/0305-4470/37/2/001
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We calculate exactly matrix elements between non-equilibrium excitations of the quantum XY model for general anisotropy. These matrix elements are expressed as a sum of Pfaffians. For single particle excitations on the ground state, the Pfaffians in the sum simplify to determinants.
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