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The boundary correlation function of fixed-to-free boundary-condition-changing operators in a square-lattice Ising model

Seung-Yeop Lee

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We study the boundary correlation function of the fixed-to-free boundary-condition-changing (bcc) operators in the square-lattice Ising model. First, we find a formula for representing a large class of two-point boundary correlation functions using a 2 × 2 block Toeplitz determinant. Using this formula the correlation function of the fixed-to-free bcc operator is represented using block Toeplitz determinants, for arbitrary, uniformly anisotropic couplings. This block Toeplitz determinant is transformed into a scalar Toeplitz determinant when the size of the matrix is an even number. We use Szegö's theorem and the Fisher–Hartwig theorem to identify the asymptotic behavior of this scalar Toeplitz determinant.


Keywords

solvable lattice models

rigorous results in statistical mechanics

correlation functions

PACS

05.50.+q Lattice theory and statistics (Ising, Potts, etc.)

02.10.Ud Linear algebra

02.30.Tb Operator theory

MSC

47B35 Toeplitz operators, Hankel operators, Wiener-Hopf operators (See also 45P05, 47G10 for other integral operators; see also 32A25, 32M15)

82B20 Lattice systems (Ising, dimer, Potts, etc.) and systems on graphs

47L80 Algebras of specific types of operators (Toeplitz, integral, pseudodifferential, etc.)

15A15 Determinants, permanents, other special matrix functions (See also 19B10, 19B14)

Subjects

Mathematical physics

Statistical physics and nonlinear systems

Dates

Issue 10 (October 2007)

Received 23 August 2007, accepted for publication 28 September 2007

Published 22 October 2007



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