Emptiness formation probability, Toeplitz determinants, and conformal field theory

作者: Jean-Marie Stéphan

DOI: 10.1088/1742-5468/2014/05/P05010

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摘要: We revisit the study of emptiness formation probability, probability forming a sequence $\ell$ spins with same ferromagnetic orientation in ground-state quantum spin chain. focus on two different examples, exhibiting strikingly behavior: XXZ and Ising chains. One has conserved number particles, other does not. In latter we show that fixed can be viewed as an additional boundary imaginary time. then use conformal field theory (CFT) techniques to derive all universal terms its scaling, provide checks free fermionic systems. These are based numerical simulations or, when possible, mathematical results asymptotic behavior Toeplitz Toeplitz+Hankel determinants. A perturbed CFT analysis uncovers interesting $\ell^{-1}\log \ell$ correction, also appears closely related full counting statistics. The case turns out more challenging, scale invariance is broken. simple qualitative picture which freezes degrees freedom inside certain "arctic" region, determine numerically. evidence for existence logarithmic terms, generated by massless living outside arctic region.

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