Finite-size spectrum of the staggered six-vertex model with antidiagonal boundary conditions

authored by

Holger Frahm, Sascha Gehrmann

Abstract

The finite-size spectrum of the critical staggered six-vertex model with antidiagonal boundary conditions is studied. Similar to the case of periodic boundary conditions, we identify three different phases. In two of those, the underlying conformal field theory can be identified to be related to the twisted \(U(1)\) Kac-Moody algebra. In contrast, the finite size scaling in the third regime, whose critical behaviour with the quasi-periodic BCs is described by the \(SL(2,\mathbb{R})_k/U(1)\) black hole CFT possessing a non-compact degree of freedom, is more subtle. Here with antidiagonal BCs imposed, the corrections to the scaling of the ground state grow logarithmically with the system size, while the energy gaps appear to close logarithmically. Moreover, we obtain an explicit formula for the Q-operator which is useful for numerical implementation.

Organisation(s)

Institute of Theoretical Physics

Type

Preprint

No. of pages

20

Publication date

31.05.2024

Publication status

E-pub ahead of print

Electronic version(s)

https://arxiv.org/abs/2405.20919 (Access: Open)