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  • Letter

Universal entanglement signatures of interface conformal field theories

Qicheng Tang1,2,*, Zixia Wei3,4,*, Yin Tang1,2, Xueda Wen5,6, and W. Zhu1,2,†

  • 1Department of Physics, School of Science, Westlake University, Hangzhou 310030, China
  • 2Institute of Natural Sciences, Westlake Institute for Advanced Study, Hangzhou 310024, China
  • 3Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
  • 4Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS), RIKEN, Wako 351-0198, Japan
  • 5Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
  • 6Department of Physics, University of Colorado, Boulder, Colorado 80309, USA

  • *These authors contributed equally to this work.
  • †zhuwei@westlake.edu.cn
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Phys. Rev. B 109, L041104 – Published 8 January, 2024

DOI: https://doi.org/10.1103/PhysRevB.109.L041104

Abstract

An interface connecting two distinct conformal field theories hosts rich critical behaviors. In this paper, we investigate the entanglement properties of such critical interface theories for probing the underlying universality. As inspired by holographic perspectives, we demonstrate vital features of various entanglement measures regarding such interfaces based on several paradigmatic lattice models. Crucially, for two subsystems adjacent at the interface, the mutual information and the reflected entropy exhibit identical leading logarithmic scaling, giving an effective interface central charge that takes the same value as the smaller central charge of the two conformal field theories. Our paper demonstrates that the entanglement measure offers a powerful tool to explore the rich physics in critical interface theories.

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Phys. Rev. B 109, L041104– Published 8 January, 2024
  • Received 18 August 2023
  • Revised 27 November 2023
  • Accepted 13 December 2023
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