Quantum entanglement in the multicritical disordered Ising model

István A. Kovács*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Quantum entanglement at critical points is often marked by universal characteristics. Here, the entanglement entropy is calculated at the quantum multicritical point of the random transverse-field Ising model (RTIM). We use an efficient implementation of the strong disorder renormalization group method in two and three dimensions for two types of disorder. For cubic subsystems we find a universal logarithmic corner contribution to the area law bln(ℓ) that is independent of the form of disorder. Our results agree qualitatively with those at the quantum critical points of the RTIM, but with new b prefactors due to having both geometric and quantum fluctuations at play. By studying the vicinity of the multicritical point, we demonstrate that the corner contribution serves as an "entanglement susceptibility,"a useful tool to locate the phase transition and to measure the correlation length critical exponents.

Original languageEnglish (US)
Article number214202
JournalPhysical Review B
Volume109
Issue number21
DOIs
StatePublished - Jun 1 2024

Funding

This work was supported by the National Science Foundation under Grant No. PHY-2310706 of the QIS program in the Division of Physics.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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