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arXiv · 2203.06708

Universal Thermal Corrections to Symmetry-Resolved Entanglement Entropy and Full Counting Statistics

Mostafa Ghasemi
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Abstract

We consider the symmetry-resolved Rényi and entanglement entropies for two-dimensional conformal field theories on a circle at nonzero temperature. We assume a unique ground state with a nonzero mass gap induced by the system's finite size and then calculate the leading corrections to the contributions of individual charge sectors in a low-temperature expansion. Besides the size of the mass gap and the degeneracy of the first excited state, these universal corrections depend only on the four-point correlation function of the primary fields. We also obtain thermal corrections to the full counting statistics of the ground state and define the \textit{probability fluctuations} function. It scales as $e^{-2 πΔ_ψ β/L}$, where $Δ_ψ$ is the scaling dimension of the lowest weight states. As an example, we explicitly evaluate the thermal corrections to the symmetry-resolved entanglement entropy and FCS for the spinless fermions.

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BibTeXRIS

Mostafa Ghasemi. 2022-10-12. Universal Thermal Corrections to Symmetry-Resolved Entanglement Entropy and Full Counting Statistics. https://doi.org/10.1007/jhep05(2023)209

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