The absence of the selfaveraging property of the entanglement entropy of disordered free fermions in one dimension

Abstract

We consider the macroscopic system of free lattice fermions in one dimensions assuming that the one-body Hamiltonian of the system is the one dimensional discrete Schrödinger operator with independent identically distributed random potential. We show that the variance of the entanglement entropy of the segment $[-M,M]$ of the system is bounded away from zero as . This manifests the absence of the selfaveraging property of the entanglement entropy in our model, meaning that in the one-dimensional case the complete description of the entanglement entropy is provided by its whole probability distribution. This also may be contrasted the case of dimension two or more, where the variance of the entanglement entropy per unit surface area vanishes as $M\to \infty$ \cite{El-Co:17}, thereby guaranteing the representativity of its mean for large $M$ in the multidimensional case.

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• On the stability of the area law for the entanglement entropy of the Landau Hamiltonian
• Szegö-type Theorems for One-Dimensional Schrodinger Operator with Random Potential (smooth case)
• Entanglement Entropy of Free Fermions with a Random Matrix as a One-Body Hamiltonian