The L\'evy-Rosenzweig-Porter random matrix ensemble

TL;DR

This paper extends the Rosenzweig-Porter model to include broadly distributed off-diagonal elements, providing insights into the multifractal structure of non-ergodic extended states in disordered systems through analytical and numerical methods.

Contribution

It introduces the Le9vy-RP model and develops a simple argument to determine the multifractal structure of states, validated by analytical and numerical analyses.

Findings

Characterizes the phase diagram of the Le9vy-RP ensemble.

Derives fractal dimensions for multifractal wave-functions.

Confirms predictions with exact diagonalizations.

Abstract

In this paper we consider an extension of the Rosenzweig-Porter (RP) model, the L\'evy-RP (L-RP) model, in which the off-diagonal matrix elements are broadly distributed, providing a more realistic benchmark to develop an effective description of non-ergodic extended (NEE) states in interacting many-body disordered systems. We put forward a simple, general, and intuitive argument that allows one to unveil the multifractal structure of the mini-bands in the local spectrum when hybridization is due to anomalously large transition amplitudes in the tails of the distribution. The idea is that the energy spreading of the mini-bands can be determined self-consistently by requiring that the maximum of the matrix elements between a site $i$ and the other $N^{D_1}$ sites of the support set is of the same order of the Thouless energy itself $N^{D_1 - 1}$. This argument yields the fractal dimensions that characterize the statistics of the multifractal wave-functions in the NEE phase, as well as the whole phase diagram of the L-RP ensemble. Its predictions are confirmed both analytically, by a thorough investigation of the self-consistent equation for the local density of states obtained using the cavity approach, and numerically, via extensive exact diagonalizations.