# Léo REGNIER & Adriano ANGELONE

## Description

**- Léo REGNIER :** Complete visitation statistics of one-dimensional random walks

*Doctorant en 2ème année, sous la supervision d'Olivier Bénichou*

**- Adriano ANGELONE :** Disorder-free quantum glasses in quasicrystalline lattices

*Post-doctorant*

Quasicrystals, ordered but not periodic structures, have been originally discovered in the context of solid state physics, and have since inspired considerable research efforts thanks to their peculiar geometric properties. Their experimental realization in photonic systems and cold atom setups has generated further interest, resulting in many studies investigating the properties of interacting quantum particles moving in quasicrystalline lattice structures. One of the most interesting results of these works has been the discovery of Bose Glass (BG) states, globally localized but displaying local patches of delocalized particles. In all of these studies, however, the quasicrystalline substrates were accompanied by disorder, to closely model cold atom experimental platforms; this leaves open the question as to if and how the typical phase diagram of these systems changes in the disorder-free case.

In this talk, I will discuss recent results by my co-workers and I on a system of particles interacting via finite-range interactions on a disorder-free quasicrystalline lattice. Using numerically exact Path Integral Monte Carlo simulations, we obtain the first approximation-free phase diagram of a model in this setting, confirming the existence of a BG phase in the absence of disorder (at odds with previous mean-field predictions). Our results are of great interest given the perspective of laboratory engineering of disorder-free quasicrystalline systems via photonic experiments.