# Hydrogen bond correlated percolation in a supercooled water monolayer as a hallmark of the critical region

## TL;DR

This study models supercooled water monolayers, revealing that hydrogen bond percolation correlates with the liquid-liquid phase transition and critical point, providing insights into the thermodynamics of supercooled water.

## Contribution

It introduces a theoretical model mapping supercooled water monolayers onto a percolation problem, linking hydrogen bond clusters to phase transition phenomena.

## Key findings

- Percolation line coincides with the liquid-liquid phase transition.
- Percolation corresponds to maxima of thermodynamic response functions.
- A positive slope percolation transition is observed at higher pressures.

## Abstract

Numerical simulations for a number of water models have supported the possibility of a metastable liquid-liquid critical point (LLCP) in the deep super-cooled region. Here we consider a theoretical model for a supercooled liquid water monolayer and its mathematical mapping onto a percolation problem. The mapping allows us to identify the finite-size clusters at any state-point, and the infinite cluster at the critical point, with the regions of correlated hydrogen bonds (HBs). We show that the percolation line coincides with the first-order liquid-liquid phase transition ending at the LLCP. At pressures below the LLCP, the percolation line corresponds to the strong maxima of the thermodynamic response functions and to the locus of maximum correlation length (Widom line). At higher pressures, we find a percolation transition with a positive slope and we discuss its possible relation with the thermodynamics.