# Crystallization of the Transdimensional Electron Liquid

## TL;DR

This paper explores how free electrons can form a crystal at room temperature in ultrathin materials, leading to a supersolid state with unique properties.

## Contribution

The study introduces a new class of ultrathin materials where Wigner crystallization of electrons occurs at room temperature.

## Key findings

- Reducing material thickness enables Wigner crystallization of free electrons at room temperature.
- The crystalline state forms a two-dimensional triangular lattice inside the material.
- The resistivity of the material behaves contrary to free electron gas model predictions.

## Abstract

Wigner crystallization
of free electrons at room temperature
has
been explored theoretically for a new class of metallic ultrathin
(transdimensional) materials whose properties can be controlled by
their thickness. Our calculations of the melting surface, critical
electron density and temperature explain consistently the experimental
data reported previously. We show that by reducing the material thickness
one can Wigner-crystallize free electrons at room temperature to get
them pinned onto a two-dimensional triangular lattice of a supersolid
inside of the crystalline material. Such a solid melts and freezes
reversibly with increase and decrease of electron doping or temperature,
whereby its resistivity behaves opposite to the free electron gas
model predictions.