Sang Wook Kim, Mohamed Elsayed, Taras Lakoba, Juan Vanegas, Valeri Kotov, Adrian Del Maestro
Bosonic atoms deposited on atomically thin substrates represent a playground for exotic quantum many-body physics due to the highly-tunable, atomic-scale nature of the interaction potentials. The ability to engineer strong interparticle interactions can lead to the emergence of complex collective atomic states of matter, not possible in the context of dilute Bose gases confined by optical lattices. While it is known that the first layer of adsorbed helium on graphene is permanently locked into a solid phase, we show by a combination of quantum Monte Carlo and mean-field techniques, that simple isotropic (graphene) lattice expansion effectively unlocks a large variety of two-dimensional ordered commensurate, incommensurate, cluster atomic solid, and superfluid states for adsorbed atoms. It is especially significant that an atomically thin superfluid phase of matter emerges under experimentally feasible strain values, with potentially supersolid phases in close proximity on the phase diagram.
This repository includes links, code, scripts, and data to generate the figures in a paper.
The data in this project was generated via path integral Monte Carlo (PIMC) simulation. You can find the source code for PIMC on https://github.com/DelMaestroGroup/pimc and raw data on Zenodo
Python notebooks and modules for analysis are in the src (See README.md in the directory), and data you need is in the data directory
- Dependency: See ./src/README.md.
You can also install a minimal environment via: pip install -r requirements.txt
This work was supported by NASA grant number 80NSSC19M0143.
Figure 05: Mean-field phase diagram in physical units driven from Hartree-Fock based model parameters
This figures are relesed under CC BY-SA 4.0 and can be freely copied, redistributed and remixed.