A pathway towards high throughput Quantum Monte Carlo simulations for alloys: A case study of two-dimensional (2D) GaSₓSe₁₋ₓ
| dc.contributor.author | Wines, Daniel | |
| dc.contributor.author | Saritas, Kayahan | |
| dc.contributor.author | Ataca, Can | |
| dc.date.accessioned | 2021-07-29T13:52:19Z | |
| dc.date.available | 2021-07-29T13:52:19Z | |
| dc.date.issued | 2021-07-13 | |
| dc.description.abstract | The study of alloys using computational methods has been a difficult task due to the usually unknown stoichiometry and local atomic ordering of the different structures experimentally. In order to combat this, first-principles methods have been coupled with statistical methods such as the Cluster Expansion formalism in order to construct the energy hull diagram, which helps to determine if an alloyed structure can exist in nature. Traditionally, density functional theory (DFT) has been used in such workflows. In this work we propose to use chemically accurate many-body variational Monte Carlo (VMC) and diffusion Monte Carlo (DMC) methods to construct the energy hull diagram of an alloy system, due to the fact that such methods have a weaker dependence on the starting wavefunction and density functional, scale similarly to DFT with the number of electrons, and have had demonstrated success for a variety of materials. To carry out these simulations in a high-throughput manner, we propose a method called Jastrow sharing, which involves recycling the optimized Jastrow parameters between alloys with different stoichiometries. We show that this eliminates the need for extra VMC Jastrow optimization calculations and results in a significant computational cost savings (on average 1/4 savings of total computational time). Since it is a novel post-transition metal chalcogenide alloy series that has been synthesized in its few-layer form, we used monolayer GaSₓSe₁₋ₓ as a case study for our workflow. By extensively testing our Jastrow sharing procedure for monolayer GaSₓSe₁₋ₓ and quantifying the cost savings, we demonstrate how a pathway towards chemically accurate high-throughput simulations of alloys can be achieved using many-body VMC and DMC methods. | en_US |
| dc.description.sponsorship | This work was supported by the National Science Foundation through the Division of Materials Research under NSF DMR-1726213. | en_US |
| dc.description.uri | https://arxiv.org/abs/2107.06128 | en_US |
| dc.format.extent | 25 pages | en_US |
| dc.genre | journal articles preprints | en_US |
| dc.identifier | doi:10.13016/m2uvjo-qhhm | |
| dc.identifier.uri | http://hdl.handle.net/11603/22210 | |
| dc.language.iso | en_US | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Physics Department Collection | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.relation.ispartof | UMBC Student Collection | |
| dc.rights | This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author. | |
| dc.rights | Attribution 4.0 International (CC BY 4.0) | * |
| dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | * |
| dc.title | A pathway towards high throughput Quantum Monte Carlo simulations for alloys: A case study of two-dimensional (2D) GaSₓSe₁₋ₓ | en_US |
| dc.type | Text | en_US |