Abstract

We describe the algorithmic details and a performance evaluation of a Langevin approach to a strongly interacting electron-phonon system, and show it has a near linear scaling with lattice size N s . Many of the limitations of previous attempts to employ such methods to condensed matter lattice Hamiltonians are absent. In particular, the iterative linear algebra solution remains well behaved at strong coupling and low temperatures. The use of Fourier Acceleration is crucial for efficiency, and its use makes the method competitive with the widely-used local update methods, which scale as \({N}_{s}^{3}\) for on-site interactions and \({N}_{s}^{4}\) for long range electron-phonon coupling, even on rather small lattice sizes.

Details

Title
Quantum Monte Carlo with the Langevin Equation: Coupled Bose-Fermi Systems
Author
Batrouni, G George 1 ; Scalettar, Richard T 2 

 Université Côte d’Azur, INPHYNI, CNRS, 0600 Nice, France; MajuLab, CNRS-UCA-SU-NUS-NTU International Joint Research Unit, 117542 Singapore; Centre for Quantum Technologies, National University of Singapore, 117542 Singapore; Beijing Computational Science Research Center, Beijing 100193, China 
 Department of Physics, University of California, Davis, California 95616, USA 
Publication year
2019
Publication date
Oct 2019
Publisher
IOP Publishing
ISSN
17426588
e-ISSN
17426596
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2567814144
Copyright
© 2019. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.