scholarly journals Renormalization of the band gap in 2D materials through the competition between electromagnetic and four-fermion interactions in large N expansion

2020 ◽  
Vol 102 (1) ◽  
Author(s):  
Luis Fernández ◽  
Van Sérgio Alves ◽  
Leandro O. Nascimento ◽  
Francisco Peña ◽  
M. Gomes ◽  
...  
Keyword(s):  
Band Gap ◽  
2D Materials ◽  
Large N ◽  
Large N Expansion

Efficient Prediction of Structural and Electronic Properties of Hybrid 2D Materials Using DFT and Machine Learning

2018 ◽  
Author(s):  
Sherif Tawfik ◽  
Olexandr Isayev ◽  
Catherine Stampfl ◽  
Joseph Shapter ◽  
David Winkler ◽  
...  
Keyword(s):  
Machine Learning ◽  
Band Gap ◽  
Density Functional ◽  
2D Materials ◽  
Van Der Waals ◽  
Building Blocks ◽  
Machine Learning Techniques ◽  
Interlayer Distance ◽  
Computational Screening ◽  
Wide Range

Materials constructed from different van der Waals two-dimensional (2D) heterostructures offer a wide range of benefits, but these systems have been little studied because of their experimental and computational complextiy, and because of the very large number of possible combinations of 2D building blocks. The simulation of the interface between two different 2D materials is computationally challenging due to the lattice mismatch problem, which sometimes necessitates the creation of very large simulation cells for performing density-functional theory (DFT) calculations. Here we use a combination of DFT, linear regression and machine learning techniques in order to rapidly determine the interlayer distance between two different 2D heterostructures that are stacked in a bilayer heterostructure, as well as the band gap of the bilayer. Our work provides an excellent proof of concept by quickly and accurately predicting a structural property (the interlayer distance) and an electronic property (the band gap) for a large number of hybrid 2D materials. This work paves the way for rapid computational screening of the vast parameter space of van der Waals heterostructures to identify new hybrid materials with useful and interesting properties.

scholarly journals A large N expansion for gravity

2005 ◽  
Vol 731 (3) ◽  
pp. 389-405 ◽  
Author(s):  
F. Canfora
Keyword(s):  
Large N ◽  
Large N Expansion
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