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Paper Abstract and Keywords
Presentation 2014-03-18 13:00
Model selection of NiGa_2S_4 triangular lattice by Bayesian estimation
Hikaru Takenaka, Kenji Nagata, Takashi Mizokawa (Univ. of Tokyo), Masato Okada (Univ. of Tokyo/RIKEN)
Abstract (in Japanese) (See Japanese page) 
(in English) The superexchange interaction, which favors parallel or anti-parallel alignment of electron spins in magnets, has an important role, and it is very essential to select an effective model where the superexchange interaction is optimized.
We propose a novel method for abstracting effective superexchange interaction parameters from calculated data of the electronic state by Bayesian estimation.
In Bayesian estimation, the origin behind phenomena could be estimated from data by minimizing the posterior expected value of a loss function.
The method used for abstracting effective parameters is called the model selection in statistical mechanics.
We apply the method for the NiGa$_2$S$_4$ triangular-lattice where the ground states is a spin disordered state.
The triangular lattice is the simplest frustrated spin system in two-dimensional structures.
As a result, we estimated that not only the superexchange interaction between the third-nearest neighbor-sites, known as a dominant interaction in NiGa$_2$S$_4$, but also those between the nearest and the second-nearest neighbor-sites should be considered.
Keyword (in Japanese) (See Japanese page) 
(in English) Bayesian estimation / model selection / strongly correlated electron system / frustration / / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 500, NC2013-107, pp. 109-114, March 2014.
Paper # NC2013-107 
Date of Issue 2014-03-10 (NC) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Committee NC MBE  
Conference Date 2014-03-17 - 2014-03-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Tamagawa University 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To NC 
Conference Code 2014-03-NC-MBE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Model selection of NiGa_2S_4 triangular lattice by Bayesian estimation 
Sub Title (in English)  
Keyword(1) Bayesian estimation  
Keyword(2) model selection  
Keyword(3) strongly correlated electron system  
Keyword(4) frustration  
1st Author's Name Hikaru Takenaka  
1st Author's Affiliation University of Tokyo (Univ. of Tokyo)
2nd Author's Name Kenji Nagata  
2nd Author's Affiliation University of Tokyo (Univ. of Tokyo)
3rd Author's Name Takashi Mizokawa  
3rd Author's Affiliation University of Tokyo (Univ. of Tokyo)
4th Author's Name Masato Okada  
4th Author's Affiliation University of Tokyo/RIKEN (Univ. of Tokyo/RIKEN)
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Date Time 2014-03-18 13:00:00 
Presentation Time 20 
Registration for NC 
Paper # IEICE-NC2013-107 
Volume (vol) IEICE-113 
Number (no) no.500 
Page pp.109-114 
#Pages IEICE-6 
Date of Issue IEICE-NC-2014-03-10 

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