Variational Monte Carlo study for the insulating mechanism of Sr 2IrO4

From the viewpoint of energy gain

Hiroshi Watanabe, Tomonori Shirakawa, Seiji Yunoki

Research output: Contribution to journalArticle

Abstract

To examine the insulating mechanism of a novel 5d-electron system Sr 2IrO4, we study the ground state properties of a three-orbital Hubbard model using a variational Monte Carlo method. We find that the insulating state in the ground state phase diagram shows crossover behavior from a weakly-correlated to a strongly-correlated antiferromagnetic state. This crossover is characterized by the different mechanisms of the insulating state, i.e., changing from an interaction-energy driven insulator to a band-energy driven insulator with increasing the interaction. We discuss that Sr 2IrO4 is located around this crossover region and displays an anomalous behavior.

Original languageEnglish
Article number012047
JournalJournal of Physics: Conference Series
Volume454
Issue number1
DOIs
Publication statusPublished - 2013
Externally publishedYes

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crossovers
insulators
ground state
energy bands
Monte Carlo method
energy
phase diagrams
interactions
orbitals
electrons

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Variational Monte Carlo study for the insulating mechanism of Sr 2IrO4 : From the viewpoint of energy gain. / Watanabe, Hiroshi; Shirakawa, Tomonori; Yunoki, Seiji.

In: Journal of Physics: Conference Series, Vol. 454, No. 1, 012047, 2013.

Research output: Contribution to journalArticle

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