Development of new calculation techniques for the high-energy spectroscopy and search for novel orbital orders

2015 Fiscal Year Final Research Report

• Project/Area Number: 25400377
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Hiroshima University
• Principal Investigator: Tanaka Arata 広島大学, 先端物質科学研究科, 助教 (70253052)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 強相関電子系 / 軌道秩序 / 高エネルギー分光 / 動的平均場理論 / 共鳴軟X線弾性散乱 / デュアルフェルミオン法 / 金属絶縁体転移 / ハバードモデル

Outline of Final Research Achievements

Strongly correlated electron systems have long been studied because of their fascinating features such as high-temperature superconductance or magnetism. In recent years, the dynamical mean-field theory (DMFT) has attracted attentions as it can render accurate descriptions of such strongly correlated systems. In this study, we developed new calculation techniques and a computer program, which can calculate spectral functions as well as ground state properties of strongly correlated electron systems accurately, based on the dual-fermion method, an extension of DMFT. We investigated the metal-insulator transition in the Hubbard model, which is one of the fundamental models of strongly correlated electron systems. We also discussed soft x-ray resonant diffraction and high-energy spectroscopy as a means to observe orbital orders and conducted analyses of the spectra in materials with orbital orders.

Free Research Field

固体物理学