Research on electronic states using a microscopic model for high-temperature superconductors

2016 Fiscal Year Final Research Report

• Project/Area Number: 26400372
• 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: National Institute for Materials Science
• Principal Investigator: Kohno Masanori 国立研究開発法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点, 主幹研究員 (40370308)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 高温超伝導体 / モット転移 / t-Jモデル / クラスター摂動理論 / 擬ギャップ / ドーピング誘起状態 / 動的密度行列繰り込み群法 / スピンと電荷の分離

Outline of Final Research Achievements

To comprehensively understand the properties of cuprate high-temperature superconductors from the microscopic level, the electronic states of the two-dimensional t-J model, which is a model derivable from atomic orbitals of high-temperature superconductors, are investigated, and various anomalous features observed in cuprate high-temperature superconductors are collectively explained as properties near the Mott transition. In addition, by using t-J models, the emergence of states in the gap by doping a Mott insulator, which is a distinctive feature of the Mott transition, is investigated, and it is shown that double occupancy is not essential to this feature and that this feature can be interpreted as the emergence of low-energy spin excited states of a Mott insulator in the electronic excitation spectrum with the dispersion relation shifted by the Fermi momentum by doping a Mott insulator, reflecting the spin-charge separation of the Mott insulator.

Free Research Field

物性理論物理