Continuous-Time Quantum Monte Carlo Approach to Singlet–Triplet Kondo Systems

• Hoshino Shintaro

  Department of Physics, Tohoku University

• Otsuki Junya

  Department of Physics, Tohoku University

• Kuramoto Yoshio

  Department of Physics, Tohoku University

抄録

Dynamical properties are studied numerically for a variant of the Kondo model with singlet and triplet crystalline electric field (CEF) levels where Kondo and CEF singlets compete for the ground state. Using the continuous-time quantum Monte Carlo method, we derive the t-matrix of conduction electrons and dynamical susceptibilities of local electrons without encountering the negative sign problem. When the CEF splitting is comparable to the Kondo temperature, the dynamical response has only a quasi-elastic peak. Nevertheless, the local single-particle spectrum shows an energy gap in strong contrast with the ordinary Kondo model.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 78 (7), 074719-074719, 2009

  一般社団法人 日本物理学会

キーワード

• continuous-time quantum Monte Carlo method
• Kondo effect
• <I>t</I>-matrix
• dynamical susceptibility
• Pade approximation

詳細情報

• CRID: 1390001204196821888
• NII論文ID: 130005437530
• NII論文ID: 10025962909
• NII論文ID: 210000107897
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.78.074719
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 10280872
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10280872
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.78.074719
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可