Junya OTSUKI Affiliation : Research Institute for Interdisciplinary Science,   Okayama University, Okayama, Japan see   Jeschke-Otsuki group for group members, and   Department of Physics for the graduate school Academic degree : Ph.D (Science, Tohoku University), March 2008 Reseach field : Theory of strongly correlated (f-)electron systems E-Mail : j.otsuki(at)okayama-u.ac.jp Hometown : Hachioji, Tokyo, Japan

Research activities

• Publications
  
• Proceedings
  
• Thesis, Articles
  
• Presentations
  

Research topics

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1. Kondo lattice model

   • Phase diagram of the Kondo lattice derived by dynamical mean-field theory (DMFT)
     
     
     "The Kondo Lattice Model in Infinite Dimensions II. Static Susceptibilities and Phase Diagram"
     J. Otsuki, H. Kusunose and Y. Kuramoto: J. Phys. Soc. Jpn. 78 (2009) 034719-1--9
     
     
   • Is f-electron itinirant or localized? Formation of a large Fermi surface
     
     
     "Evolution of a Large Fermi Surface in the Kondo Lattice"
     J. Otsuki, H. Kusunose and Y. Kuramoto: Phys. Rev. Lett. 102 (2009) 017202

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2. f² configuration

   • Composite order
     
     "Diagonal composite order in two-channel Kondo lattice"
     S. Hoshino, J. Otsuki, Y. Kuramoto: Phys. Rev. Lett. 107 (2011) 247202
   • Staggered order of Kondo singlet and crystal-field singlet
     "Electronic Order with Staggered Kondo and Crystalline Electric Field Singlets"
     S. Hoshino, J. Otsuki and Y. Kuramoto: J. Phys. Soc. Jpn. 79 (2010) 074720-1--10
   • Dynamics in system with competition between Kondo singlet and crystal-field singlet
   • Kondo effect in praseodymium compounds

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3. Realistic materials

   • Antiferromagnetic transition temperatures in Ce compounds
     
     "First-Principles Simulations of Heavy Fermion Cerium Compounds Based on the Kondo Lattice"
     M. Matsumoto, M. J. Han, J. Otsuki and S. Y. Savrasov: Phys. Rev. Lett. 103 (2009) 096403
     
     

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4. Methodology

   • Continuous-time quantum Monte Carlo method for the Kondo model
     
     
     "Continuous-Time Quantum Monte Carlo Method for the Coqblin-Schrieffer Model"
     J. Otsuki, H. Kusunose, P. Werner and Y. Kuramoto: J. Phys. Soc. Jpn. 76 (2007) 114707-1--11
     
     
   • NCA (Non-Crossing Approximation): expansion around the atomic limit
     • Finite Coulomb repulsion
     • c-f Coulomb repulsion

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5. Superconductivity in strongly correlated systems

   • Two-particle self-consistent theory
     
     
     
     "Two-particle self-consistent approach to unconventional superconductivity"
     J. Otsuki: Phys. Rev. B 85, 104513 (2012)

Link

• Condensed Matter Physics Theory, Department of Physics, Tohoku University
• Theoretical Physics III, University of Augsburg (Vollhardt group)