University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Tuesday, March 17th 2015
4:30 pm:
CM Journal Club in 236A Tate
Speaker: Morten Holm Christensen
Subject: Effect of Hund's coupling on Mott physics in multi-band systems

I will begin with a brief review of Mott physics in the one-band case. After having introduced the necessary terminology I introduce a general multi-band model and argue that, due to the presence of the Hund's coupling in such a model, the system can undergo a so-called orbital-selective Mott transition [1]. Subsequently, I highlight the substantial differences between the half-filled case and the non-half-filled case [2]. Finally I will discuss the possible manifestation of this transition in the iron-chalcogenides [3].
[1] L. de' Medici et al. Phys. Rev. Lett. 102, 126401 (2009).
[2] L. de' Medici, Phys. Rev. B. 83, 205112 (2011).
[3] Z. Xu et al. Phys. Rev. B. 84 052506 (2011).

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