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IOP Publishing, Journal of Physics: Conference Series, (273), p. 012147, 2011

DOI: 10.1088/1742-6596/273/1/012147

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Correlation-induced band suppression in the two-orbital Hubbard model

Journal article published in 2010 by E. Plekhanov, A. Avella ORCID, F. P. Mancini
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The orbital degrees of freedom are of vital importance in explanation of various phenomena. Among them is the orbital-selective Mott transition (OSMT), which is thought to occur in several materials as Ca$_{2-x}$Sr$_x$RuO$_4$ and La$_{n+1}$Ni${_n}$O$_{3n+1}$. OSMT is usually studied in the infinite-dimension limit, and for the time being, it is not clear if it could survive in one-dimensional (1D) case. There exist two scenarios for the OSMT: upon increasing the interaction in a two-band system i) one of the bands becomes insulating, while the other remains metallic and ii) one of the bands becomes empty, while the other may eventually undergo a single-band Mott insulator transition. In this work, we present a preliminary study of the two-orbital Hubbard model by means of Density Matrix Renormalization Group in 1D at quarter-filling, where the second scenario seems to be realized. In particular, we study the orbital densities, double occupancies and form-factors also in the case of finite inter-orbital inter-site hopping. Comment: 4 pages, 6 figures, SCES2010, Accepted for publication in Journal of Physics: Conference Series