Journal Article

PreJuSER-12048

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Cluster dynamical mean-field study of strongly correlated heterostructures: Correlation-induced reduction of proximity effect

Ishida, H. ; Liebsch, A.FZJ*

2010
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/10963  doi:10.1103/PhysRevB.82.045107

Abstract: We present a dynamical mean-field theory (DMFT) study of strongly correlated heterostructures. In contrast to previous DMFT work on multilayered systems, which was mainly based on the single-site approximation, we investigate the role of interplanar Coulomb correlations by using cellular DMFT. Accordingly, the self-energy matrix exhibits off-diagonal components in the layer index. As a model system we consider the single-band Hubbard model in a thin film geometry. The films can be either free standing or sandwiched between semi-infinite metallic leads. For isolated thin films, it is shown that the metal-insulator phase transition occurs either via a conventional mechanism, with a diverging imaginary part of the local self-energy, or via another one involving a discontinuous change of the real part of the off-diagonal self-energy. When the film is connected to metallic leads, the former phase transition disappears due to the normal-metal proximity effects, whereas the latter survives and significantly influences the electronic properties of the thin film. The leakage of metallic states into the Mott gap of the correlated film is greatly reduced compared to single-site DMFT calculations.

Keyword(s): J

Note: The work of H. I. was supported by the Grand-in-Aid for Scientific Research (Grant No. 20540191) from the Japan Society for Promotion of Science.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IFF-1)

Research Program(s):

1. Kondensierte Materie (P54)

Appears in the scientific report 2010

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