EXCITATIONS NEAR THE BOUNDARY BETWEEN A METAL AND A MOTT INSULATOR
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Publication:3560137
DOI10.1142/S021797921005507XzbMATH Open1186.82094arXiv0904.4314OpenAlexW3104770516MaRDI QIDQ3560137
Author name not available (Why is that?)
Publication date: 19 May 2010
Published in: (Search for Journal in Brave)
Abstract: A heterostructure of a semi-infinite metal and a Mott insulator is considered. It is supposed that both materials have an identical lattice spacing and hopping integrals and differ in the Hubbard repulsion which is negligible in the metal and exceeds the critical value for the Mott transition in the insulator. At half-filling and for low temperatures the insulator has the long-range antiferromagnetic order. Its low-lying elementary excitations are standing spin waves and a spin-wave mode which is localized near the interface and has a two-dimensional dispersion. This mode ejects bulk modes from the boundary region. The antiferromagnetic ordering of the insulator induces an antiferromagnetic order in the metal where the magnetization decays exponentially with distance from the interface. This decay is characterized by the correlation length equal to 5-6 lattice spacings.
Full work available at URL: https://arxiv.org/abs/0904.4314
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