Excitations near the boundary between a metal and a Mott insulator

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.

9 pages, 4 figures

References in corpus (7)

• Many-Body Physics with Ultracold Gases
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Cited by in corpus (6)

• What Tc Tells
• Quenching of Impurity Spins at Cu/CuO Interfaces: An Antiferromagnetic Proximity Effect
• Kondo screening and Magnetism at Interfaces
• Density of States and Magnetic Correlations at a Metal-Mott Insulator Interface
• The t-J model on a semi-infinite lattice
• Excitations and spin correlations near the interface of two three-dimensional Heisenberg antiferromagnets