Magnetic Doublon Bound States in the Kondo Lattice Model
Roman Rausch1, Michael Potthoff2, Norio Kawakami1
1Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
Abstract:
We present a novel pairing mechanism for electrons, mediated by magnons. These paired bound states are termed "magnetic doublons." Applying numerically exact techniques (full diagonalization and the density-matrix renormalization group, DMRG) to the Kondo lattice model at strong exchange coupling J for different fillings and magnetic configurations, we demonstrate that magnetic doublon excitations exist as composite objects with very weak dispersion. They are highly stable, support a novel "inverse" colossal magnetoresistance and potentially other effects.
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