Rausch R, Potthoff M, Kawakami N. Magnetic Doublon Bound States in the Kondo Lattice Model.
PHYSICAL REVIEW LETTERS 2019;
123:216401. [PMID:
31809148 DOI:
10.1103/physrevlett.123.216401]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Indexed: 06/10/2023]
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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