Highly Dispersive Scattering From Defects In Non-Collinear Magnets

Abstract

We demonstrate that point-like defects in non-collinear magnets give rise to a highly dispersive structure in the magnon scattering, violating a standard paradigm of its momentum independence. For a single impurity spin coupled to a prototypical non-collinear antiferromagnet we find that the resolvent is dominated by a distinct dispersive structure with its momentum-dependence set by the magnon dispersion and shifted by the ordering vector. This feature is a consequence of umklapp scattering off the impurity-induced spin texture, which arises due to the non-collinear ground state of the host system. Detailed results for the staggered and uniform magnetization of this texture as well as the T-matrix from numerical linear spin-wave theory are presented.

5+5 pages, 4+5 figs

References in corpus (21)

• Quantum Impurity in a Nearly Critical Two Dimensional Antiferromagnet
• Quantum Impurities in the Two-Dimensional Spin One-Half Heisenberg Antiferromagnet
• Local Enhancement of Antiferromagnetic Correlations by Nonmagnetic Impurities
• Site dilution in Kitaev's honeycomb model
• Valence Bond Glass Phase in the Diluted Kagome Antiferromagnets
• Diluted quantum antiferromagnets: spin excitations and long-range order
• Static impurities in the kagome lattice: dimer freezing and mutual repulsion
• Multi-critical point in a diluted bilayer Heisenberg quantum antiferromagnet
• Percolation quantum phase transitions in diluted magnets
• Susceptibility of the 2D S=1/2 Heisenberg antiferromagnet with an impurity
• Field-induced decay dynamics in square-lattice antiferromagnet
• Quantum percolation in two-dimensional antiferromagnets
• Fractional impurity moments in two-dimensional non-collinear magnets
• Quantum-criticality and percolation in dimer-diluted 2D antiferromagnets
• Long-range order and low-energy spectrum of diluted 2D quantum AF
• Universal alternating order around impurities in antiferromagnets
• Impurity-doped Kagome Antiferromagnet: A Quantum Dimer Model Approach
• Singular field response and singular screening of vacancies in antiferromagnets
• Anticollinear magnetic order induced by impurities in the frustrated Heisenberg model of pnictides
• Long-range dynamics of magnetic impurities coupled to a two-dimensional Heisenberg antiferromagnet
• Static Holes in the Geometrically Frustrated Bow Tie Ladder

Cited by in corpus (10)

• Lifetimes of antiferromagnetic magnons in two and three dimensions: experiment, theory, and numerics
• Triangular antiferromagnet with nonmagnetic impurities
• Field-induced decays in $XXZ$ triangular-lattice antiferromagnets
• Spin texture induced by non-magnetic doping and spin dynamics in 2D triangular lattice antiferromagnet h-Y(Mn,Al)O3
• Localized and propagating excitations in gapped phases of spin systems with bond disorder
• Relativistic and thermal effects on the magnon spectrum of a ferromagnetic monolayer
• Roller-Coaster in a Flatland: Magnetoresistivity in Eu-intercalated Graphite
• Antiferromagnets with random vacancies and substitutional spins on the triangular lattice
• Self-consistent T-matrix approach to Bose-glass in one dimension
• Bond disorder in extended Heisenberg-Kitaev models: Spin textures and in-gap states in the high-field regime