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Journal Article

Dynamics of the Kitaev-Heisenberg Model

MPS-Authors
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Gohlke,  Matthias
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Verresen,  Ruben
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Moessner,  Roderich
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Pollmann,  Frank
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Gohlke, M., Verresen, R., Moessner, R., & Pollmann, F. (2017). Dynamics of the Kitaev-Heisenberg Model. Physical Review Letters, 119(15): 157203. doi:10.1103/PhysRevLett.119.157203.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002E-9057-8
Abstract
We introduce a matrix-product state based method to efficiently obtain dynamical response functions for two-dimensional microscopic Hamiltonians. We apply this method to different phases of the Kitaev-Heisenberg model and identify characteristic dynamical features. In the ordered phases proximate to the spin liquid, we find significant broad high-energy features beyond spin-wave theory, which resemble those of the Kitaev model. This establishes the concept of a proximate spin liquid, which was recently invoked in the context of inelastic neutron scattering experiments on alpha-RuCl3. Our results provide an example of a natural path for proximate spin liquid features to arise at high energies above a conventionally ordered state, as the diffuse remnants of spin-wave bands intersect to yield a broad peak at the Brillouin zone center.