Kinetic Ferromagnetism and Topological Magnons of the Hole-Doped Kitaev Spin Liquid
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866913513695346688 |
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| author | Jin, Hui-Ke Kadow, Wilhelm Knap, Michael Knolle, Johannes |
| author_facet | Jin, Hui-Ke Kadow, Wilhelm Knap, Michael Knolle, Johannes |
| contents | We study the effect of hole doping on the Kitaev spin liquid (KSL) and find that for ferromagnetic (FM) Kitaev exchange $K$ the system is very susceptible to the formation of a FM spin polarization. Through density matrix renormalization group (DMRG) simulations on finite systems, we uncover that the introduction of a single hole with a hopping strength of just $t\sim{}0.28K$ is enough to disrupt fractionalization and polarize the spins in the [001] direction due to an order-by-disorder mechanism. Taking into account a material relevant FM anisotropic spin exchange $\varGamma$ drives the polarization towards the [111] direction via a reorientation transition into a topological FM state with chiral magnon excitations. We develop a parton mean-field theory incorporating fermionic holons and bosonic spinons/magnons, which accounts for the doping induced FM phases and topological magnon excitations. We discuss experimental signatures and implications for Kitaev candidate materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_15153 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Kinetic Ferromagnetism and Topological Magnons of the Hole-Doped Kitaev Spin Liquid Jin, Hui-Ke Kadow, Wilhelm Knap, Michael Knolle, Johannes Strongly Correlated Electrons Materials Science We study the effect of hole doping on the Kitaev spin liquid (KSL) and find that for ferromagnetic (FM) Kitaev exchange $K$ the system is very susceptible to the formation of a FM spin polarization. Through density matrix renormalization group (DMRG) simulations on finite systems, we uncover that the introduction of a single hole with a hopping strength of just $t\sim{}0.28K$ is enough to disrupt fractionalization and polarize the spins in the [001] direction due to an order-by-disorder mechanism. Taking into account a material relevant FM anisotropic spin exchange $\varGamma$ drives the polarization towards the [111] direction via a reorientation transition into a topological FM state with chiral magnon excitations. We develop a parton mean-field theory incorporating fermionic holons and bosonic spinons/magnons, which accounts for the doping induced FM phases and topological magnon excitations. We discuss experimental signatures and implications for Kitaev candidate materials. |
| title | Kinetic Ferromagnetism and Topological Magnons of the Hole-Doped Kitaev Spin Liquid |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2309.15153 |