For the gapped XXZ spin chain, integrable boundary impurities show four phases, while non-integrable couplings add a mid-gap phase and screen ferromagnetic impurities.
Local spin-flip transitions induced by magnetic quantum impurities in two-dimensional magnets
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abstract
We predict a general local spin-flip transition mechanism caused by magnetic quantum impurities in (partially) polarized phases of quantum magnets in the absence of conservation laws. This transition arises when a magnon bound state crosses zero energy as function of the magnetic field. As application, we study 2D van der Waals magnets described by the Kitaev-Heisenberg honeycomb model which applies to the transition metal trihalides CrI$_3$ and $\alpha$-RuCl$_3$. We consider adatom and substitutional impurity positions, and show how spin-flip transitions can be detected in scanning tunneling spectroscopy.
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cond-mat.str-el 1years
2024 1verdicts
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Edge modes and boundary impurities in the anisotropic Heisenberg spin chain
For the gapped XXZ spin chain, integrable boundary impurities show four phases, while non-integrable couplings add a mid-gap phase and screen ferromagnetic impurities.