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Magnon Hall effect without Dzyaloshinskii-Moriya interaction on the frustrated star lattice | S. A. Owerre
; | Date: |
1 Sep 2016 | Abstract: | In quantum ferromagnetic insulators, magnon Hall effect and topological
protected magnon edge states are induced by the Dzyaloshinskii-Moriya
interaction (DMI), which provides spin-orbit coupling (SOC). For the ${f
q}=0$ N’eel order on the frustrated star-lattice, it is shown that the DMI
does not provide SOC, hence the system is topologically trivial with vanishing
thermal Hall conductivity $kappa_{xy}$ and no protected chiral edge states. We
show the existence of nonzero $kappa_{xy}$ and protected chiral edge states in
the presence of a magnetic field, which induces the required chiral interaction
$H_{chi}simcoschi({f S_{i}} imes{f S_{j}})_z$, necessary for
topological effects to exist, where $coschipropto ext{magnetic field
strength}$. We propose that this magnetic field effect can be accessible in
Polymeric Iron (III) Acetate --- a star-lattice antiferromagnet with both spin
frustration and long-range magnetic ordering. | Source: | arXiv, 1608.8605 | Services: | Forum | Review | PDF | Favorites |
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