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- W2021630251 abstract "The celebrated Shastry Sutherland model has a gapped dimer singlet ground state. The material SrCu$_2$(BO$_3$)$_2$ serves as a good realization of this model, upto small anisotropies arising from Dzyaloshinskii-Moriya (DM) interactions. The DM interactions admix a triplet component into the singlet ground state and give rise to weakly dispersing triplon bands. We show that an applied magnetic field splits the triplon modes and opens band gaps. Surprisingly, we are left with topological bands with Chern numbers $pm 2$. SrCu$_2$(BO$_3$)$_2$ thus supports topologically protected triplonic edge modes and is a magnetic analogue of the integer quantum Hall effect. At a critical value of the magnetic field set by the strength of DM interactions, the three triplon bands touch once again in a spin-1 generalization of a Dirac cone, and lose their topological character. We predict a strong thermal Hall signature in the topological regime." @default.
- W2021630251 created "2016-06-24" @default.
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- W2021630251 date "2015-04-13" @default.
- W2021630251 modified "2023-10-10" @default.
- W2021630251 title "Hall effect of triplons in a dimerized quantum magnet" @default.
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- W2021630251 doi "https://doi.org/10.1038/ncomms7805" @default.
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