Non-Abelian statistics in light scattering processes across interacting Haldane chains
| Autor: | Bodo Lobbenmeier, Dirk Wulferding, Vladimir Gnezdilov, Anup Kumar Bera, Vladimir Kurnosov, Yurii G. Pashkevich, A. T. M. Nazmul Islam, Bella Lake, Peter Lemmens |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Surface (mathematics) Condensed Matter - Materials Science Strongly Correlated Electrons (cond-mat.str-el) Degrees of freedom (physics and chemistry) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Quantum Materials Light scattering symbols.namesake Condensed Matter - Strongly Correlated Electrons Chain (algebraic topology) Statistics symbols Condensed Matter::Strongly Correlated Electrons Singlet state Abelian group Spin (physics) Raman spectroscopy |
| Popis: | The $S=1$ Haldane state is constructed from a product of local singlet dimers in the bulk and topological states at the edges of a chain. It is a fundamental representative of topological quantum matter. Its well-known representative, the quasi-one-dimensional SrNi$_2$V$_2$O$_8$ shows both conventional as well as unconventional magnetic Raman scattering. The former is observed as one- and two-triplet excitations with small linewidths and energies corresponding to the Haldane gap $\Delta_H$ and the exchange coupling $J_c$ along the chain, respectively. Well-defined magnetic quasiparticles are assumed to be stabilized by interchain interactions and uniaxial single-ion anisotropy. Unconventional scattering exists as broad continua of scattering with an intensity $I(T)$ that shows a mixed bosonic / fermionic statistic. Such a mixed statistic has also been observed in Kitaev spin liquids and could point to a non-Abelian symmetry. As the ground state in the bulk of SrNi$_2$V$_2$O$_8$ is topologically trivial, we suggest its fractionalization to be due to light-induced interchain exchange processes. These processes are supposed to be enhanced due to a proximity to an Ising ordered state with a quantum critical point. A comparison with SrCo$_2$V$_2$O$_8$, the $S=1/2$ analogue to our title compound, supports these statements. Comment: 3 figures, 1 table |
| Databáze: | OpenAIRE |
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