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17 February 2025 |
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Neutron tomography of magnetic Majorana fermions in a proximate quantum spin liquid | Arnab Banerjee
; Jiaqiang Yan
; Johannes Knolle
; Craig A. Bridges
; Matthew B. Stone
; Mark D. Lumsden
; David G. Mandrus
; David A. Tennant
; Roderich Moessner
; Stephen E. Nagler
; | Date: |
1 Sep 2016 | Abstract: | Quantum matter provides an effective vacuum out of which arise emergent
particles not corresponding to any experimentally detected elementary particle.
Topological quantum materials in particular have become a focus of intense
research in part because of the remarkable possibility to realize Majorana
fermions, with their potential for new, decoherence-free quantum computing
architectures. In this paper we undertake a study on high-quality single
crystal of $alpha-RuCl_3$ which has been identified as a material realizing a
proximate Kitaev state, a topological quantum state with magnetic Majorana
fermions. Four-dimensional tomographic reconstruction of dynamical correlations
measured using neutrons is uniquely powerful for probing such magnetic states.
We discover unusual signals, including an unprecedented column of scattering
over a large energy interval around the Brillouin zone center which is
remarkably stable with temperature. This is straightforwardly accounted for in
terms of the Majorana excitations present in Kitaev’s topological quantum spin
liquid. Other, more delicate, features in the scattering can be transparently
associated with perturbations to an ideal model. This opens a window on
emergent magnetic Majorana fermions in correlated materials. | Source: | arXiv, 1609.0103 | Services: | Forum | Review | PDF | Favorites |
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