Weak-coupling to strong-coupling quantum criticality crossover in a Kitaev quantum spin liquid α-RuCl3
We report a quantum criticality crossover representing two different universal scaling behaviors in a Kitaev quantum magnetic material α -RuCl 3 . α -RuCl 3 presents both a symmetry-breaking antiferromagnetic order and a long-range entangled topological order of a quantum spin liquid, and thus could...
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Veröffentlicht in: | npj quantum materials 2023-06, Vol.8 (1), p.33-12, Article 33 |
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Hauptverfasser: | , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We report a quantum criticality crossover representing two different universal scaling behaviors in a Kitaev quantum magnetic material
α
-RuCl
3
.
α
-RuCl
3
presents both a symmetry-breaking antiferromagnetic order and a long-range entangled topological order of a quantum spin liquid, and thus could be a candidate system for a unique universality class involving deconfined fractionalized excitations of the local Z
2
fluxes and itinerant Majorana fermions. Theoretical analyses on the inelastic neutron scattering, ac-magnetic susceptibility, and specific heat results demonstrate that Wilson–Fisher-Yukawa-type ‘conventional’ weak-coupling quantum criticality in high-energy scales crosses over to heavy-fermion-type ‘local’ strong-coupling one in low-energy scales. Our findings provide deep insight on how quantum criticality evolves in fermion-boson coupled topological systems with different types of deconfined fermions. |
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ISSN: | 2397-4648 2397-4648 |
DOI: | 10.1038/s41535-023-00563-w |