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Giant phonon anomalies in the proximate Kitaev quantum spin liquid α-RuCl3.
Li, Haoxiang; Zhang, T T; Said, A; Fabbris, G; Mazzone, D G; Yan, J Q; Mandrus, D; Halász, Gábor B; Okamoto, S; Murakami, S; Dean, M P M; Lee, H N; Miao, H.
Afiliación
  • Li H; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
  • Zhang TT; Department of Physics, Tokyo Institute of Technology, Okayama, Meguro-ku, Tokyo, Japan.
  • Said A; Tokodai Institute for Element Strategy, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama, Kanagawa, Japan.
  • Fabbris G; Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA.
  • Mazzone DG; Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA.
  • Yan JQ; Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY, USA.
  • Mandrus D; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Villigen, Switzerland.
  • Halász GB; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
  • Okamoto S; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
  • Murakami S; Department of Materials Science and Engineering, the University of Tennessee at Knoxville, Knoxville, TN, USA.
  • Dean MPM; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
  • Lee HN; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
  • Miao H; Department of Physics, Tokyo Institute of Technology, Okayama, Meguro-ku, Tokyo, Japan.
Nat Commun ; 12(1): 3513, 2021 Jun 10.
Article en En | MEDLINE | ID: mdl-34112804
The Kitaev quantum spin liquid epitomizes an entangled topological state, for which two flavors of fractionalized low-energy excitations are predicted: the itinerant Majorana fermion and the Z2 gauge flux. It was proposed recently that fingerprints of fractional excitations are encoded in the phonon spectra of Kitaev quantum spin liquids through a novel fractional-excitation-phonon coupling. Here, we detect anomalous phonon effects in α-RuCl3 using inelastic X-ray scattering with meV resolution. At high temperature, we discover interlaced optical phonons intercepting a transverse acoustic phonon between 3 and 7 meV. Upon decreasing temperature, the optical phonons display a large intensity enhancement near the Kitaev energy, JK~8 meV, that coincides with a giant acoustic phonon softening near the Z2 gauge flux energy scale. These phonon anomalies signify the coupling of phonon and Kitaev magnetic excitations in α-RuCl3 and demonstrates a proof-of-principle method to detect anomalous excitations in topological quantum materials.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2021 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2021 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido