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Half-integer thermal quantum Hall conductance was observed in the honeycomb material α-RuCl3, even without an out-of-plane magnetic field. This suggests persistent non-Abelian topological order in this material.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Topological Phases of Matter

Background:

  • Two-dimensional (2D) materials offer unique platforms for exploring exotic quantum phenomena.
  • Honeycomb materials like α-RuCl3 are candidates for realizing Kitaev spin liquid states.
  • Topological quantum phenomena, such as the quantum Hall effect, are of significant scientific interest.

Purpose of the Study:

  • To investigate the nature of thermal quantum Hall conductance in α-RuCl3.
  • To determine if half-integer quantized thermal Hall conductance occurs without an out-of-plane magnetic field.
  • To explore the relationship between observed phenomena and topological orders.

Main Methods:

  • Experimental measurement of thermal Hall conductance in α-RuCl3 under varying magnetic field orientations.
  • Analysis of the field-angular dependence of the quantized thermal Hall conductance.
  • Comparison of experimental results with theoretical predictions for topological Chern numbers.

Main Results:

  • Observation of a half-integer thermal quantum Hall conductance plateau in α-RuCl3.
  • The plateau persists even when the magnetic field has no out-of-plane component.
  • The field-angular variation matches the sign structure of the topological Chern number for a pure Kitaev spin liquid.

Conclusions:

  • The findings suggest the presence of non-Abelian topological order in α-RuCl3.
  • This topological order persists despite the presence of non-Kitaev interactions.
  • The results provide strong evidence for fractionalization of local magnetic moments in this material.