Lessons fromα-RuCl₃for pursuing quantum spin liquid physics in atomically thin materials

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Information Science

Background:

• Quantum spin liquids are exotic states of matter with potential for topological quantum computation.
• Kitaev magnetism provides a pathway to realize quantum spin liquids.
• Layered and exfoliatable materials offer unique platforms for studying Kitaev phenomena.

Purpose of the Study:

• To review experimental and theoretical progress on Kitaev magnetism in 2D materials.
• To highlight alpha-RuCl3 as a model system for studying Kitaev phenomena in atomically thin materials.
• To establish a framework for discovering and engineering new 2D Kitaev materials.

Main Methods:

• Focus on the antiferromagnetic Mott insulator alpha-RuCl3.
• Synthesis and fabrication of alpha-RuCl3 into van der Waals heterostructure devices.
• Application of electronic transport, optical, and tunneling spectroscopies.
• Theoretical modeling of Kitaev interactions.

Main Results:

• Work-function-mediated charge transfer significantly dopes alpha-RuCl3 and proximate materials.
• Kitaev interactions can be enhanced by up to 50% through doping.
• Demonstrated the utility of alpha-RuCl3 as a test bed for probing Kitaev phenomena in 2D devices.

Conclusions:

• The developed experimental techniques and theoretical insights provide a robust framework for 2D Kitaev material research.
• Alpha-RuCl3 serves as a crucial platform for advancing the understanding of Kitaev magnetism.
• This work paves the way for realizing elusive quantum spin liquid phases in engineered 2D materials.