Confinement of Fractional Quantum Number Particles in a Condensed-matter System

@article{Lake2010ConfinementOF,
  title={Confinement of Fractional Quantum Number Particles in a Condensed-matter System},
  author={Bella Lake and Alexei M. Tsvelik and S. Notbohm and David Alan Tennant and Toby G. Perring and Manfred Reehuis and Chinnathambi Sekar and Gernot Krabbes and Bernd Buchner},
  journal={Nature Physics},
  year={2010},
  volume={6},
  pages={50-55}
}
The composition of integral quantum number particles such as protons and neutrons from the strong confinement of fractional quantum number particles such as quarks is well known in high-energy physics. Now, similar behaviour has been found in condensed-matter physics, in the excitation spectra of a weakly coupled spin-ladder compound. 
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