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Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder

This paper reports the first direct observation of field-induced fractionalization of the excitation quasiparticles in a quantum spin ladder compound. This work forms part of a wider study that was initiated at UCL by myself and Christian Ruegg (now at the Paul Scherrer Institut) when he was working with me as a post-doc. I played a leading role in the project, from its conception, through to performing the experiments, contributing to the analysis, and played an active role in writing up the results for publication. I have given several invited talks at international conferences on this subject.