Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder

Details Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder

2008-12-19

arxiv.org/abs/0812.3880v1

Phys. Rev. Lett. 102, 107204 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.102.107204

We measure by inelastic neutron scattering the spin excitation spectra as a function of applied magnetic field in the quantum spin-ladder material (C5H12N)2CuBr4. Discrete magnon modes at low fields in the quantum disordered phase and at high fields in the saturated phase contrast sharply with a spinon continuum at intermediate fields characteristic of the Luttinger-liquid phase. By tuning the magnetic field, we drive the fractionalization of magnons into spinons and, in this deconfined regime, observe both commensurate and incommensurate continua.

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