Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.107204
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Funding
- Swiss National Science Foundation
- Royal Society
- EPSRC
- FOM
- Engineering and Physical Sciences Research Council [EP/F032293/1] Funding Source: researchfish
- EPSRC [EP/F032293/1] Funding Source: UKRI
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We measure by inelastic neutron scattering the spin excitation spectra as a function of applied magnetic field in the quantum spin-ladder material (C(5)H(12)N)(2)CuBr(4). 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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