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Quasiparticle breakdown in a quantum spin liquid

M.B. Stone 1 , I.A. Zaliznyak 2 , T. Hong 3 , C.L. Broholm 3 and D.H. Reich 3. Quasiparticle breakdown in a quantum spin liquid. 1 ORNL, 2 BNL, 3 Johns Hopkins University. DMR-0454672.

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Quasiparticle breakdown in a quantum spin liquid

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  1. M.B. Stone1, I.A. Zaliznyak2, T. Hong3, C.L. Broholm3 and D.H. Reich3 Quasiparticle breakdown in a quantum spin liquid 1ORNL, 2BNL, 3Johns Hopkins University DMR-0454672 Strongly interacting systems can often be described in terms of elementary excitations --also called quasiparticles -- which interact with one another relatively weakly. In some systems, quasiparticles cannot survive beyond some threshold where certain decay channels open up. An example is superfluid helium, where density fluctuations (phonons) become unstable at a threshold wave vector, thereafter breaking into roton pairs. Using the CHRNS SPINS spectrometer, we have studied elementary magnetic excitations (magnons) in a 2-dimensional quantum magnet: piperazinium hexachlorodicuprate (PHCC). The black line in the upper panel shows the single-magnon dispersion and the white lines represent the upper and lower bounds of the two-magnon continuum. Beyond the point of intersection of the single magnon mode with the two-magnon continuum, shown as , the quasiparticle description of the excitations breaks down. The lower panel illustrates the transfer of spectral weight to the continuum as the spectrum termination point is approached. M.B. Stone, I.A. Zaliznyak, T. Hong, C.L. Broholm and D.H. Reich, Nature 440, 187 (2006).

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