Hierarchy of bound states in the one-dimensional ferromagnetic Ising Chain CoNb2 O6 investigated by high-resolution time-domain terahertz spectroscopy

C. M. Morris, R. Valdés Aguilar, A. Ghosh, S. M. Koohpayeh, J. Krizan, R. J. Cava, O. Tchernyshyov, T. M. McQueen, N. P. Armitage

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Abstract

Kink bound states in the one-dimensional ferromagnetic Ising chain compound CoNb2O6 have been studied using high-resolution time-domain terahertz spectroscopy in zero applied magnetic field. When magnetic order develops at low temperature, nine bound states of kinks become visible. Their energies can be modeled exceedingly well by the Airy function solutions to a 1D Schrödinger equation with a linear confining potential. This sequence of bound states terminates at a threshold energy near 2 times the energy of the lowest bound state. Above this energy scale we observe a broad feature consistent with the onset of the two particle continuum. At energies just below this threshold we observe a prominent excitation that we interpret as a novel bound state of bound states - two pairs of kinks on neighboring chains.

Original languageEnglish (US)
Article number137403
JournalPhysical review letters
Volume112
Issue number13
DOIs
StatePublished - Apr 2 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Morris, C. M., Valdés Aguilar, R., Ghosh, A., Koohpayeh, S. M., Krizan, J., Cava, R. J., Tchernyshyov, O., McQueen, T. M., & Armitage, N. P. (2014). Hierarchy of bound states in the one-dimensional ferromagnetic Ising Chain CoNb2 O6 investigated by high-resolution time-domain terahertz spectroscopy. Physical review letters, 112(13), [137403]. https://doi.org/10.1103/PhysRevLett.112.137403