Aug 9 – 20, 2010
Europe/Stockholm timezone

Kjäll, Jonas (UC Berkeley): Bound states with E8 symmetry in quantum Ising-like chains

Aug 17, 2010, 3:15 PM


Roslagstullsbacken 23, 106 91 Stockholm, Sweden


In a recent experiment on CoNb2O6, Coldea et. al. found for the first time experimental evidence of the exceptional Lie algebra E8. The emergence of this symmetry was theoretically predicted long ago for the transverse quantum Ising chain in the presence of a weak longitudinal field. We consider an accurate microscopic model of CoNb2O6 and calculate numerically the dynamical structure function using a recently developed matrix-product state based method. The excitation spectra contain bound states which are characteristic to the E8 symmetry. We furthermore compare the observed bound states to the ones found in the transverse Ising chain in a longitudinal field.

Primary author

Mr Jonas Kjäll (UC Berkeley)

Presentation materials