Condensed Matter Seminar feat. Bella Lake "First exploration of novel Bethe string states in the model magnetic material SrCo2V2O8"

Complex bound states of magnetic excitations, known as Bethe strings, were predicted almost a century ago to exist in one-dimensional quantum magnets. The string states have so far remained the subject of intense theoretical studies but without experimental verification. Here, by performing neutron scattering experiments on the one-dimensional Heisenberg-Ising antiferromagnet SrCo2V2O8 in high longitudinal magnetic fields, we reveal and explore the string states and find excellent agreement with Bethe-ansatz calculations.