Spectral signatures of magnon interactions in antiferromagnets in high fields
· Invited
Abstract
In this talk I will discuss signatures of interactions between magnons that show up in the dynamical spin correlations of antiferromagnets in presence of a magnetic field, focusing on the high magnetization regime. I will first present our results for the antiferromagnetic spin-1/2 chain, where we uncover the appearance of two-magnon bound states in the transverse dynamical susceptibility. This bound state feature generalizes the one arising from string states in the Bethe ansatz solution of the integrable case. I will then address higher-dimensional systems and argue that these observations are not unique to 1D.
*This work was supported by the Gordon and Betty Moore Foundation through Grant No. GBMF8690 to UCSB (A. K.), as well as the NSF CMMT program under Grant No. DMR-1818533 (L. B.) and DMR-1928919 (O. A. S.).
Use was made of the computational facilities administered by the Center for Scientific Computing at the CNSI and MRL (an NSF MRSEC; DMR-1720256) and purchased through NSF CNS1725797.
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Presenters
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Anna Keselman
- Kavli Institute for Theoretical Physics, University of California, Santa Barbara
- University of California, Santa Barbara