Many-body theory of magneto-elasticity in one dimension
Abstract
We construct a many-body theory of magneto-elasticity in one dimension and show that the dynamical correlation functions of the quantum magnet, connecting the spins with phonons, involve all energy scales. Accounting for all magnetic states non-perturbatively via the exact diagonalisation techniques of Bethe ansatz, we find that the renormalisation of the phonon velocity is a non-monotonous function of the external magnetic field and identify a new mechanism for attenuation of phonons - via hybridisation with the continuum of excitations at high energy. We conduct ultrasonic measurements on a high-quality single crystal of the frustrated spin-1/2 Heisenberg antiferromagnet in its one-dimensional regime and confirm the theoretical predictions, demonstrating that ultrasound can be used as a powerful probe of strong correlations in one dimension.
Keywords
Cite
@article{arxiv.1610.00295,
title = {Many-body theory of magneto-elasticity in one dimension},
author = {O. Tsyplyatyev and P. Kopietz and Y. Tsui and B. Wolf and P. T. Cong and N. van Well and F. Ritter and C. Krellner and W. Aßmus and M. Lang},
journal= {arXiv preprint arXiv:1610.00295},
year = {2017}
}
Comments
17 pages, 9 figures