Periodic entanglement of magnons in an antiferromagnet

Bo Zhang, Yunxia Ping

Heda Zhang, Zhiying Zhao, Vasile Ovidiu Garlea +6 more

Giammarco Fabiani, Johan H. Mentink

We investigate entanglement dynamics in the antiferromagnetic Heisenberg model in two dimensions following a spatially anisotropic quench of the exchange interactions. Opposed to established results in one dimension, the magnon quasiparticles show an initial growth of entanglement dynamics that does not depend on the system size and is governed by the oscillation period of the exchange interaction. This is much faster than the highest quasiparticle velocity, which we explain by the dominance of the intrinsic entanglement of short wavelength non-propagating magnon-pairs. Furthermore, by adopting the neural quantum states, we provide numerical evidence that this behavior survives even in the presence of strong magnon-magnon interactions, suggesting new avenues for manipulating entanglement dynamics in quantum materials.

Giammarco Fabiani, Johan H. Mentink

We investigate entanglement dynamics in the antiferromagnetic Heisenberg model in two dimensions following a spatially anisotropic quench of the exchange interactions. Opposed to established results in one dimension, the magnon quasiparticles show an initial growth of entanglement dynamics that does not depend on the system size and is governed by the oscillation period of the exchange interaction. We ascribe this to the dominance of the intrinsic entanglement of short wavelength nonpropagating magnon pairs, which also leads to a competition between area-law and volume-law contribution in the entanglement dynamics. Furthermore, by adopting the neural-network quantum states, we provide numerical evidence that this behavior survives even in the presence of strong magnon-magnon interactions, suggesting intriguing avenues for manipulating entanglement dynamics in quantum materials.

Grégoire Misguich, C. Lhuillier

Jos 'e A. Hoyos, Shailesh Chandrasekharan A, Harold U. Baranger