TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.15.1.022
TI  - Chaos enhancement in large-spin chains
PY  - 2023/07/21
UR  - https://scipost.org/SciPostPhys.15.1.022
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 15
IS  - 1
SP  - 022
A1  - Lebel, Yael
AU  - Santos, Lea F.
AU  - Bar Lev, Yevgeny
AB  - We study the chaotic properties of a large-spin XXZ chain with onsite disorder and a small number of excitations above the fully polarized state. We show that while the classical limit, which is reached for large spins, is chaotic, enlarging the spin suppresses quantum chaos features. We examine ways to facilitate chaos by introducing additional terms to the Hamiltonian. Interestingly, perturbations that are diagonal in the basis of product states in the $z$-direction do not lead to significant enhancement of chaos, while off-diagonal perturbations restore chaoticity for large spins, so that only three excitations are required to achieve strong level repulsion and ergodic eigenstates.
ER  -

@Article{10.21468/SciPostPhys.15.1.022,
	title={{Chaos enhancement in large-spin chains}},
	author={Yael Lebel and Lea F. Santos and Yevgeny Bar Lev},
	journal={SciPost Phys.},
	volume={15},
	pages={022},
	year={2023},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.15.1.022},
	url={https://scipost.org/10.21468/SciPostPhys.15.1.022},
}