Quantum criticality and dynamical instability in the kicked top
Quantum Physics
2014-04-23 v2 Quantum Gases
Chaotic Dynamics
Abstract
We investigate precursors of critical behavior in the quasienergy spectrum due to the dynamical instability in the kicked top. Using a semiclassical approach, we analytically obtain a logarithmic divergence in the density of states, which is analogous to a continuous excited state quantum phase transition in undriven systems. We propose a protocol to observe the cusp behavior of the magnetization close to the critical quasienergy.
Cite
@article{arxiv.1308.5640,
title = {Quantum criticality and dynamical instability in the kicked top},
author = {V. M. Bastidas and P. Perez-Fernandez and M. Vogl and T. Brandes},
journal= {arXiv preprint arXiv:1308.5640},
year = {2014}
}
Comments
5 pages, 3 figures, and supplementary information. Comments are welcome