Torres-Herrera E J, Santos Lea F
Department of Physics, Yeshiva University, New York, New York 10016, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Jun;89(6):062110. doi: 10.1103/PhysRevE.89.062110. Epub 2014 Jun 9.
We study one-dimensional lattices of interacting spins-1/2 and show that the effects of quenching the amplitude of a local magnetic field applied to a single site of the lattice can be comparable to the effects of a global perturbation applied instantaneously to the entire system. Both quenches take the system to the chaotic domain, the energy distribution of the initial states approaches a Breit-Wigner shape, the fidelity (Loschmidt echo) decays exponentially, and thermalization becomes viable.
