Personal tools
/ Research / Condensed Matter Physics / CMP Events / Slow Thermalization of Exact Quantum Many-Body Scar States Under Perturbations

Slow Thermalization of Exact Quantum Many-Body Scar States Under Perturbations

— filed under: ,
Date and time Oct 30, 2019
from 12:00 PM to 01:00 PM
Location 60 St. George Street, MP 606
Host Yong Baek Kim

Cheng-Ju Lin

Perimeter Institute for Theoretical Physics

Quantum many-body scar states are exceptional finite energy eigenstates in a thermalizing system that do not satisfy the eigenstate thermalization hypothesis. We investigate the fate of exact many-body scar states in the so-called PXP model for the Rydberg blockaded atom chain under perturbations. At small system sizes, deformed scar states described by perturbation theory survive. However, we argue for their eventual thermalization in the thermodynamic limit from the finite-size scaling of the off-diagonal matrix elements. Nevertheless, we show numerically and analytically that the nonthermal properties of the scars survive for a parametrically long time in quench experiments. We present a rigorous argument that lower-bounds the thermalization time for any scar state as t* ~ O(λ^(-1/(1+d))), where d is the spatial dimension of the system and λ is the perturbation strength.

Contact Name
Document Actions