Kavli Affiliate: Joel E. Moore
| First 5 Authors: Julia Wei, Julia Wei, , ,
| Summary:
Measuring universal data in the strongly correlated regime of quantum
critical points remains a fundamental objective for quantum simulators. In
foundational work, Calabrese and Cardy demonstrated how this data governs the
dynamics of certain global quenches to 1+1-dimensional conformal field
theories. While the quasiparticle picture they introduce has been widely
successful in both theory and experiment, their seminal prediction that the
critical exponents are simply encoded in the relaxation rates of local
observables is more challenging to investigate experimentally; in particular,
the specific initial state required for their analysis is generated via
imaginary time evolution. In this work, we examine the critical quench dynamics
of local observables from two types of readily-accessible initial conditions:
ground states and finite-temperature ensembles. We identify universal scaling
collapses and scaling functions in both cases, utilizing a combination of
conformal perturbation theory and tensor network numerics. For the
finite-temperature quenches, we determine a regime in which the conformal field
theory results are recovered, thereby allowing universal quantum critical data
to be extracted from realistic quenches.
| Search Query: ArXiv Query: search_query=au:”Joel E. Moore”&id_list=&start=0&max_results=3