Bandyopadhyay, SouvikPolkovnikov, AnatoliDutta, Amit2023-07-202023-07-202021S. Bandyopadhyay, A. Polkovnikov, A. Dutta. 2021. "Observing Dynamical Quantum Phase Transitions through Quasilocal String Operators" Physical Review Letters, Volume 126, Issue 20. https://doi.org/10.1103/physrevlett.126.2006020031-90071079-7114https://hdl.handle.net/2144/46472We analyze signatures of the dynamical quantum phase transitions in physical observables. In particular, we show that both the expectation value and various out of time order correlation functions of the finite length product or string operators develop cusp singularities following quench protocols, which become sharper and sharper as the string length increases. We illustrated our ideas analyzing both integrable and nonintegrable one-dimensional Ising models showing that these transitions are robust both to the details of the model and to the choice of the initial state.en© 2021 American Physical Society.Mathematical sciencesPhysical sciencesEngineeringGeneral physicsArticle2023-02-0810.1103/physrevlett.126.2006020000-0002-4669-5536 (Bandyopadhyay, Souvik)0000-0002-5549-7400 (Polkovnikov, Anatoli)722170