Quasiparticle origin of dynamical quantum phase transitions

Autor:	Halimeh, Jad C., Van Damme, Maarten, Zauner-Stauber, Valentin, Vanderstraeten, Laurens
Rok vydání:	2018
Předmět:	Condensed Matter - Strongly Correlated Electrons Condensed Matter - Quantum Gases Condensed Matter - Statistical Mechanics Quantum Physics
Zdroj:	Phys. Rev. Research 2, 033111 (2020)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevResearch.2.033111
Popis:	Considering nonintegrable quantum Ising chains with exponentially decaying interactions, we present matrix product state results that establish a connection between low-energy quasiparticle excitations and the kind of nonanalyticities in the Loschmidt return rate. When domain walls in the spectrum of the quench Hamiltonian are energetically favored to be bound rather than freely propagating, anomalous cusps appear in the return rate regardless of the initial state. In the nearest-neighbor limit, domain walls are always freely propagating, and anomalous cusps never appear. As a consequence, our work illustrates that models in the same equilibrium universality class can still exhibit fundamentally distinct out-of-equilibrium criticality. Our results are accessible to current ultracold-atom and ion-trap experiments. Comment: 9 pages, 8 figures, accepted version
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1810.07187 Zobrazit plný text záznamu View this record from Arxiv