Multipartite entanglement at dynamical quantum phase transitions with nonuniformly spaced criticalities
| Autor: | Saptarshi Roy, Aditi Sen, Titas Chanda, Ujjwal Sen, Stav Haldar |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Quantum phase transition
Physics Quantum Physics Strongly Correlated Electrons (cond-mat.str-el) Field (physics) Phase (waves) FOS: Physical sciences 02 engineering and technology Quantum entanglement 021001 nanoscience & nanotechnology 01 natural sciences Multipartite entanglement Condensed Matter - Other Condensed Matter Condensed Matter - Strongly Correlated Electrons Quantum Gases (cond-mat.quant-gas) Critical line Quantum mechanics 0103 physical sciences Gravitational singularity Ising model Condensed Matter - Quantum Gases Quantum Physics (quant-ph) 010306 general physics 0210 nano-technology Other Condensed Matter (cond-mat.other) |
| Zdroj: | Physical Review B. 101 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.101.224304 |
| Popis: | We report dynamical quantum phase transition portrait in the alternating field transverse XY spin chain with Dzyaloshinskii-Moriya interaction by investigating singularities in the Loschmidt echo and the corresponding rate function after a sudden quench of system parameters. Unlike the Ising model, the analysis of Loschmidt echo yields non-uniformly spaced transition times in this model. Comparative study between the equilibrium and the dynamical quantum phase transitions in this case reveals that there are quenches where one occurs without the other, and the regimes where they co-exist. However, such transitions happen only when quenching is performed across at least a single gapless or critical line. Contrary to equilibrium phase transitions, bipartite entanglement measures do not turn out to be useful for the detection, while multipartite entanglement emerges as a good identifier of this transition when the quench is done from a disordered phase of this model. Comment: 10 pages, 6 figures; close to published version |
| Databáze: | OpenAIRE |
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