Fermionic path integrals and correlation dynamics in a 1D XY system
| Autor: | I. Lyris, A. I. Karanikas, P. Lykourgias |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Quantum Physics 010308 nuclear & particles physics General Physics and Astronomy FOS: Physical sciences Context (language use) Classical XY model 01 natural sciences Consistency (statistics) 0103 physical sciences Path integral formulation Spin model Coherent states Limit (mathematics) Statistical physics 010306 general physics Focus (optics) Quantum Physics (quant-ph) |
| Popis: | We derive time dependent correlation functions in an one dimensional XY spin model with the use of generating functionals, the latter being defined as path integrals over fermionic coherent states. We focus on the proper construction of the aforementioned integrals in order to avoid the inconsistencies usually encountered in the literature. The static limit of our results successfully reproduces the known ones, confirming the validity of our construction and allowing for further investigation of the dynamics. In the same context, we examine the case of a general driven transverse magnetic field, for which case we derive formulas for the equal-time correlation functions and confirm the consistency of our results with the Kibble-Zurek mechanism. 1+34 pages, two appendices |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|