| Full text | |
| Author(s): |
Madeira, Lucas
[1]
;
Garcia-Orozco, Arnol Daniel
[1]
;
dos Santos, Francisco Ednilson Alves
[2]
;
Bagnato, Vanderlei Salvador
[1, 3]
Total Authors: 4
|
| Affiliation: | [1] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos - Brazil
[3] Texas A&M Univ, Dept Biomed Engn, College Stn, TX 77843 - USA
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | Entropy; v. 22, n. 9 SEP 2020. |
| Web of Science Citations: | 1 |
| Abstract | |
Quantum turbulence deals with the phenomenon of turbulence in quantum fluids, such as superfluid helium and trapped Bose-Einstein condensates (BECs). Although much progress has been made in understanding quantum turbulence, several fundamental questions remain to be answered. In this work, we investigated the entropy of a trapped BEC in several regimes, including equilibrium, small excitations, the onset of turbulence, and a turbulent state. We considered the time evolution when the system is perturbed and let to evolve after the external excitation is turned off. We derived an expression for the entropy consistent with the accessible experimental data, which is, using the assumption that the momentum distribution is well-known. We related the excitation amplitude to different stages of the perturbed system, and we found distinct features of the entropy in each of them. In particular, we observed a sudden increase in the entropy following the establishment of a particle cascade. We argue that entropy and related quantities can be used to investigate and characterize quantum turbulence. (AU) | |
| FAPESP's process: | 18/09191-7 - Vortices and turbulence in strongly interacting quantum fluids and their mixtures |
| Grantee: | Lucas Madeira |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 13/07276-1 - CEPOF - Optics and Photonic Research Center |
| Grantee: | Vanderlei Salvador Bagnato |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |
| FAPESP's process: | 14/50857-8 - National Institute in Basic Optics and Applied to Life Sciences |
| Grantee: | Vanderlei Salvador Bagnato |
| Support Opportunities: | Research Projects - Thematic Grants |