Unified picture of superfluidity: From Bogoliubov's approximation to Popov's hydrodynamic theory
| dc.creator | Dupuis, N. | |
| dc.date | 2009-01-29 | |
| dc.date | 2009-05-22 | |
| dc.date.accessioned | 2026-07-07T13:17:01Z | |
| dc.date.available | 2026-07-07T13:17:01Z | |
| dc.description | Using a non-perturbative renormalization-group technique, we compute the momentum and frequency dependence of the anomalous self-energy and the one-particle spectral function of two-dimensional interacting bosons at zero temperature. Below a characteristic momentum scale $k_G$, where the Bogoliubov approximation breaks down, the anomalous self-energy develops a square root singularity and the Goldstone mode of the superfluid phase (Bogoliubov sound mode) coexists with a continuum of excitations, in agreement with the predictions of Popov's hydrodynamic theory. Thus our results provide a unified picture of superfluidity in interacting boson systems and connect Bogoliubov's theory (valid for momenta larger than $k_G$) to Popov's hydrodynamic approach. | |
| dc.description | v2) 4 pages, 4 figures v3) Revised title + minor changes | |
| dc.identifier | https://arxiv.org/abs/0901.4631 | |
| dc.identifier | http://arxiv.org/abs/0901.4631 | |
| dc.identifier | Phys. Rev. Lett. 102, 190401 (2009) | |
| dc.identifier | doi:10.1103/PhysRevLett.102.190401 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/230976 | |
| dc.subject | Other Condensed Matter | |
| dc.title | Unified picture of superfluidity: From Bogoliubov's approximation to Popov's hydrodynamic theory | |
| dc.type | text |