Absence of fermionic quasi-particles in the superfluid state of the attractive Fermi gas
| dc.creator | Lerch, Nils | |
| dc.creator | Bartosch, Lorenz | |
| dc.creator | Kopietz, Peter | |
| dc.date | 2007-10-09 | |
| dc.date | 2007-11-29 | |
| dc.date.accessioned | 2026-07-07T09:18:56Z | |
| dc.date.available | 2026-07-07T09:18:56Z | |
| dc.description | We calculate the effect of order parameter fluctuations on the fermionic single-particle excitations in the superfluid state of neutral fermions interacting with short range attractive forces. We show that in dimensions D \leq 3 the singular effective interaction between the fermions mediated by the gapless Bogoliubov-Anderson mode prohibits the existence of well-defined quasi-particles. We explicitly calculate the single-particle spectral function in the BEC regime in D=3 and show that in this case the quasi-particle residue and the density of states are logarithmically suppressed. | |
| dc.description | 4 RevTex pages, 3 figures; title changed, new Figure 1, added references. We argue that in the entire regime of the BCS-BEC crossover the quasi-particle picture breaks down in D <=3 for neutral fermions (but NOT for charged fermions) | |
| dc.identifier | https://arxiv.org/abs/0710.1801 | |
| dc.identifier | http://arxiv.org/abs/0710.1801 | |
| dc.identifier | Phys. Rev. Lett. 100, 050403 (2008) | |
| dc.identifier | doi:10.1103/PhysRevLett.100.050403 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/154208 | |
| dc.subject | Superconductivity | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Absence of fermionic quasi-particles in the superfluid state of the attractive Fermi gas | |
| dc.type | text |