Boundary effects on quantum q-breathers in a Bose-Hubbard chain
| dc.creator | Pinto, Ricardo A. | |
| dc.creator | Nguenang, Jean Pierre | |
| dc.creator | Flach, Sergej | |
| dc.date | 2008-10-15 | |
| dc.date | 2009-01-19 | |
| dc.date.accessioned | 2026-07-07T12:30:55Z | |
| dc.date.available | 2026-07-07T12:30:55Z | |
| dc.description | We investigate the spectrum and eigenstates of a Bose-Hubbard chain containing two bosons with fixed boundary conditions. In the noninteracting case the eigenstates of the system define a two-dimensional normal-mode space. For the interacting case weight functions of the eigenstates are computed by perturbation theory and numerical diagonalization. We identify paths in the two-dimensional normal-mode space which are rims for the weight functions. The decay along and off the rims is algebraic. Intersection of two paths (rims) leads to a local enhancement of the weight functions. We analyze nonperturbative effects due to the degeneracies and the formation of two-boson bound states. | |
| dc.description | 10 pages, 11 figures. With minor corrections. Accepted in Physica D | |
| dc.identifier | https://arxiv.org/abs/0810.2655 | |
| dc.identifier | http://arxiv.org/abs/0810.2655 | |
| dc.identifier | doi:10.1016/j.physd.2008.12.013 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/216285 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.subject | Other Condensed Matter | |
| dc.title | Boundary effects on quantum q-breathers in a Bose-Hubbard chain | |
| dc.type | text |