Diamagnetism of doped two-leg ladders and probing the nature of their commensurate phases
| dc.creator | Roux, G. | |
| dc.creator | Orignac, E. | |
| dc.creator | White, S. R. | |
| dc.creator | Poilblanc, D. | |
| dc.date | 2007-07-20 | |
| dc.date | 2007-11-05 | |
| dc.date.accessioned | 2026-07-07T08:40:01Z | |
| dc.date.available | 2026-07-07T08:40:01Z | |
| dc.description | We study the magnetic orbital effect of a doped two-leg ladder in the presence of a magnetic field component perpendicular to the ladder plane. Combining both low-energy approach (bosonization) and numerical simulations (density-matrix renormalization group) on the strong coupling limit (t-J model), a rich phase diagram is established as a function of hole doping and magnetic flux. Above a critical flux, the spin gap is destroyed and a Luttinger liquid phase is stabilized. Above a second critical flux, a reentrance of the spin gap at high magnetic flux is found. Interestingly, the phase transitions are associated with a change of sign of the orbital susceptibility. Focusing on the small magnetic field regime, the spin-gapped superconducting phase is robust but immediately acquires algebraic transverse (i.e. along rungs) current correlations which are commensurate with the 4k_F density correlations. In addition, we have computed the zero-field orbital susceptibility for a large range of doping and interactions ratio J/t : we found strong anomalies at low J/t only in the vicinity of the commensurate fillings corresponding to delta = 1/4 and 1/2. Furthermore, the behavior of the orbital susceptibility reveals that the nature of these insulating phases is different: while for delta = 1/4 a 4k_F charge density wave is confirmed, the delta = 1/2 phase is shown to be a bond order wave. | |
| dc.description | 15 pages, 17 figures | |
| dc.identifier | https://arxiv.org/abs/0707.3017 | |
| dc.identifier | http://arxiv.org/abs/0707.3017 | |
| dc.identifier | Phys. Rev. B 76, 195105 (2007) | |
| dc.identifier | doi:10.1103/PhysRevB.76.195105 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/141272 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Superconductivity | |
| dc.title | Diamagnetism of doped two-leg ladders and probing the nature of their commensurate phases | |
| dc.type | text |