Graphene based superconducting quantum point contacts
| dc.creator | Moghaddam, Ali G. | |
| dc.creator | Zareyan, Malek | |
| dc.date | 2008-06-23 | |
| dc.date.accessioned | 2026-07-07T09:46:08Z | |
| dc.date.available | 2026-07-07T09:46:08Z | |
| dc.description | We investigate the Josephson effect in the graphene nanoribbons of length $L$ smaller than the superconducting coherence length and an arbitrary width $W$. We find that in contrast to an ordinary superconducting quantum point contact (SQPC) the critical supercurrent $I_c$ is not quantized for the nanoribbons with smooth and armchair edges. For a low concentration of the carriers $I_c$ decreases monotonically with lowering $W/L$ and tends to a constant minimum for a narrow nanoribbon with $W\lesssim L$. The minimum $I_c$ is zero for the smooth edges but $eΔ_{0}/\hbar$ for the armchair edges. At higher concentrations of the carriers this monotonic variation acquires a series of peaks. Further analysis of the current-phase relation and the Josephson coupling strength $I_cR_N$ in terms of $W/L$ and the concentration of carriers revels significant differences with those of an ordinary SQPC. On the other hand for a zigzag nanoribbon we find that, similar to an ordinary SQPC, $I_c$ is quantized but to the half-integer values $(n+1/2)4eΔ_{0}/\hbar$. | |
| dc.description | 8 pages, 5 figures | |
| dc.identifier | https://arxiv.org/abs/0806.3625 | |
| dc.identifier | http://arxiv.org/abs/0806.3625 | |
| dc.identifier | Appl. Phys. A 89, 579-585 (2007) | |
| dc.identifier | doi:10.1007/s00339-007-4187-2 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/163425 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.subject | Superconductivity | |
| dc.title | Graphene based superconducting quantum point contacts | |
| dc.type | text |