Bibliographic Details
| Title: |
Mean-field theory for superconductivity in twisted bilayer graphene |
| Authors: |
Peltonen, T. J., Ojajärvi, R., Heikkilä, T. T. |
| Source: |
Phys. Rev. B 98, 220504 (2018) |
| Publication Year: |
2018 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Superconductivity |
| More Details: |
Recent experiments show how a bilayer graphene twisted around a certain magic angle becomes superconducting as it is doped into a region with approximate flat bands. We investigate the mean-field $s$-wave superconducting state in such a system and show how the state evolves as the twist angle is tuned, and as a function of the doping level. We argue that part of the experimental findings could well be understood to result from an attractive electron--electron interaction mediated by electron--phonon coupling, but the flat-band nature of the excitation spectrum makes also superconductivity quite unusual. For example, as the flat-band states are highly localized around certain spots in the structure, also the superconducting order parameter becomes strongly inhomogeneous.
Comment: 5+5 pages, 5+1 figures |
| Document Type: |
Working Paper |
| DOI: |
10.1103/PhysRevB.98.220504 |
| Access URL: |
http://arxiv.org/abs/1805.01039 |
| Accession Number: |
edsarx.1805.01039 |
| Database: |
arXiv |
