Competing many-body instabilities and unconventional superconductivity in graphene
| Autor: | Maximilian L. Kiesel, Ronny Thomale, Werner Hanke, Christian Platt, Dmitry A. Abanin |
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| Rok vydání: | 2012 |
| Předmět: |
Superconductivity
Physics Condensed matter physics Graphene Condensed Matter - Superconductivity FOS: Physical sciences Charge (physics) Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Superconductivity (cond-mat.supr-con) law Condensed Matter::Superconductivity Quantum mechanics Coulomb Density of states Functional renormalization group Phase diagram Spin-½ |
| Zdroj: | Physical Review B. 86 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.86.020507 |
| Popis: | The band structure of graphene exhibits van Hove singularities (VHS) at doping x=+- 1/8 away from the Dirac point. Near the VHS, interactions effects, enhanced due to the large density of states, can give rise to various many-body phases at experimentally accessible temperatures. We study the competition between different many-body instabilities in graphene using functional renormalization group (FRG). We predict a rich phase diagram, which, depending on long range hopping as well as screening strength and absolute scale of the Coulomb interaction, contains a d+id-wave superconducting (SC) phase, or a spin density wave phase at the VHS. The d+id state is expected to exhibit quantized charge and spin Hall response, as well as Majorana modes bound to vortices. In the vicinity of the VHS, we find singlet d+id-wave as well as triplet f-wave SC phases. 4.5 pages, 4 figures |
| Databáze: | OpenAIRE |
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