Chiral flat band superconductivity from symmetry-protected three-band crossings
We show that chiral (nearly) flat band superconductivity can develop and host novel Majorana fermions at a time-reversal pair of symmetry-protected three-band crossing points. Based on symmetry analysis, mean-field study, and superfluid stiffness calculation, we determine and analyze the irreducible...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2020-11-01
|
| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.043209 |
| _version_ | 1797211183546105856 |
|---|---|
| author | Yu-Ping Lin |
| author_facet | Yu-Ping Lin |
| author_sort | Yu-Ping Lin |
| collection | DOAJ |
| description | We show that chiral (nearly) flat band superconductivity can develop and host novel Majorana fermions at a time-reversal pair of symmetry-protected three-band crossing points. Based on symmetry analysis, mean-field study, and superfluid stiffness calculation, we determine and analyze the irreducible pairing channels with flat band pairings in the low-energy spin-1 fermion theory. Flat band pairing can enhance superconductivity dramatically, where the critical temperature scales linearly in the interaction strength. While fully gapped flat band pairing states develop in the single-component pairing channels, we find chiral p[over ¯]±ip[over ¯] flat band superconductivity in the multicomponent pairing channels. Three-dimensional itinerant Majorana fermions arise at the bulk nodal points, whereas Majorana arcs appear on the surface. |
| first_indexed | 2024-04-24T10:22:26Z |
| format | Article |
| id | doaj.art-15ea46b3bb4f40d18a274b1a78b9c938 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:22:26Z |
| publishDate | 2020-11-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-15ea46b3bb4f40d18a274b1a78b9c9382024-04-12T17:03:38ZengAmerican Physical SocietyPhysical Review Research2643-15642020-11-012404320910.1103/PhysRevResearch.2.043209Chiral flat band superconductivity from symmetry-protected three-band crossingsYu-Ping LinWe show that chiral (nearly) flat band superconductivity can develop and host novel Majorana fermions at a time-reversal pair of symmetry-protected three-band crossing points. Based on symmetry analysis, mean-field study, and superfluid stiffness calculation, we determine and analyze the irreducible pairing channels with flat band pairings in the low-energy spin-1 fermion theory. Flat band pairing can enhance superconductivity dramatically, where the critical temperature scales linearly in the interaction strength. While fully gapped flat band pairing states develop in the single-component pairing channels, we find chiral p[over ¯]±ip[over ¯] flat band superconductivity in the multicomponent pairing channels. Three-dimensional itinerant Majorana fermions arise at the bulk nodal points, whereas Majorana arcs appear on the surface.http://doi.org/10.1103/PhysRevResearch.2.043209 |
| spellingShingle | Yu-Ping Lin Chiral flat band superconductivity from symmetry-protected three-band crossings Physical Review Research |
| title | Chiral flat band superconductivity from symmetry-protected three-band crossings |
| title_full | Chiral flat band superconductivity from symmetry-protected three-band crossings |
| title_fullStr | Chiral flat band superconductivity from symmetry-protected three-band crossings |
| title_full_unstemmed | Chiral flat band superconductivity from symmetry-protected three-band crossings |
| title_short | Chiral flat band superconductivity from symmetry-protected three-band crossings |
| title_sort | chiral flat band superconductivity from symmetry protected three band crossings |
| url | http://doi.org/10.1103/PhysRevResearch.2.043209 |
| work_keys_str_mv | AT yupinglin chiralflatbandsuperconductivityfromsymmetryprotectedthreebandcrossings |