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Fully gapped topological surface states in Bi2Se3 films induced by a d-wave high-temperature superconductor.
- Source :
-
Nature Physics . Oct2013, Vol. 9 Issue 10, p621-625. 5p. - Publication Year :
- 2013
-
Abstract
- Topological insulators are a new class of material, that exhibit robust gapless surface states protected by time-reversal symmetry. The interplay of such symmetry-protected topological surface states and symmetry-broken states (for example, superconductivity) provides a platform for exploring new quantum phenomena and functionalities, such as one-dimensional chiral or helical gapless Majorana fermions, and Majorana zero modes that may find application in fault-tolerant quantum computation. Inducing superconductivity on the topological surface states is a prerequisite for their experimental realization. Here, by growing high-quality topological insulator Bi2Se3 films on a d-wave superconductor Bi2Sr2CaCu2O8+δ using molecular beam epitaxy, we are able to induce high-temperature superconductivity on the surface states of Bi2Se3 films with a large pairing gap up to 15 meV. Interestingly, distinct from the d-wave pairing of Bi2Sr2CaCu2O8+δ, the proximity-induced gap on the surface states is nearly isotropic and consistent with predominant s-wave pairing as revealed by angle-resolved photoemission spectroscopy. Our work could provide a critical step towards the realization of the long sought Majorana zero modes. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 17452473
- Volume :
- 9
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Nature Physics
- Publication Type :
- Academic Journal
- Accession number :
- 90493202
- Full Text :
- https://doi.org/10.1038/nphys2744