| Autor: |
Wang, Eryin, Ding, Hao, Fedorov, Alexei V., Yao, Wei, Li, Zhi, Lv, Yan-Feng, Zhao, Kun, Zhang, Li-Guo, Xu, Zhijun, Schneeloch, John, Zhong, Ruidan, Ji, Shuai-Hua, Wang, Lili, He, Ke, Ma, Xucun, Gu, Genda, Yao, Hong, Xue, Qi-Kun, Chen, Xi, Zhou, Shuyun |
| Předmět: |
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| Zdroj: |
Nature Physics; Oct2013, Vol. 9 Issue 10, p621-625, 5p |
| Abstrakt: |
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] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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