期刊
ADVANCED QUANTUM TECHNOLOGIES
卷 4, 期 9, 页码 -出版社
WILEY
DOI: 10.1002/qute.202100067
关键词
erasable superconductivity; nematic superconductivity; topological insulators; voltage pulse
资金
- National Key Research & Development Program of China [2016YFA0300402, 2017YFA0303101, 2018YFC0810200]
- National Natural Science Foundation of China [11674279, 11374257, 21703204]
- Zhejiang Provincial Natural Science Foundation of China [LR18A04001]
- Key Research and Development Project of Zhejiang [2018C01048]
- Zhejiang Lab [2018EB0ZX01]
Experimental findings show that a new type of superconductivity can be observed at the point contacts of Bi2Se3 topological insulator, which can be erased through thermal cycles and induced again by applying voltage pulses at low temperatures, suggesting significance for designing new types of quantum devices.
3D topological insulators attract much attention due to their topologically protected Dirac surface states. Doping into topological insulators or their proximity with normal superconductors can promote the realization of topological superconductivity and Majorana fermions with potential applications in quantum computation. Here, an emergent superconductivity is observed in local mesoscopic point-contacts on the topological insulator Bi2Se3 by applying a voltage pulse through the contacts, evidenced by the Andreev reflection peak in the point-contact spectra and a visible resistance drop in the four-probe electrical resistance measurements. More intriguingly, the superconductivity can be erased with thermal cycles by warming up to high temperatures (300 K) and induced again by the voltage pulse at the base temperature (1.9 K), suggesting a significance for designing new types of quantum devices. Nematic behavior is also observed in the superconducting state, similar to the case of CuxBi2Se3 as topological superconductor candidates.
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