Topological Superconductivity in CuxBi2Se3

By S. Sasaki, M. Kriener, K. Segawa, K. Yada, Yukio Tanaka, Masatoshi Sato, Y. Ando. 2011

275 citations recorded by the source corpus.

A topological superconductor (TSC) is characterized by the topologically-protected gapless surface state that is essentially an Andreev bound state consisting of Majorana fermions. While a TSC has not yet been discovered, the doped topological insulator CuxBi2Se3, which superconducts below ~3 K, has been predicted to possess a topological superconducting state. We report that the point-contact spectra on the cleaved surface of superconducting CuxBi2Se3 present a zero-bias conductance peak (ZBCP) which signifies unconventional superconductivity. Theoretical considerations of all possible superconducting states help us conclude that this ZBCP is due to Majorana Fermions and gives evidence for a topological superconductivity in CuxBi2Se3. In addition, we found an unusual pseudogap that develops below ~20 K and coexists with the topological superconducting state.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/db8d479da557b5b93941dbec81eea82c0da00dba

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

1. Y. Ando
2. Masatoshi Sato
3. Su-Yang Xu
4. M. Zahid Hasan
5. G. Bian
6. Chen Fang
7. Nitin Samarth
8. I. Belopolski

In Condensed Matter Physics

1. Y. Ando
2. Masatoshi Sato
3. Su-Yang Xu
4. Chen Fang
5. M. Zahid Hasan
6. G. Bian
7. Masahito Ueda

In Materials Chemistry

1. Y. Ando
2. Masatoshi Sato
3. Su-Yang Xu
4. G. Bian
5. Chen Fang
6. M. Zahid Hasan
7. Nitin Samarth
8. I. Belopolski

Citations in the corpus

• Topological superconductors: a review (2016, background): “With the recent confirmations of the topological ∆4 state in CuxBi2Se3 [193, 194], Majorana teleportation in InAs/Al nanowire [249], and the 4π-periodic Josephson effect in HgTe/Nb junction [244], concrete platforms for exploring the physics of topological superconductivity are being established.”
• Momentum-space imaging of Cooper pairing in a half-Dirac-gas topological superconductor (2014, background): “• Complicated Origin of Zero Bias Conductance Peak in Transport: Recently, zero-bias conductance peak has been observed in transport measurements [27, 38],”