Interplay between topological insulators and superconductors

Jian Wang, Cui Zu Chang, Handong Li, Ke He, Duming Zhang, Meenakshi Singh, Xu Cun Ma, Nitin Samarth, Maohai Xie, Qi Kun Xue, M. H.W. Chan

Research output: Contribution to journalArticle

42 Scopus citations

Abstract

Topological insulators are insulating in the bulk but possess metallic surface states protected by time-reversal symmetry. Here, we report on a detailed electronic transport study in high-quality Bi 2Se 3 topological insulator thin films contacted by superconducting (In, Al, and W) electrodes. The resistance of the film shows an abrupt and significant upturn when the electrodes become superconducting. In turn, the Bi 2Se 3 film greatly weakens the superconductivity of the electrodes, significantly reducing both their transition temperatures and their critical fields. A possible interpretation of these results is that the superconducting electrodes are accessing the surface states and the experimental results are consequences of the interplay between the Cooper pairs of the electrodes and the spin-polarized current of the surface states in Bi 2Se 3.

Original languageEnglish (US)
Article number045415
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number4
DOIs
StatePublished - Jan 10 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Wang, J., Chang, C. Z., Li, H., He, K., Zhang, D., Singh, M., Ma, X. C., Samarth, N., Xie, M., Xue, Q. K., & Chan, M. H. W. (2012). Interplay between topological insulators and superconductors. Physical Review B - Condensed Matter and Materials Physics, 85(4), [045415]. https://doi.org/10.1103/PhysRevB.85.045415