Skip to main content
placeholder image

Fully gapped topological surface states in Bi2Se3 films induced by a d-wave high-temperature superconductor

Journal Article


Abstract


  • Topological insulators are a new class of material1,2

    , that exhibit

    robust gapless surface states protected by time-reversal

    symmetry3,4

    . 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 fermions5

    ,

    and Majorana zero modes6

    that may find application in faulttolerant

    quantum computation7,8

    . Inducing superconductivity

    on the topological surface states is a prerequisite for their

    experimental realization1,2

    . 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

UOW Authors


  •   Wang, Eryin (external author)
  •   Ding, Hao (external author)
  •   Fedorov, Alexei V. (external author)
  •   Yao, Wei (external author)
  •   Li, Zhi
  •   Lv, Yan-Feng (external author)
  •   Zhao, Kun (external author)
  •   Zhang, Li-Guo (external author)
  •   Xu, Zhijun (external author)
  •   Schneeloch, John (external author)
  •   Zhong, Ruidan (external author)
  •   Ji, Shuaihua (external author)
  •   Wang, Lili (external author)
  •   He, Ke (external author)
  •   Ma, Xu-Cun (external author)
  •   Gu, Genda (external author)
  •   Yao, Hong (external author)
  •   Xue, Qi-Kun (external author)
  •   Chen, Xi (external author)
  •   Zhou, Shuyun (external author)

Publication Date


  • 2013

Citation


  • Wang, E., Ding, H., Fedorov, A. V., Yao, W., Li, Z., Lv, Y., Zhao, K., Zhang, L., Xu, Z., Schneeloch, J., Zhong, R., Ji, S., Wang, L., He, K., Ma, X., Gu, G., Yao, H., Xue, Q., Chen, X. & Zhou, S. (2013). Fully gapped topological surface states in Bi2Se3 films induced by a d-wave high-temperature superconductor. Nature Physics, 9 621-625.

Scopus Eid


  • 2-s2.0-84885432762

Number Of Pages


  • 4

Start Page


  • 621

End Page


  • 625

Volume


  • 9

Place Of Publication


  • United Kingdom

Abstract


  • Topological insulators are a new class of material1,2

    , that exhibit

    robust gapless surface states protected by time-reversal

    symmetry3,4

    . 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 fermions5

    ,

    and Majorana zero modes6

    that may find application in faulttolerant

    quantum computation7,8

    . Inducing superconductivity

    on the topological surface states is a prerequisite for their

    experimental realization1,2

    . 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

UOW Authors


  •   Wang, Eryin (external author)
  •   Ding, Hao (external author)
  •   Fedorov, Alexei V. (external author)
  •   Yao, Wei (external author)
  •   Li, Zhi
  •   Lv, Yan-Feng (external author)
  •   Zhao, Kun (external author)
  •   Zhang, Li-Guo (external author)
  •   Xu, Zhijun (external author)
  •   Schneeloch, John (external author)
  •   Zhong, Ruidan (external author)
  •   Ji, Shuaihua (external author)
  •   Wang, Lili (external author)
  •   He, Ke (external author)
  •   Ma, Xu-Cun (external author)
  •   Gu, Genda (external author)
  •   Yao, Hong (external author)
  •   Xue, Qi-Kun (external author)
  •   Chen, Xi (external author)
  •   Zhou, Shuyun (external author)

Publication Date


  • 2013

Citation


  • Wang, E., Ding, H., Fedorov, A. V., Yao, W., Li, Z., Lv, Y., Zhao, K., Zhang, L., Xu, Z., Schneeloch, J., Zhong, R., Ji, S., Wang, L., He, K., Ma, X., Gu, G., Yao, H., Xue, Q., Chen, X. & Zhou, S. (2013). Fully gapped topological surface states in Bi2Se3 films induced by a d-wave high-temperature superconductor. Nature Physics, 9 621-625.

Scopus Eid


  • 2-s2.0-84885432762

Number Of Pages


  • 4

Start Page


  • 621

End Page


  • 625

Volume


  • 9

Place Of Publication


  • United Kingdom