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28 March 2024 |
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The Coexistence of Superconductivity and Topological Order in the Bi2Se3 Thin Films | Mei-Xiao Wang
; Canhua Liu
; Jin-Peng Xu
; Fang Yang
; Lin Miao
; Meng-Yu Yao
; C. L. Gao
; Chenyi Shen
; Xucun Ma
; X. Chen
; Zhu-An Xu
; Ying Liu
; Shou-Cheng Zhang
; Dong Qian
; Jin-Feng Jia
; Qi-Kun Xue
; | Date: |
8 Dec 2011 | Abstract: | Three-dimensional topological insulators (TIs) are characterized by their
nontrivial surface states in which electrons have their spin locked at a right
angle to their momentum under the protection of time reversal symmetry.
Topologically ordered phase in TIs does not break any symmetry. The interplay
between topological order and symmetry breaking such as superconductivity can
lead to new quantum phenomena and devices. However, the existence of the
superconducting states (Cooper pairs) in TI’s surface has not been obtained to
date experimentally. Here, we report for the first time the realization of a
superconducting TI/Superconductor (SC) heterostructure characterized with
Cooper pairs tunneling into TI through superconducting proximity effect, by
successful growing Bi2Se3 thin films on superconductor NbSe2 substrate. Using
scanning tunneling microscopy and angle-resolved photoemission spectroscopy, we
unambiguously observed the Cooper pairs at Bi2Se3 surface (Bi2Se3/NbSe2
interface) where topological surface states form. This observation lays the
groundwork for experimentally realizing Majorana Fermions in condensed matter
physics. | Source: | arXiv, 1112.1772 | Services: | Forum | Review | PDF | Favorites |
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