Superconducting topological surface states in the noncentrosymmetric bulk superconductor PbTaSe2

被引:151
|
作者
Guan, Syu-You [1 ,2 ]
Chen, Peng-Jen [1 ,2 ,3 ]
Chu, Ming-Wen [4 ]
Sankar, Raman [2 ,4 ]
Chou, Fangcheng [4 ]
Jeng, Horng-Tay [2 ,5 ]
Chang, Chia-Seng [1 ,2 ]
Chuang, Tien-Ming [2 ]
机构
[1] Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan
[2] Acad Sinica, Inst Phys, Taipei 11529, Taiwan
[3] Acad Sinica, Taiwan Int Grad Program, Nano Sci & Technol Program, Taipei 11529, Taiwan
[4] Natl Taiwan Univ, Ctr Condensed Matter Sci, Taipei 10617, Taiwan
[5] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan
来源
SCIENCE ADVANCES | 2016年 / 2卷 / 11期
关键词
QUASI-PARTICLE INTERFERENCE; MAJORANA FERMIONS; INSULATORS; TEXTURE;
D O I
10.1126/sciadv.1600894
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The search for topological superconductors (TSCs) is one of the most urgent contemporary problems in condensed matter systems. TSCs are characterized by a full superconducting gap in the bulk and topologically protected gapless surface (or edge) states. Within each vortex core of TSCs, there exists the zero-energy Majorana bound states, which are predicted to exhibit non-Abelian statistics and to form the basis of the fault-tolerant quantum computation. To date, no stoichiometric bulk material exhibits the required topological surface states (TSSs) at the Fermi level (E-F) combined with fully gapped bulk superconductivity. We report atomic-scale visualization of the TSSs of the noncentrosymmetric fully gapped superconductor PbTaSe2. Using quasi-particle scattering interference imaging, we find two TSSs with a Dirac point at E congruent to 1.0 eV, of which the inner TSS and the partial outer TSS cross E-F, on the Pb-terminated surface of this fully gapped superconductor. This discovery reveals PbTaSe2 as a promising candidate for TSC.
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页数:8
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