Details

Autor(en) / Beteiligte

• Liu, Qin
• Chen, Chen
• Zhang, Tong
• Peng, Rui
• Yan, Ya-Jun
• Wen, Chen-Hao-Ping
• Lou, Xia
• Huang, Yu-Long
• Tian, Jin-Peng
• Dong, Xiao-Li
• Wang, Guang-Wei
• Bao, Wei-Cheng
• Wang, Qiang-Hua
• Yin, Zhi-Ping
• Zhao, Zhong-Xian
• Feng, Dong-Lai

Titel

Robust and Clean Majorana Zero Mode in the Vortex Core of High-Temperature Superconductor ( Li 0.84 Fe 0.16 ) OHFeSe

Ist Teil von

• Physical review. X, 2018-12, Vol.8 (4), p.041056, Article 041056

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The Majorana fermion, which is its own antiparticle and obeys non-Abelian statistics, plays a critical role in topological quantum computing. It can be realized as a bound state at zero energy, called a Majorana zero mode (MZM), in the vortex core of a topological superconductor, or at the ends of a nanowire when both superconductivity and strong spin orbital coupling are present. A MZM can be detected as a zero-bias conductance peak (ZBCP) in tunneling spectroscopy. However, in practice, clean and robust MZMs have not been realized in the vortices of a superconductor because of contamination from impurity states or other closely packed Caroli–de Gennes-Matricon (CdGM) states, which hampers further manipulations of MZMs. Here, using scanning tunneling spectroscopy, we show that a ZBCP well separated from the other discrete CdGM states exists ubiquitously in the cores of free vortices in the defect-free regions of(Li0.84Fe0.16)OHFeSe, which has a superconducting transition temperature of 42 K. Moreover, a Dirac-cone-type surface state is observed by angle-resolved photoemission spectroscopy, and its topological nature is confirmed by band calculations. The observed ZBCP can naturally be attributed to a MZM arising from the chiral topological surface state of a bulk superconductor. Thus,(Li0.84Fe0.16)OHFeSeprovides an ideal platform for studying MZMs and topological quantum computing.