Discrete energy levels of Caroli-de Gennes-Matricon states in quantum limit in FeTe0.55Se0.45

被引：97

作者：

Chen, Mingyang ^{[1
,2
]}

Chen, Xiaoyu ^{[1
,2
]}

Yang, Huan ^{[1
,2
]}

Du, Zengyi ^{[1
,2
]}

Zhu, Xiyu ^{[1
,2
]}

Wang, Enyu ^{[1
,2
]}

Wen, Hai-Hu ^{[1
,2
]}

机构：

[1] Nanjing Univ, Natl Lab Solid State Microstruct, Ctr Superconducting Phys & Mat, Nanjing 210093, Jiangsu, Peoples R China

[2] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China

来源：

NATURE COMMUNICATIONS | 2018年 / 9卷

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

SCANNING-TUNNELING-MICROSCOPE; DENSITY-OF-STATES; VORTEX-CORE; ELECTRONIC-STRUCTURE; II SUPERCONDUCTOR; BOUND-STATES; BI2SR2CACU2O8+DELTA; YBA2CU3O7-DELTA; SPECTROSCOPY; LATTICE;

D O I：

10.1038/s41467-018-03404-8

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：

Caroli-de Gennes-Matricon (CdGM) states were predicted in 1964 as low-energy excitations within vortex cores of type-II superconductors. In the quantum limit, the energy levels of these states were predicted to be discrete with the basic levels at +/-mu Delta(2)/E-F (mu = 1/2, 3/2, 5/2, ...) with. the superconducting energy gap and E-F the Fermi energy. However, due to the small ratio of Delta/EF in most type-II superconductors, it is very difficult to observe the discrete CdGM states, but rather a symmetric peak which appears at zero bias at the vortex center. Here we report the clear observation of these discrete energy levels of CdGM states in FeTe0.55Se0.45. The rather stable energies of these bound state peaks vs. space clearly validate our conclusion. Analysis based on the energies of these CdGM states indicates that the Fermi energy in the present system is very small.

引用

页数：7

共 30 条

[1] Observation of Caroli-de Gennes-Matricon Vortex States in YBa2Cu3O7-δ [J].