Experimental evidence of anomalously large superconducting gap on topological surface state of beta-Bi2Pd film

doi:10.1016/j.scib.2019.07.019

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Experimental evidence of anomalously large superconducting gap on topological surface state of beta-Bi2Pd film
	Guan, JY ; Kong, LY ; Zhou, LQ ; Zhong, YG ; Li, H ; Liu, HJ ; Tang, CY ; Yan, DY ; Yang, FZ ; Huang, YB
刊名	SCIENCE BULLETIN
	2019
卷号	64 期号:17 页码:1215-1221
关键词	MAJORANA FERMIONS BOUND-STATE ZERO MODES BI2SE3 ORDER
ISSN号	2095-9273
DOI	10.1016/j.scib.2019.07.019
文献子类	期刊论文
英文摘要	Connate topological superconductor (TSC) combines topological surface states with nodeless superconductivity in a single material, achieving effective p-wave pairing without interface complication. By combining angle-resolved photoemission spectroscopy and in-situ molecular beam epitaxy, we studied the momentum-resolved superconductivity in beta-Bi2Pd film. We found that the superconducting gap of topological surface state (Delta(TSS) similar to 3.8 meV) is anomalously enhanced from its bulk value (Delta(b) similar to 0.8 meV). The ratio of 2 Delta TSS/k(B)Tc similar to 16.3, is substantially larger than the BCS value. By measuring beta-Bi2Pd bulk single crystal as a comparison, we clearly observed the upward-shift of chemical potential in the film. In addition, a concomitant increasing of surface weight on the topological surface state was revealed by our first principle calculation, suggesting that the Dirac-fermion-mediated parity mixing may cause this anomalous superconducting enhancement. Our results establish beta-Bi2Pd film as a unique case of connate TSCs with a highly enhanced topological superconducting gap, which may stabilize Majorana zero modes at a higher temperature. (C) 2019 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/32052]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China; 2.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China; 3.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China; 4.Univ Chinese Acad Sci, Sch Phys, Beijing 100190, Peoples R China; 5.Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing 100190, Peoples R China; 6.Songshan Lake Mat Lab, Dongguan 523808, Peoples R China
推荐引用方式 GB/T 7714	Guan, JY,Kong, LY,Zhou, LQ,et al. Experimental evidence of anomalously large superconducting gap on topological surface state of beta-Bi2Pd film[J]. SCIENCE BULLETIN,2019,64(17):1215-1221.
APA	Guan, JY.,Kong, LY.,Zhou, LQ.,Zhong, YG.,Li, H.,...&Ding, H.(2019).Experimental evidence of anomalously large superconducting gap on topological surface state of beta-Bi2Pd film.SCIENCE BULLETIN,64(17),1215-1221.
MLA	Guan, JY,et al."Experimental evidence of anomalously large superconducting gap on topological surface state of beta-Bi2Pd film".SCIENCE BULLETIN 64.17(2019):1215-1221.