Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session P13: Topological Insulator based Topological Superconductivity
2:30 PM–5:30 PM,
Wednesday, March 7, 2018
LACC Room: 304A
Sponsoring Unit: DMP
Chair: Yi Li, Johns Hopkins University
Abstract: P13.00008 : Nanoscale Imaging of a Topological Insulator Grown on a Cuprate Superconductor using Molecular Beam Epitaxy*
4:18 PM–4:30 PM
(University of Virginia)
(Brookhaven National Laboratory)
When an s-wave superconductor (SC) is interfaced with a topological insulator (TI), the TI can become superconducting by proximity. The emergent phase of matter is predicted to host Majorana zero modes (Fu and Kane, PRL 100, 096407 (2008)), and has promising applications in quantum computation. In contrast to a well-understood theoretical framework of s-wave SC/TI heterostructures, it is unclear if Majorana zero modes are expected to appear in a d-wave SC/TI heterostructure. Moreover, the experiments so far have reported conflicting observations of proximity-induced superconductivity in these systems (Wang et al., Nature Physics 9, 621 (2013), Yilmaz et al., PRL 113, 077003 (2014)). To shed light on this, we perform scanning tunneling microscopy/spectroscopy experiments of a prototypical topological insulator Bi2Te3 grown on a cuprate high-Tc superconductor Bi2Sr2CaCu2O8+x using molecular beam epitaxy. We characterize the electronic band structure of the topmost TI surface using quasiparticle interference imaging, and discuss the implications of our measurements on previous observations of proximity-induced superconductivity in this system.
*We gratefully acknowledge the support from the Army Research Office Grant No. W911NF-17-1-0399 and the NSF Grant No. 1654041.
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