Year: 2025
Type: article
Abstract: Intrinsic topological superconductors have garnered significant attention for their potential to harbor novel quantum phenomena. However, the limited availability of suitable material systems has hindered progress in this field. Here, we present the synthesis and characterization of high-quality self-assembled SnS/TaS2 (SnTaS3) superlattice, which exhibits superconductivity alongside non-trivial band topology. Temperature-dependent magnetization susceptibility and electrical transport results confirm SnTaS3 as a type-II superconductor with a critical transition temperature Tc of 3 K. Interestingly, this superconductivity can be turned off via an innovative solid proton gate technique, and a new superconducting state with a Tc of ~2.3 K emerges when the gating voltage reaches -9.47 V. Heat capacity measurements reveal strong electronic correlations within this material, which is further supported by angle-resolved photoemission spectroscopy and first-principles calculations, underscoring the effect of topological flat bands and Van Hove singularity. Our research introduces a promising self-assembled material platform, adeptly positioned to delve into the quest for topological superconductors.
Source: Nano Research
Authors: Junjie Wu, Xiaoming Zhang, Tongrui Li, Chunsheng Wang, Changlong Wang, Yan Feng, Xiang Ma, Zhe Sun, Yalin Lu, Guolin Zheng, Feng Liu, Bin Xiang
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $5,290
OpenAlex ID: W4413064186