Superconductivity in Potassium-intercalated Td-WTe2

Abstract

To realize topological superconductor is one of the most attracting topics because of its great potential in quantum computation. In this study, we successfully intercalate potassium (K) into the van der Waals gap of type II Weyl semimetal WTe2, and discover the superconducting state in KxWTe2 through both electrical transport and scanning tunneling spectroscopy measurements. The superconductivity exhibits an evident anisotropic behavior. Moreover, we also uncover the coexistence of superconductivity and the positive magneto-resistance state. Structural analysis substantiates the negligible lattice expansion induced by the intercalation, therefore suggesting K-intercalated WTe2 still hosts the topological nontrivial state. These results indicate that the K-intercalated WTe2 may be a promising candidate to explore the topological superconductor.

17 pages, 4 figures

References in corpus (15)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Quantum Spin Hall Effect and Topological Field Effect Transistor in Two-Dimensional Transition Metal Dichalcogenides
• Titanic Magnetoresistance in WTe2
• Gate-tunable Phase Transitions in 1T-TaS${}_2$
• LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
• Superconductivity at 32 K in single crystal Rb${}_{0.78}$Fe${}_2$Se${}_{1.78}$}
• Superconducting Phases in Potassium-Intercalated Iron Selenides
• Electrostatically Induced Superconductivity at the Surface of WS${}_2$
• Experimental observation of anisotropic Adler-Bell-Jackiw anomaly in type-II Weyl semimetal WTe${}_{1.98}$ crystals at the quasi-classical regime
• Electrochemical synthesis and superconducting phase diagram of Cu_xBi2Se3
• High Current Density and Low Thermal Conductivity of Atomically Thin Semimetallic WTe2
• Superconductivity and Magnetic Properties of high-quality single crystals of $A_x$Fe${}_2$Se${}_2$ ($A$ = K and Cs)
• Shubnikov-de Haas oscillations, weak antilocalization effect and large linear magnetoresistance in the putative topological superconductor LuPdBi
• Superconductivity at Tc = 44 K in LixFe2Se2(NH3)y
• Atomic-scale visualization of quasiparticle interference on a type-II Weyl semimetal surface

Cited by in corpus (2)

• Direct evidence for charge compensation induced large magnetoresistance in thin WTe2
• Turning ZrTe5 into semiconductor through atomic intercalation