Chiral charge order in the superconductor 2H-TaS2

Abstract

We find chiral charge order in the superconductor 2H-TaS2 using Scanning Tunneling Microscopy and Spectroscopy (STM/S) at 0.1 K. Topographic images show hexagonal atomic lattice and charge density wave (CDW) with clockwise and counterclockwise charge modulations. Tunneling spectroscopy reveals the superconducting density of states, disappearing at Tc = 1.75 K and showing a wide distribution of values of the superconducting gap, centered around Δ=0.28 meV.

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• The chiral phase transition in charge ordered 1T-TiSe2
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• Nontrivial Metallic State of Molybdenum Disulfide
• Band structure, superconductivity and polytypism in AuSn${}_4$
• Quasi-two-dimensional anisotropic superconductivity in Li intercalated 2H-TaS${}_2$
• Elemental chalcogens as a minimal model for chiral charge and orbital order
• Possible unconventional pairing in $(\text{Ca,Sr}{)}_3(\text{Ir,Rh}{)}_4{\text{Sn}}_{13}$ superconductors revealed by controlling disorder
• Topological Ising pairing states in monolayer and trilayer TaS${}_2$
• A revisit of superconductivity in 4$H_b$-TaS${}_{2-2x}$Se${}_{2x}$ single crystals
• Comment on "Charge-parity symmetry observed through Friedel oscillations in chiral charge-density waves" by J. Ishioka et al
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• Interlayer charge transfer induced by electronic instabilities in the natural van der Waals hetrostructure 4H${}_b$-TaS${}_2$
• Spin-Valley Locking in 2H-TaS2 and Its Co-Intercalated Counterpart: Roles of Surface Domains and Co Intercalation