Two-dimensional Ising superconductivity and charge density wave in three-dimensional bulk 4Hb-TaS2

ORAL

Abstract

The dimensionality of matter significantly influences its quantum properties. In two-dimensional (2D) superconducting transition-metal-dichalcogenides (TMDs) with 1H structure, the in-plane critical magnetic field (Hc2) is substantially larger than the Pauli limit due to the strong Ising spin-orbital coupling. This phenomenon, known as Ising superconductivity, disappears in three-dimension (3D) as the global inversion symmetry restores in the 2H structure. Similarly, a quantum spin liquid state can emerge in the 2D 1T-TaS2 monolayers but vanishes in the 3D counterpart due to interlayer coupling. Using elastic and meV-resolution inelastic X-ray scattering and quantum transport, we show that the 2D Ising superconductivity and CDW emerge in the 3D bulk materials 4Hb-TaS2. The 2D nature of star-of-David CDW phase in 1T layer, combined with the 2D Ising superconductivity in 1H layer, provides a foundation for the potential realization of the Z2 quantum spin liquid state in 4Hb-TaS2. Our findings establish 4Hb-TaS2 as a promising platform for the exploration of exotic 2D quantum phenomena in 3D quantum heterostructures.

* This research was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. This research used resources beamline 4ID of the Advanced Photon Source, a U.S. DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. ARPES and IXS measurements used resources at 10-ID and 21-ID-1 beamlines of the National Synchrotron Light Source II, a US Department of Energy Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under contract no. DE-SC0012704.

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Publication: Fazhi Yang, Heda Zhang, Hechang Lei, Hu Miao, et al. Two-dimensional Ising superconductivity and charge density wave in three-dimensional bulk 4Hb-TaS2, in preparation.

Presenters

  • Fazhi Yang

    Oak Ridge National Laboratory

Authors

  • Fazhi Yang

    Oak Ridge National Laboratory

  • Heda Zhang

    Oak Ridge National Lab

  • Hechang Lei

    Renmin University of China, Renming University of China, Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China

  • Hu Miao

    ORNL