Quasi-One-Dimensional Ta<sub>2</sub>PdSe<sub>6</sub> with Strong Topological Surface States for High-Performance and Polarization-Sensitive Terahertz Detection.
basic_science · Level V
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- Record sourced from PubMed, PMID 40193147.
- Also identified by DOI 10.1021/acs.nanolett.5c00328.
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Abstract
Topological surface states (TSS) in certain low-dimensional materials impart gapless band structure, massless quasiparticles, and nonlinear optical behavior, enabling distinct advantages for applications in low-energy photon detection. Herein, we develop a quasi-one-dimensional (quasi-1D) transition metal chalcogenide material, Ta<sub>2</sub>PdSe<sub>6</sub>, with robust TSS, which exhibits a gapless band structure protected by spin-momentum locking and time-reversal symmetry, alongside exceptional transport properties, including a high carrier mobility exceeding 10<sup>4</sup> cm<sup>2</sup>·V<sup>-1</sup>·s<sup>-1</sup>. The quasi-1D chain-like structure induces pronounced anisotropy and significantly reduces carrier scattering, further enhancing transport efficiency. Benefiting from these unique characteristics, the Ta<sub>2</sub>PdSe<sub>6</sub>-based terahertz (THz) detectors demonstrate outstanding performance with responsivity exceeding 3.63 A·W<sup>-1</sup>, a noise equivalent power of 7.4 pW·Hz<sup>-1/2</sup> at 0.28 THz, ultrafast response speed of 1.15 μs, and an exceptional photocurrent anisotropic ratio of 68.3. These findings highlight the significant potential of strong TSS in emerging materials to achieve high-performance and multifunctional THz detection.