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<p>We use micro-angle-resolved photoemission spectroscopy (micro-ARPES) to investigate chiral charge density waves (CDWs) in 4Hb-TaS<sub>2</sub> with micron-scale spatial resolution. In the 1T layers of 4Hb-TaS<sub>2</sub>, we uncover coexisting left- and right-handed CDW domains and resolve four distinct spectral patterns arising from the interplay of chirality and rotational stacking. In contrast, bulk 1T-TaS<sub>2</sub> exhibits uniform chirality. In addition, 4Hb-TaS<sub>2</sub> shows negligible out-of-plane dispersion of the 1T-derived bands, in contrast to the large interlayer coupling observed in bulk 1T-TaS<sub>2</sub>. Density Functional Theory (DFT) calculations corroborate this picture, revealing that the interlayer interaction of the chiral order in 4Hb-TaS<sub>2</sub> is nearly two orders of magnitude weaker than in the 1T polytype. Our findings establish 4Hb-TaS<sub>2</sub> as a quasi-two-dimensional platform for exploring tunable chiral CDW phenomena.</p>

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Chiral charge density wave in 1T- and 4Hb-TaS2: the role of interlayer coupling

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月5日

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  • Roni Anna Gofman,
  • Abigail Dishi,
  • Hyeonhu Bae,
  • Yuval Nitzav,
  • Ilay Mangel,
  • Nitzan Ragoler,
  • Sajilesh K P,
  • Alex Louat,
  • Matthew D. Watson,
  • Cephise Cacho,
  • Dmitry Marchenko,
  • Andrei Varykhalov,
  • Irena Feldman,
  • Binghai Yan,
  • Amit Kanigel

摘要

We use micro-angle-resolved photoemission spectroscopy (micro-ARPES) to investigate chiral charge density waves (CDWs) in 4Hb-TaS2 with micron-scale spatial resolution. In the 1T layers of 4Hb-TaS2, we uncover coexisting left- and right-handed CDW domains and resolve four distinct spectral patterns arising from the interplay of chirality and rotational stacking. In contrast, bulk 1T-TaS2 exhibits uniform chirality. In addition, 4Hb-TaS2 shows negligible out-of-plane dispersion of the 1T-derived bands, in contrast to the large interlayer coupling observed in bulk 1T-TaS2. Density Functional Theory (DFT) calculations corroborate this picture, revealing that the interlayer interaction of the chiral order in 4Hb-TaS2 is nearly two orders of magnitude weaker than in the 1T polytype. Our findings establish 4Hb-TaS2 as a quasi-two-dimensional platform for exploring tunable chiral CDW phenomena.