Momentum-dependent charge-density-wave gap formation in ZrTe_2.98Se_0.02

2026/04/14 by Iori Ishiguro, Hayate Kunitsu, Natsuki Mitsuishi +5 · 1 voice
Physics and Astronomy · #cond-mat.other

paper · pdf

Abstract

We investigated the energy gap formation across the charge density wave (CDW) transition inof ZrTe_2.98Se_0.02. By employing a laser photoemission microscopy, we clearly resolved one elliptical Fermi surface (FS) around the Brillouin zone (BZ) center, and two quasi-one-dimensional FSs along the BZ boundary. We further mapped the intensity difference between the FSs below and above the CDW transition temperature. We found that the energy CDW gap formation is limited to the momentum region 0.25 Å^-1 < ky < 0.8 Å^-1 along B-D line, which coincides with the location of one of the quasi-one-dimensional FSs. Characteristic momentum dependence in the energy CDW gap suggests the importance of both FS nesting and band-dependent electron-phonon coupling for understanding the CDW state in ZrTe₃ system.

Discussions

• Ishiguro, Kunitsu, Mitsuishi, Tsuda, Yaji, Yamakawa, Kontani, Shimojima: Momentum-dependent charge-density-wave gap formation in ZrTe_{2.98}Se_{0.02} https://arxiv.org/abs/2604.12326 https://arxiv.org [bsky, 0 points, 0 comments]

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