Angle-Resolved Photoemission Measurement along the van-der-Waals Stacking Direction of ZrTe₃

The electronic structure of ZrTe₃ has been investigated by angle-resolved photoemission spectroscopy. We successfully obtained the spectra on the cleaved bc surface, which makes it possible to directly study the electronic dispersion along the van-der-Waals stacking direction. No noticeable dispersion was observed, which raises a question of how the Fermi surface nesting works on the charge-density-wave (CDW) formation with a finite nesting-vector component along the stacking direction. In ZrTe₃, despite the weak interlayer hybridization, the CDW order is established across the van-der-Waals spacing.