Fig. 1: Structure, Brillouin zone and the Fermi surface of LaTe3 in the CDW state.
a The 7-fold (1 × 1 × 7) modulated primitive unit cell of LaTe3 comprising of 56 atoms with wave vector qCDW = \(\frac{2}{7}\)c* viewed perpendicular (left) and parallel (right) to the c\({}^{{\prime} }\) direction. The lattice constants are \({a}^{{\prime} }\)= \({b}^{{\prime} }\)= 13.256 Å, \({c}^{{\prime} }\)= 30.778 Å with \({\alpha }^{{\prime} }\)= \({\beta }^{{\prime} }\)= 90∘, and \({\gamma }^{{\prime} }\)=160.99∘. The cleavage plane (light blue) occurs in between the two weakly interacting Te layers indicated by the blue double-sided arrows. b High resolution scanning tunneling microscopy topography image (4.2 nm × 4.2 nm) obtained with bias voltage of 0.2 V and a tunneling current of 0.4 nA. The overlaid orange circles represent the Te atom positions. The white dashed lines show the average positions of the adjacent Te chains. c Low energy electron diffraction pattern, measured with 77 eV primary beam energy, shows the reciprocal space in the kx-kz plane (black arrows). C, D, C\({}^{{\prime} }\), and D\({}^{{\prime} }\) represent the main spots; the CDW satellite spots are highlighted by blue circles. d The CDW Brillouin zone (BZ) (black) is shown within that of the non-CDW state (light blue). The high symmetry points83 are indicated in these respective colors. Γ, Y and X points coincide for both. The Σ lines represented by ΓX and Γ2X2 in the 2nd BZ are shown in green color. See Supplementary Fig. 6c for the other high symmetry points and directions in the CDW BZ. e The Fermi surface in the CDW state measured by ARPES, where the length of the black dashed arrows (#1, #2) that join the shadow branches with the main branches of the Fermi surface represents qCDW. The colorbar shows the intensity in arbitrary units (arb. units).
