Figure 2
From: Strong One-Dimensional Characteristics of Hole-Carriers in ReS2 and ReSe2
In-plane valence band dispersions near the valence band maximum. Constant energy (E-EVBM = − 0.2 eV) ARPES maps of ReS2 (a) and ReSe2 (c). The photon energy used for the experiment was 70 eV for ReS2 and 68 eV for ReSe2. For these photon energies, \({{\boldsymbol{k}}}_{{\boldsymbol{z}}}\) = Z point (white dot) where VBM is located is included in the data. Red solid and dashed lines in (a,c) indicate the direction parallel and perpendicular to the Re chain direction, respectively. θ is defined as the relative angle from the direction along the chain as shown in the figure. The honey comb structured line indicates the projected Brillouin zone boundary. (b,d) High symmetric cuts along (θ = 0°) and perpendicular (θ = 90°) to the Re chain. The dotted lines in (b,d) are quadratic fit to the top-most bands. The effective masses of hole carriers of ReX2 extracted from the fitting functions are shown in the figures.
