Figure 3: Observation of out-of-plane dispersion in Cd3As2.
From: Observation of a three-dimensional topological Dirac semimetal phase in high-mobility Cd3As2
(a) Angle-resolved photoemission spectroscopy (ARPES) dispersion maps at various incident photon energies are shown in the first and third rows. First-principle calculated in-plane electronic dispersion at different kz values near the three-dimensional (3D) Dirac node k0 is plotted in the second and forth rows. (b) ARPES measured out-of-plane linear E−kz dispersion. (c) ARPES measured in-plane E−kx dispersion. The white dotted lines are guides to the eye tracking the out-of-plane dispersion. (d) Theoretically calculated out-of-plane E−kz dispersion near the 3D Dirac node shown over a wider energy window. (e) Schematic (cartoon) of the 3D (anisotropic) Dirac semimetal band structure in Cd3As2. (f) Spin-integrated ARPES dispersion cut measured on the sample used for spin-resolved measurements. The dotted lines indicate the momentum locations for the spin-resolved energy-dispersive curve cuts. (g and h) Spin-resolved ARPES intensity (black and red circles) and measured net spin polarization (blue dots) for cuts 1 and 2. Error bars represent the experimental uncertainties (standard deviation) in determining the spin polarization.
