---------------------------------------------------------------------------
This document explains items for each entry.
---------------------------------------------------------------------------
ads_id: source id of building block1
band:
    band_gap:
        direct: A boolean telling if the gap is direct or not
        energy: band gap energy
        transition: kpoint labels of the transition (e.g., “\Gamma-X”)
    cbm:
        band_index:  A dict with spin keys pointing to a list of the indices of the band containing the CBM (please note that you can have several bands sharing the CBM) {Spin.up:[], Spin.down:[]}
        energy: The energy of the CBM
    efermi: Fermi energy
    eigval_dw: eigenvalue for spin down channel. For each entry, the first one is kpoint distance, and the remaining ones are eigenvalues for each band (without substrating Fermi energy)
    eigval_up: eigenvalue for spin up channel. For each entry, the first one is kpoint distance, and the remaining ones are eigenvalues for each band (without substrating Fermi energy)
    eigval: eigenvalues for the material. For each entry, the first one is kpoint distance, and the remaining ones are eigenvalues for each band (without substrating Fermi energy)
    elements: elements of the crystal
    high_sym: position of high symmetry kpoints
    is_metal: A boolean telling if the material is metallic or not
    is_spin_polarized: A boolean telling if the material is spin polarized or not
    nelements: number of atoms for corresponding element
    ticks: ticks for high symmetry kpoints
    vbm:
        band_index:  A dict with spin keys pointing to a list of the indices of the band containing the VBM (please note that you can have several bands sharing the VBM) {Spin.up:[], Spin.down:[]}
        energy: The energy of the VBM
crys_sys: crystal system
e_above_hull: energy above hull
efermi: Fermi energy
elements: a dict contains elements of the crystal
etot: total energy
lattice: lattice parameters for a, b, c, alpha, beta, gamma
phonon:
    data:
        band: q points, frequencies
        dataset: file used by phonopy
        dos: partial and total phonon density of states
        force_sets: file used by phonopy
        labels: labels for high symmetry qpoints
        sc_matrix: supercell used in calculating phonon dispersion
        unitcell: file used by phonopy
    dim: dimension of supercell used in calculating phonon dispersion
    stability: evaluate the lattice-dynamical stability according to phonon dispersion
    structures: structures used in phonon calculation
point_group: point group
prototype: prototype
spg: space group
structure: structure with pymatgen module format
structure_id: unique id of the structure
sub_id: source id of building block2
vdw: A boolean telling if the structure is a van der Waals material or not


