Table 1. LDA and G0W0 Lowest Indirect and Direct QP Band Gap and Hole Effective Masses of Cubic Cs2AgBiBr6 at X (in Units of the Electron Rest Mass m0)a.
QP band
gap (eV) |
hole
effective mass (m0) |
|||||
---|---|---|---|---|---|---|
X → L | X → X | mh1 | mh2 | mh3 | mh* | |
DFT-LDA | 0.90 | 1.67 | 0.79 | 0.73 | 0.17 | 0.36 |
G0W0@LDA | 1.66 | 2.41 | 0.72 | 0.67 | 0.15 | 0.31 |
The indices correspond to principal axes of the effective mass tensor. mh3 corresponds to the hole effective mass along the direction from X to Γ. mh* is computed as the harmonic mean of the masses along the three principal components.