Supporting Information
Liu et al. 10.1073/pnas.1602473113
Fig. S1.
E
−
b
for alkali metals binding to various substrates.
Fig. S2.
E
−
b
for alkaline earth metals binding to various substrates.
Liu et al.
www.pnas.org/cgi/content/short/1602473113
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Fig. S3.
Band structures of Mg (
Left
) and Ca (
Right
) adsorbed on graphene. The systems consist of one metal and 6
×
6 unit cells of graphene. The spins for Ca
adsorption are polarized, and hence are shown in different colors. Fermi levels are set to zero. Note that, for Mg adsorption on graphene, Fermi level r
etains at
Diract point, indicating no charge transfer occurs.
Liu et al.
www.pnas.org/cgi/content/short/1602473113
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