Kavli Affiliate: Jing Wang
| First 5 Authors: Jing Wang, Xiaotai Wu, Wen-Sheng Zhao, Yuhua Cheng, Yue Hu
| Summary:
We study the atomic collapse phenomenon in $K$ and $K’$ valley of gapped
graphene. Bound states induced by Coulomb impurity in the gap turn into atomic
collapse resonances as the charge increases beyond the supercritical charge
$Z_c$. $Z_c$ increases sublinear with the band gap $Delta$. The atomic
collapse resonances result in peaks in the LDOS at the same energies in $K$ and
$K’$ valley, but the strong (weak) LDOS peaks in $K$ valley are weak (strong)
LDOS peaks in $K’$ valley reminiscent of pseudospin polarization phenomenon.
From a spatial LDOS analysis of the atomic collapse resonance states, we assign
specific atomic orbitals to the atomic collapse resonances. Remarkably, the two
$p$ atomic orbital atomic collapse states are no longer degenerate and splits
into two having lobes in different directions in the graphene plane.
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