Extended Data Fig. 8: Hybridized orbital states under an elliptical confinement with dr′ = 0.19.
From: Orbital hybridization in graphene-based artificial atoms
a. Left panel: A STM image (Vb = 500 mV, I = 100 pA) of the elliptical QD with anisotropy degree \({{dr}}^{{\prime} }=\,0.19\) embedded in the graphene/WSe2 heterostructure. The minor radius r1 is approximately 7.6 nm, and the major radius r2 is approximately 11.2 nm. The height profile along the red dashed line is shown with solid red line. Top right panels: Atomic-resolved STM image on (1 T’ phase) and off (2H phase) the QD, respectively. Bottom right panels: The FFT image obtained from the STM image on and off the QD, respectively. The white and green circles show reciprocal lattices of graphene and WSe2, respectively. The unlabeled bright spots correspond to the reciprocal moiré superlattices and higher-order scattering. b. The dI/dV spectroscopic map versus the spatial position along the major axis of the elliptical QD. Orbital states can be clearly observed in the QD. The two yellow dashed lines mark the size of the QD. c. dI/dV maps of different orbital states. For an elliptical confinement, the anisotropy of confining potential results in orbital hybridization between the s-orbital and d-orbital states, giving rise to new states sd+ \({\psi }_{(\mathrm{0,2})}+\alpha {\psi }_{(\mathrm{2,1})}\) and sd- \(-\alpha {\psi }_{(\mathrm{0,2})}+{\psi }_{(\mathrm{2,1})}\), which exhibit θ-shaped and rotated θ-shaped features marked by the green dotted lines, respectively. The yellow dashed lines show outlines of the elliptical QD.
