Figure 2 | Scientific Reports

Figure 2

From: Electronic structure of vertically coupled quantum dot-ring heterostructures under applied electromagnetic probes. A finite-element approach

Figure 2

Schematic representation of the GaAs quantum ring and quantum dot system embedded in a matrix of Al\(_{0.28}\)Ga\(_{0.72}\)As. The half of the \(y=0\) projection is depicted in panel (a), where \(R_1\) and \(R_2\) represent the ring and dot radii, respectively. The points \((x_R,z_R)\) and \((x_D,z_D)\) correspond to the coordinates of the ring and dot projections, respectively. The parameters \(R=70\) nm and \(L=100\) nm represent the size of the rectangle in which upper, lower, and right-hand sides Dirichlet conditions are imposed. F and B are the vertically applied electric and magnetic field, respectively. (b) 3D view of the system, after rotating the figure (a) around z-axis. (c) ring and dot projections when in touch. The position of the ring with respect to the dot is defined via the \(\theta\)-angle. Reference frame is localized at the left-bottom corner of the rectangle.

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