Instead of rendering a 3D lattice of quantum dots with falling photon spheres, this view plots the energy bookkeeping itself. The same simplified Brus effective-mass model sets the confinement bandgap:
E_g(R) = E_g,bulk + ħ²π²/(2R²)·(1/mₑ* + 1/m_h*)
− 1.8e²/(4πε₀ε_r R)
using the same PbSe-like parameters as the 3D model (E_g,bulk = 0.28 eV, mₑ*≈m_h*≈0.034m₀, ε_r≈23).
Top strip — energy cascade timeline: each incoming photon is drawn as a vertical bar whose height is its energy hν on a shared eV axis. Dashed horizontal lines mark Eg and every subsequent MEG threshold Eg + k·ξ·Eg; the bar is colour-banded by how many Eg-or-threshold rungs its own energy clears, i.e. exactly the same rule used by the 3D sim: N_ideal = min(⌊hν/E_g⌋, 1+⌊(hν−E_g)/(ξ·E_g)⌋), then each extra exciton beyond the first only survives with 65% probability (identical MEG efficiency assumption as the 3D model).
Bottom strip — R–hν phase diagram: a heatmap over quantum-dot radius (x-axis) and photon energy (y-axis) colours every point by the ideal exciton yield achievable there, with the live Eg(R) curve traced on top so you can see directly why absorption switches off below the curve (sub-gap photons) and where MEG turns on above it. A crosshair marks your current sliders — drag inside this panel to set R and hν directly.
Real-world relevance: PbSe and PbS quantum-dot solar cells are the leading experimental platform for MEG, because carrier multiplication can in principle push the single-junction efficiency limit above the ~33% Shockley–Queisser ceiling by harvesting UV/blue photons as more than one electron each.