網址: https://www.researchgate.net/profile/James-Van-Yperen/publication/347388565/figure/fig4/AS:969473511157760@1608151905518/Different-types-of-potentials-The-red-line-depicts-the-double-well-the-blue-line.png
網址2: https://www.researchgate.net/figure/Different-types-of-potentials-The-red-line-depicts-the-double-well-the-blue-line_fig4_347388565
