Electronic states and tunneling times in coupled self-assembled quantum dots

✍ Scribed by R López-Bolaños; G.H Cocoletzi; S.E Ulloa

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 100 KB
• Volume: 30
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.2002.1018

✦ Synopsis

Electron energy levels in single dots, and energy splitting and tunneling times in stacked quantum dots are calculated as functions of structure parameters. An effective mass approach is used to solve the Schrödinger equation for cylindrical dots with finite confinement potentials. Strong confinement due to small sizes produces quantized energy levels in single dots and strong interactions of the wavefunctions with adjacent dots. This electronic coupling induces significant energy splittings and short tunneling times for characteristic structures used in experiments. This coupling may even yield coherent artificial molecular states with different optical properties.