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Trion X+ in vertically coupled type II quantum dots in threading magnetic field
Sindi Horta-Piñeres1, Gene Elizabeth Escorcia-Salas, Ilia D Mikhailov
1Group of Investigation in Condensed Matter Theory, Universidad del Magdalena, Santa Marta, AA 731, Colombia. jsierraortega@gmail.com.
Nanoscale Research Letters
|September 28, 2012
Summary
We analyzed the energy spectrum of excitons in coupled quantum dots. The study details how quantum dot properties and magnetic fields affect exciton states.
Area of Science:
- Condensed Matter Physics
- Quantum Dot Physics
Background:
- Semiconductor heterostructures with quantum dots are crucial for optoelectronic devices.
- Understanding exciton behavior in these structures is key to device performance.
Purpose of the Study:
- To analyze the energy spectrum of a positively charged exciton (trion) in a vertically coupled type II quantum dot system.
- To investigate the influence of quantum dot morphology, dimensions, separation, wetting layer thickness, and magnetic field on trion states.
Main Methods:
- Solving the Schrödinger equation using variational separation of variables in the adiabatic limit.
- Numerical analysis of bonding and anti-bonding lowest-lying trion states.
Main Results:
- The electron is primarily confined within the quantum dots, while holes reside in the exterior region.
- Detailed numerical results illustrate the dependence of trion energy states on various structural and external parameters.
Conclusions:
- The study provides insights into the tunable energy spectrum of trions in coupled quantum dots.
- Findings are relevant for designing and optimizing semiconductor nanostructures for specific electronic and optical applications.
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