2007/12/21 by B. Szafran, E. Barczyk, F. M. Peeters +1 · 22 citations
Engineering · Physics and Astronomy · #Atomic physics #Condensed matter physics #Coupling (piping) #Electric field #Electron #Exciton #Field (mathematics) #Materials science #Molecular Junctions and Nanostructures #Physics #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Quantum tunnelling #Quantum-confined Stark effect #Semiconductor Quantum Structures and Devices #Stack (abstract data type) #Stark effect #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.77.115441
published in Physical Review B 77(11) (American Physical Society) · submitted to PRB
arxiv created 2007/12/21 · openalex publication_date 2008/03/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study an electron-hole pair in a stack of multiple quantum dots in the presence of an external electric field using the configuration-interaction approach. We find that the bright energy levels can be grouped into families which are associated with the hole localized in a specific dot of the stack. The exciton energy levels undergo avoided crossings as function of the external electric field with different patterns for each family. We show that the variation of the depths of the dots along the stack can be deduced from the exciton spectrum. For stronger coupling the families are mixed by a weak electric field due to hole tunneling. This results in a characteristic multiple avoided crossing of energy levels belonging to different families with an accompanying modulation of the recombination probabilities and an appearance of a single particularly bright state. Discussion of a simple modeling of these avoided crossings is provided.