Effects of electron–hole correlation in quantum dots under high magnetic field (up to 45 T)

✍ Scribed by R Cingolani; M.De Giorgi; R Rinaldi; H Lipsanen; M Sopanen; R Virkkala; K Maijala; J Tulkki; J Ahopelto; K Uchida; N Miura; Y Arakawa

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 108 KB
• Volume: 7
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(99)00338-0

✦ Synopsis

The in uence of the direct and exchange Coulomb interaction on Landau level formation in strain-induced quantum dots (QD) has been studied by high-ÿeld (45 T) magneto-luminescence and by many-electron-many-hole Hartree-Fock calculations. The Darwin-Fock states of the dots are found to merge into a single Landau level at very high ÿelds with a considerable reduction in the total diamagnetic shift due to the enhanced electron-hole correlation caused by the increased degeneracy of the state. We calculate a 50% reduction of the diamagnetic shift as a result of direct and exchange Coulomb interaction in the squeezed carrier states, in excellent agreement with the experimental ÿndings.