Redshift of the excited state due to a nondegenerate biexciton in self-organized quantum dots

K. Kim, T. B. Norris, U. Hohenester

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3 Citations (Scopus)

Abstract

Using femtosecond differential transmission spectroscopy, we observed a "nondegenerate" biexciton, consisting of an electron-hole pair in the dot ground state and an electron-hole pair in the excited state, in InGaAs self-organized quantum dots. We resonantly pumped the ground state transition in the quantum dots and observed an induced resonance in the probe differential transmission spectrum near the first excited-state transition, which we attribute to the formation of a nondegenerate biexciton state. The binding energy of 15 meV does not change with excitation power, thus reflecting a genuine feature of few-particle states. Our theoretical model calculations show good agreement with these experimental results. When a prepulse is used to generate a population inversion in the quantum dots, we also observed the effects of nondegenerate biexcitonic correlations in differential transmission.

Original languageEnglish
Article number113702
JournalJournal of Applied Physics
Volume103
Issue number11
DOIs
Publication statusPublished - 2008

Bibliographical note

Funding Information:
We thank Professor Bhattacharya for the supply of QD samples. This study was supported by a grant from the National R & D Program for Cancer Control, Ministry of Health & Welfare, Republic of Korea (0720170), by the Bio R & D program through the Korea Science and Engineering Foundation funded by the Ministry of Science & Technology (KOSEF 2007-8-1158), and by a Korea Research Foundation Grant provided by the Korean Government (MOEHRD, Basic Research Promotion Fund) (KRF-2007-331-C00121).

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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