Real-Space Mapping of Exciton Wave Functions in a Quantum Dot with Near-Field Optical Imaging Spectroscopy

T. Saiki, K. Matsuda, S. Nomura, M. Mihara, Y. Aoyagi, S. Nair, T. Takagahara

Research output: Contribution to journalConference articlepeer-review


An exciton confined within a quantum dot acts as a two-level quantum system, and is one of the most promising candidates for quantum computing and quantum information processing. The real-space optical probing of the quantum eigenstates in a single quantum dot and coupled quantum dots should be developed toward the realization of quantum photonic devices, where their wave functions are dynamically controlled by coherent optical techniques. Here we apply near-field photoluminescence imaging spectroscopy with a high spatial resolution of 30 nm to map out the centre-of-mass wave function of an exciton confined in a GaAs quantum dot. The spatial profile of the exciton emission, which reflects the shape of a monolayer-high island, differs from that of biexciton emission, due to different distributions of the polarization field for the exciton and biexciton recombinations.

Original languageEnglish
Pages (from-to)281-287
Number of pages7
JournalActa Physica Polonica A
Issue number3-4
Publication statusPublished - 2003
EventProceedings of the 3rd International Symposium Scanning Probe Spectroscopy and Related Methods - Poznan, Poland
Duration: 2003 Jul 162003 Jul 19

ASJC Scopus subject areas

  • General Physics and Astronomy


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