期刊
PHYSICAL REVIEW LETTERS
卷 104, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.246802
关键词
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资金
- MIUR-PRIN [2008H9ZAZR]
- INFM-CINECA [2009]
- NSF within the Nanoscale Science and Engineering Initiative [CHE-0641523]
- NSF [DMR-0803445]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0803691] Funding Source: National Science Foundation
We observe the low-lying excitations of a molecular dimer formed by two electrons in a GaAs semiconductor quantum dot in which the number of confined electrons is tuned by optical illumination. By employing inelastic light scattering we identify the intershell excitations in the one-electron regime and the distinct spin and charge modes in the interacting few-body configuration. In the case of two electrons, a comparison with configuration-interaction calculations allows us to link the observed excitations with the breathing mode of the molecular dimer and to determine the singlet-triplet energy splitting.
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