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Single-electron charging of quantum-dot atoms
Abstract
Arrays of field-effect-confined quantum dots with diameters smaller than 100 nm have been prepared starting from ${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As-GaAs heterostructures. In far-infrared spectroscopy, we induce transitions between the 2-meV-separated quantum levels. We observe discrete steps in the gate-voltage dependence of the integrated absorption strength indicating directly the incremental occupation of each dot with N=1, 2, 3, and 4 electrons. From the gate-voltage dependence, we can estimate a Coulomb charging energy of about 15 meV. On a very fine scale, we also observe a spectral fine structure for the excitation of the quantum-dot atoms.
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Citations
Cited by
Lent, C. S., Tougaw, P. D., Porod, W., & Bernstein, G. H. (1993) · Nanotechnology · doi:10.1088/0957-4484/4/1/004 · Cited by 1,793
Electronic structure of quantum dots
Reimann, S. M., & Manninen, M. (2002) · Reviews of Modern Physics · doi:10.1103/revmodphys.74.1283 · Cited by 1,380
A device architecture for computing with quantum dots
Lent, C. S., & Tougaw, P. D. (1997) · Proceedings of the IEEE · doi:10.1109/5.573740 · Cited by 1,273
Bistable saturation in coupled quantum dots for quantum cellular automata
Lent, C. S., Tougaw, P. D., & Porod, W. (1993) · Applied Physics Letters · doi:10.1063/1.108848 · Cited by 379
Metadata
- Authors
- Meurer, B., Heitmann, D., & Ploog, K.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 1992-03-02
- Volume
- 68
- Issue
- 9
- Pages
- 1371-1374
- ISSN
- 0031-9007 (ISSN-L)
- OpenAlex
- W2065832212
- Cited by
- 291
- References
- 0
- FWCI
- 19.56
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Single-electron charging of quantum-dot atoms. https://app.cochat.ai/papers/10.1103/physrevlett.68.1371
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- Meurer, B., Heitmann, D., & Ploog, K. (1992). Single-electron charging of quantum-dot atoms. Physical Review Letters. https://doi.org/10.1103/physrevlett.68.1371
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