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Correlations Between Ground and Excited State Spectra of a Quantum Dot

Science  05 Dec 1997:
Vol. 278, Issue 5344, pp. 1784-1788
DOI: 10.1126/science.278.5344.1784

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Abstract

The ground and excited state spectra of a semiconductor quantum dot with successive electron occupancy were studied with linear and nonlinear magnetoconductance measurements. A direct correlation was observed between the mth excited state of theN-electron system and the ground state of the (N+ m)-electron system for m up to 4. The results are consistent with a single-particle picture in which a fixed spectrum of energy levels is successively filled, except for a notable absence of spin degeneracy. Further departures from the single-particle picture due to electron-electron interaction were also observed. Magnetoconductance fluctuations of ground states show anticrossings where wave function characteristics are exchanged between adjacent levels.

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