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Science 5 December 1997:
Vol. 278. no. 5344, pp. 1784 - 1788
DOI: 10.1126/science.278.5344.1784
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Reports

Correlations Between Ground and Excited State Spectra of a Quantum Dot

D. R. Stewart, D. Sprinzak, C. M. Marcus, * C. I. Duruöz, J. S. Harris Jr.

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 the N-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.

D. R. Stewart, Department of Applied Physics, Stanford University, Stanford, CA 94305, USA.
D. Sprinzak, Department of Physics, Stanford University, Stanford, CA 94305, USA, and Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
C. M. Marcus, Department of Physics, Stanford University, Stanford, CA 94305, USA.
C. I. Duruöz and J. S. Harris Jr., Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA.
*   To whom correspondence should be addressed.

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