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Phys. Rev. Lett. 68, 3088–3091 (1992)

[Issue 20 – 18 May 1992 ]

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Single-electron capacitance spectroscopy of discrete quantum levels

R. C. Ashoori, H. L. Stormer, J. S. Weiner, L. N. Pfeiffer, S. J. Pearton, K. W. Baldwin, and K. W. West
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
Received 2 March 1992

We observe the capacitance signal resulting from single electrons tunneling into discrete quantum levels. The electrons tunnel between a metallic layer and confined states of a single disk in a microscopic capacitor fabricated in GaAs. Charge transfer occurs only for bias voltages at which a quantum level resonates with the Fermi energy of the metallic layer. This creates a sequence of distinct capacitance peaks whose bias positions directly reflect the electronic spectrum of the confined structure. From the magnetic field evolution of the spectrum, we deduce the nature of the bound states.

©1992 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v68/p3088
DOI: 10.1103/PhysRevLett.68.3088
PACS: 73.20.Dx, 71.50.+t, 71.55.-i, 72.20.My

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