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Single-electron capacitance spectroscopy of vertical quantum dots using a single-electron transistor
 

Summary: Single-electron capacitance spectroscopy of vertical quantum dots
using a single-electron transistor
M. Koltonyuk, D. Berman,a)
N. B. Zhitenev,b)
and R. C. Ashooric)
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
L. N. Pfeiffer and K. W. West
Lucent Technologies Bell Laboratories, Murray Hill, New Jersey 07974
Received 5 June 1998; accepted for publication 18 November 1998
We have incorporated an aluminum single-electron transistor SET directly on top of a vertical
quantum dot, enabling the use of the SET as an electrometer that is extremely responsive to the
motion of charge into and out of the dot. Charge induced on the SET central island from
single-electron additions to the dot modulates the SET output, and we describe two methods for
demodulation that permit quantitative extraction of the quantum dot capacitance signal. The two
methods produce closely similar results for the determined single-electron capacitance peaks.
1999 American Institute of Physics. S0003-6951 99 01404-7
The single-electron transistor SET 13
is a highly
charge-sensitive device, capable of detecting charges far less
than that of one electron. This remarkable property allows a

  

Source: Ashoori, Raymond - Department of Physics, Massachusetts Institute of Technology (MIT)

 

Collections: Physics