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VOLUME 85, NUMBER 11 P H Y S I C A L R E V I E W L E T T E R S 11 SEPTEMBER 2000 Localization in Artificial Disorder: Two Coupled Quantum Dots
 

Summary: VOLUME 85, NUMBER 11 P H Y S I C A L R E V I E W L E T T E R S 11 SEPTEMBER 2000
Localization in Artificial Disorder: Two Coupled Quantum Dots
M. Brodsky,* N. B. Zhitenev,
and R. C. Ashoori
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
L. N. Pfeiffer and K. W. West
Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974
(Received 14 January 2000)
Using single electron capacitance spectroscopy, we study electron additions in quantum dots containing
two potential minima separated by a shallow barrier. Analysis of the addition spectra in the magnetic
field allows us to distinguish between electrons delocalized over the entire dot and those localized in
either of the potential minima. We demonstrate that a high magnetic field abruptly splits up a low-density
droplet into two smaller fragments, each residing in a potential minimum. An unexplained cancellation
of electron repulsion between electrons in these fragments gives rise to paired electron additions.
PACS numbers: 73.20.Dx, 73.20.Jc, 73.23.Hk
For half a century physicists have worked to understand
localization of strongly interacting electrons in a disor-
der potential. Either electron interactions or disorder can
produce localization [1,2]. Though their interplay in two-
dimensional systems has been a subject of intense ex-

  

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

 

Collections: Physics