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VOLUME 79, NUMBER 12 P H Y S I C A L R E V I E W L E T T E R S 22 SEPTEMBER 1997 Periodic and Aperiodic Bunching in the Addition Spectra of Quantum Dots
 

Summary: VOLUME 79, NUMBER 12 P H Y S I C A L R E V I E W L E T T E R S 22 SEPTEMBER 1997
Periodic and Aperiodic Bunching in the Addition Spectra of Quantum Dots
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 27 March 1997)
We study electron addition spectra of quantum dots in a broad range of electron occupancies
starting from the first electron. Spectra for dots containing ,200 electrons reveal a surprising feature.
Electron additions are not evenly spaced in gate voltage. Rather, they group into bunches. With an
increasing number of electrons the bunching evolves from occurring randomly to periodically at about
every 5th electron. The periodicity of the bunching and features in electron tunneling rates suggest
that the bunching is associated with electron additions into spatially distinct regions within the dots.
[S0031-9007(97)04028-3]
PACS numbers: 73.20.Dx, 71.30.+h, 73.20.Jc, 73.40.Gk
Coulomb blockade (CB) is one of the most fundamental
and robust concepts in mesoscopic physics. Lambe and
Jaklevic first made this point clear in a seminal experiment
nearly 30 years ago [1]. For a metallic island poorly
coupled to its surroundings, the number of electrons is

  

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

 

Collections: Physics