Gate Performance in Resonant Tunneling Single Electron Transistor

Takashi HONDA  Seigo TARUCHA  David Guy AUSTING  

IEICE TRANSACTIONS on Electronics   Vol.E81-C   No.1   pp.2-7
Publication Date: 1998/01/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Technology Challenges for Single Electron Devices)
single electron tunneling,  Coulomb oscillation,  transistor,  Coulomb blockade,  resonant tunneling,  

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Gate performance for observing Coulomb oscillations and Coulomb diamonds are compared for two types of gated sub-µm double-barrier heterostructures. The first type of device contains modulation-doped barriers, whereas the second type of device contains a narrower band gap material for the well and no barriers with doped impurities. Both the Coulomb oscillations and Coulomb diamonds are modified irregularly as a function of gate voltage in the first type of device, while in the second type of device they are only systematically modified, reflecting atom-like properties of a quantum dot. This difference is explained in terms of the existence of impurities in the first type of device, which inhomogeneously deform the rotational symmetry of the lateral confining potential as the gate voltage is varied. The absence of impurities is the reason why we observe the atom-like properties only in the second type of device.