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The Physics of NanoelectronicsTransport and Fluctuation Phenomena at Low Temperatures$
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Tero T. Heikkilä

Print publication date: 2013

Print ISBN-13: 9780199592449

Published to Oxford Scholarship Online: December 2013

DOI: 10.1093/acprof:oso/9780199592449.001.0001

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Quantum dots

Quantum dots

Chapter:
(p.140) 8 Quantum dots
Source:
The Physics of Nanoelectronics
Author(s):

Tero T. Heikkilä

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199592449.003.0008

Quantum dots are small islands connected to typically metallic electrodes. Their small size shows up in the large spacing of the single-electron energy levels inside these islands. This chapter explains the main transport phenomena taking place in quantum dots, and different theoretical approaches constructed to describe them. The approaches include the self-consistent mean field theory relevant in the weakly interacting limit and the theory of Coulomb blockade in the strongly interacting limit. Between these limits one can find the Kondo effect, which is phenomenologically explained in the chapter. The discussion also covers the properties of double quantum dots, and some of their properties, such as the spin states, Pauli spin blockade, and usage as quantum bits.

Keywords:   quantum dot, mean field model, Coulomb blockade, Kondo effect, double quantum dot, spin qubit

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