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.
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