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    STUDIA PHYSICA - Issue no. 1 / 2007  
         
  Article:   COHERENT TRANSPORT AND SPIN EFFECTS IN QUANTUM DOTS.

Authors:  BOGDAN R. BUŁKA.
 
       
         
  Abstract:  The lecture is a review of recent results on coherent electronic transport in quantum dots, especially on a role of the spin. In macroscopic metallic systems, an introduction of magnetic impurities leads to the Kondo effect, which is a spin-flip process of a localized spin at the impurity caused by resonant interactions with spins of conducting electrons [1]. In the last decade the Kondo effect has been intensively investigated in nanostructures [2-5]. Electronic transport in such the systems shows different features than those in the macroscopic system, where the characteristic feature is an increase of the resistivity with lowering a temperature. The effect is due to an increase of the relaxation time, an increase a role of spin-flip processes. In contrast in the quantum dot, the conductance increases and reaches the value 2e2/h at T=0, which means that electrons are then perfectly transmitted [6].  
         
     
         
         
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