A new transport phenomenon in nanostructures: A mesoscopic analog of the   Braess paradox encountered in road networks
  The Braess paradox, known for traffic and other classical networks, lies in the fact that adding a new route to a congested network in an attempt to relieve congestion can counter-intuitively degrade the overall network performance. Recently, we have extended the concept of Braess paradox to semiconductor mesoscopic networks, whose transport properties are governed by quantum physics. In this paper, we demonstrate theoretically that, alike in classical systems, congestion plays a key role in the occurrence of a Braess paradox in mesoscopic networks. 
Marco Pala, Hermann Sellier, Benoit Hackens, Frederico Martins,   Vincent Bayot, Serge Huant
cond-mat.mes-hall