Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-12-06
Phys. Rev. Lett. 108, 076802 (2012)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
2nd version with minor stylistic corrections. To appear in Phys. Rev. Lett.: Editorially approved for publication 6 January 20
Scientific paper
10.1103/PhysRevLett.108.076802
We present evidence for a counter-intuitive behavior of semiconductor mesoscopic networks that is the analog of the Braess paradox encountered in classical networks. A numerical simulation of quantum transport in a two-branch mesoscopic network reveals that adding a third branch can paradoxically induce transport inefficiency that manifests itself in a sizable conductance drop of the network. A scanning-probe experiment using a biased tip to modulate the transmission of one branch in the network reveals the occurrence of this paradox by mapping the conductance variation as a function of the tip voltage and position.
Baltazar Samuel
Bayot Vincent
Desplanque Ludovic
Hackens Benoit
Huant Serge
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