title: Transport inefficiency in branched-out mesoscopic networks: an analog of the Braess paradox.
abstract: We present evidence for a counterintuitive 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.
authors.affiliation: IMEP-LAHC, Grenoble INP, Minatec, BP 257, Grenoble, France. pala@minatec.inpg.fr
authors.forename: M G
authors.initials: MG
authors.lastname: Pala
authors.forename: S
authors.initials: S
authors.lastname: Baltazar
authors.forename: P
authors.initials: P
authors.lastname: Liu
authors.forename: H
authors.initials: H
authors.lastname: Sellier
authors.forename: B
authors.initials: B
authors.lastname: Hackens
authors.forename: F
authors.initials: F
authors.lastname: Martins
authors.forename: V
authors.initials: V
authors.lastname: Bayot
authors.forename: X
authors.initials: X
authors.lastname: Wallart
authors.forename: L
authors.initials: L
authors.lastname: Desplanque
authors.forename: S
authors.initials: S
authors.lastname: Huant