Seminarium Fizyki Materii Skondensowanej

We theoretically study nonequilibrium edge state transport in thefractional quantum Hall regime for the \nu=2/3 states which hosts acounter-propagating neutral mode. We first consider a setup in which theneutral mode on one of the edges is heated by a hot spot, and where heattransported by the neutral mode causes a temperature difference betweenthe upper and lower edges in a Hall bar. This temperature difference isprobed by the excess noise it causes for scattering across a quantum pointcontact. We find that the excess noise in the quantum point contactprovidesevidence for the counter-propagating neutral mode, and we calculate itsdependence on both the temperature difference between the edges and onsource-drain bias. We also study noise enhancement when the neutral modeson both edges are heated, and make connections of our theoretical pictureto the recent heat transport experiment on the \nu=2/3 state(arXiv:1109.0102).