Energy Relaxation in the Integer Quantum Hall Regime

Details Energy Relaxation in the Integer Quantum Hall Regime Energy Relaxation in the Integer Quantum Hall Regime

2010-03-25

arxiv.org/abs/1003.4962v2

Phys. Rev. Lett. 105, 056803 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To be published in PRL, 10 pages including supplementary material

Scientific paper

10.1103/PhysRevLett.105.056803

We investigate the energy exchanges along an electronic quantum channel realized in the integer quantum Hall regime at filling factor $\nu_L=2$. One of the two edge channels is driven out-of-equilibrium and the resulting electronic energy distribution is measured in the outer channel, after several propagation lengths $0.8~\mu$m$\leq L\leq30~\mu$m. Whereas there are no discernable energy transfers toward thermalized states, we find efficient energy redistribution between the two channels without particle exchanges. At long distances $L\geq10~\mu$m, the measured energy distribution is a hot Fermi function whose temperature is lower than expected for two interacting channels, which suggests the contribution of extra degrees of freedom. The observed short energy relaxation length challenges the usual description of quantum Hall excitations as quasiparticles localized in one edge channel.

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