Energy Relaxation in the Integer Quantum Hall Regime

Abstract

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$\le L\le 30\mu$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 $L\ge 10\mu$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.

To be published in PRL, 10 pages including supplementary material

References in corpus (14)

• Direct measurement of the coherence length of edge states in the Integer Quantum Hall Regime
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• Dephasing in the electronic Mach-Zehnder interferometer at filling factor 2
• Decoherence and single electron charging in an electronic Mach-Zehnder interferometer
• Shot noise of a mesoscopic two-particle collider
• Plasmon scattering approach to energy exchange and high frequency noise in nu=2 quantum Hall edge channels
• Resonant dephasing in the electronic Mach-Zehnder interferometer
• Decoherence and interactions in an electronic Mach-Zehnder interferometer
• Noise dephasing in the edge states of the Integer Quantum Hall regime
• Voltage-controlled Group Velocity of Edge Magnetoplasmon in the Quantum Hall Regime
• Mesoscopic one-way channels for quantum state transfer via the Quantum Hall Effect
• Nonequilibrium Dephasing in an Electronic Mach-Zehnder Interferometer
• Interaction induced edge channel equilibration
• Optical absorption to probe the quantum Hall ferromagnet at filling factor $\nu =1$

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