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18 February 2025
 
  » arxiv » 1109.0102

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Upstream neutral modes in the fractional quantum Hall effect regime: heat waves or coherent dipoles
Y. Gross ; M. Dolev ; M. Heiblum ; V. Umansky ; D. Mahalu ;
Date 1 Sep 2011
AbstractChiral counter propagating (upstream) neutral edge modes, which were predicted to be present in hole-conjugate states [1], were observed recently in a variety of fractional quantum Hall states ( u=2/3, u=3/5, u=8/3, u=5/2), via measurement of excess noise resulting from partitioning of the modes [2, 3]. Particularly noticeable was the observation of such modes in the $ u=5/2$ fractional state - as it sheds light on the non-abelian nature of the state’s wavefunction. Yet, the nature of these unique, upstream, chargeless modes and the microscopic process in which they generate shot noise, are not understood. By studying the ubiquitous $ u=2/3$ state, we found that the excess noise that is being created by ’colliding’ two upstream neutral modes on a narrow constriction is consistent with a simple model of local heating. We report also on a dual process: partitioning a downstream charge mode gives birth to an upstream neutral mode. In this process, drawing energy from the charge mode at the partitioning constriction can be viewed as an inelastic scattering event, which is likely to dephase the partitioned quasiparticles.
Source arXiv, 1109.0102
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