2014/09/22 by Anna Grivnin, Hiroyuki Inoue, Yuval Ronen +6 · 1 citation
Physics and Astronomy · #Atomic and Subatomic Physics Research #Atomic physics #Charge (physics) #Condensed matter physics #Conductance #Electron #Enhanced Data Rates for GSM Evolution #Fractional quantum Hall effect #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum Hall effect #Quantum and electron transport phenomena #Quantum mechanics #Quantum spin Hall effect #Telecommunications #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.113.266803
published as Phys. Rev. Lett. 113, (2014) 266803 · 9 pages, 4 figures, supplemental material
arxiv created 2014/09/22 · openalex publication_date 2014/12/22 · arxiv updated 2015/01/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
It is well established that density reconstruction at the edge of a two-dimensional electron gas takes place for hole-conjugate states in the fractional quantum Hall effect (such as v=2/3, 3/5, etc.). Such reconstruction leads, after equilibration between counterpropagating edge channels, to a downstream chiral current edge mode accompanied by upstream chiral neutral modes (carrying energy without net charge). Short equilibration length prevented thus far observation of the counterpropagating current channels-the hallmark of density reconstruction. Here, we provide evidence for such nonequilibrated counterpropagating current channels, in short regions (l=4 μm and l=0.4 μm) of fractional filling v=2/3 and, unexpectedly, v=1/3, sandwiched between two regions of integer filling v=1. Rather than a two-terminal fractional conductance, the conductance exhibited a significant ascension towards unity quantum conductance (GQ=e(2)/h) at or near the fractional plateaus. We attribute this conductance rise to the presence of a nonequilibrated channel in the fractional short regions.