Proliferation of neutral modes in fractional quantum Hall states

Hiroyuki Inoue, Anna Grivnin, Yuval Ronen, Moty Heiblum (), Vladimir Umansky and Diana Mahalu
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Hiroyuki Inoue: Braun Center for Submicron Research, Weizmann Institute of Science
Anna Grivnin: Braun Center for Submicron Research, Weizmann Institute of Science
Yuval Ronen: Braun Center for Submicron Research, Weizmann Institute of Science
Moty Heiblum: Braun Center for Submicron Research, Weizmann Institute of Science
Vladimir Umansky: Braun Center for Submicron Research, Weizmann Institute of Science
Diana Mahalu: Braun Center for Submicron Research, Weizmann Institute of Science

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract The fractional quantum Hall effect is a canonical example of topological phases. While electric currents flow downstream in edge modes, neutral edge modes, observed only in hole-conjugate states and in ν=5/2, flow upstream. It is believed that the latter transport results from multiple counter-propagating channels—mixed by disorder that is accompanied by Coulomb interaction. Here we report on sensitive shot noise measurements that reveal unexpected presence of neutral modes in non-hole-conjugate fractional states; however, not in the integer states. Furthermore, the incompressible bulk is also found to allow energy transport. While density reconstructions along the edge may account for the energy carrying edge modes, the origin of the bulk energy modes is unidentified. The proliferation of neutral modes changes drastically the accepted transport picture of the fractional quantum Hall effects. Their apparent ubiquitous presence may explain the lack of interference of fractional quasiparticles—preventing observation of fractional statistics.

Date: 2014
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DOI: 10.1038/ncomms5067

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