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Interactions Suppress Quasiparticle Tunneling at Hall Bar Constrictions

2004; American Physical Society; Volume: 93; Issue: 12 Linguagem: Inglês

10.1103/physrevlett.93.126801

1092-0145

Emiliano Papa, A. H. MacDonald,

Magnetic properties of thin films

Tunneling of fractionally charged quasiparticles across a two-dimensional electron system on a fractional quantum Hall plateau is expected to be strongly enhanced at low temperatures. This theoretical prediction is at odds with recent experimental studies of samples with weakly pinched quantum-point-contact constrictions in which the opposite behavior is observed. We argue here that this unexpected finding is a consequence of electron-electron interactions near the point contact.