Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-09-04
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Final version. To appear in PRB
Scientific paper
10.1103/PhysRevB.79.125312
We experimentally investigate interference effects in transport across a single incompressible strip at the edge of the quantum Hall system by using a Fabry-Perot type interferometer. We find the interference oscillations in transport across the incompressible strips with local filling factors $\nu_c=1, 4/3, 2/3$ even at high imbalances, exceeding the spectral gaps. In contrast, there is no sign of the interference in transport across the principal Laughlin $\nu_c=1/3$ incompressible strip. This indicates, that even at fractional $\nu_c$, the interference effects are caused by "normal" electrons. The oscillation's period is determined by the effective interferometer area, which is sensitive to the filling factors because of screening effects.
Biasiol Giorgio
Deviatov E. V.
Lorke Axel
Marquardt B.
Sorba Lucia
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