Which tunnel faster across a quantum Hall strip: fractional charges or electrons?

Details Which tunnel faster across a quantum Hall strip: fractional charges or electrons? Which tunnel faster across a quantum Hall strip: fractional charges or electrons?

1997-07-31

arxiv.org/abs/cond-mat/9707331v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 Postscript Figures, uses epsf and psfig

Scientific paper

The tunneling rate of fractional charge across a Laughlin state on the cylinder is computed numerically. The decay with strip width Y is fitted to exp[- a (Y/ l)**2/12] where l is the Landau length, and a is approximately 1.0. This rate is exponentially LARGER than the electron tunneling rate and can be interpreted by analogy to a superfluid vortex tunneling problem. Experimental implications include the ``law of corresponding states'', periodicity of Aharonov-Bohm resistance oscillations and charge measurements by quantum shot noise.

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