Flux period scaling in the Laughlin quasiparticle interferometer

Abstract

We report experiments on electron interferometer devices in the quantum Hall regime, where edge channels circle a 2D electron island. The main confinement is produced by etch trenches, into which front gate metal is deposited. We find a linear dependence of the Aharonov-Bohm period on gate voltage for electrons (integer filling f=1) and for Laughlin quasiparticles (fractional 2/5 embedded in 1/3). The capacitance of a large 2D electron island with respect to the front gates is approximately proportional to the island radius. Comparing the experimental data for the integer and the fractional fillings and for two samples, we find the magnetic field period and its slope scale with the radius of the Aharonov-Bohm orbit. Analysis of the directly measured integer and fractional slope data allows to determine the interferometer area in the fractional regime, and thus the Laughlin quasiparticle flux period of 5h/e, within the experimental accuracy.

arXiv commentpublished v3 replaces v2, that is a different paper

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Cited by in corpus (11)

• Primary-Filling e/3 Quasiparticle Interferometer
• Quantum transport in electron Fabry-Perot interferometers
• Aharanov-Bohm interference and fractional statistics in a quantum Hall interferometer
• Transport in the Laughlin quasiparticle interferometer: Evidence for topological protection in an anyonic qubit
• Theory of fractional quantum Hall interferometers
• Observation of quantum Hall interferometer phase jumps due to changing quasiparticle number
• Superperiods and quantum statistics of Laughlin quasiparticles
• Fractional Coulomb blockade for quasiparticle tunneling between edge channels
• Superperiods in interference of e/3 Laughlin quasiparticles encircling filling 2/5 fractional quantum Hall island
• Low-field quantum Hall transport in an electron Fabry-Perot interferometer: Determination of constriction filling vs front-gate voltage
• Experimental realization of Laughlin quasiparticle interferometers