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Charge tunneling in fractional edge channels (Articolo in rivista)

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Ferraro, D; Braggio, A; Magnoli, N; Sassetti, M (2010)
Charge tunneling in fractional edge channels
in Physical review. B, Condensed matter and materials physics
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\"[Ferraro, D.; Magnoli, N.; Sassetti, M.] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy; [Ferraro, D.; Magnoli, N.] Univ Genoa, Ist Nazl Fis Nucl, I-16146 Genoa, Italy; [Braggio, A.; Sassetti, M.] CNR-SPIN, Via Dodecaneso 33 I-16146 Genoa, Italy (literal)

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We explain recent experimental observations on effective charge of edge states tunneling through a quantum point contact in the weak backscattering regime. We focus on the behavior of the excess noise and on the effective tunneling charge as a function of temperature and voltage. By introducing a minimal hierarchical model different filling factors, v=p/(2p+ 1), in the Jain sequence are treated on equal footing, in presence also of nonuniversal interactions. The agreement found with the experiments for v=2/3 and v=2/5 reinforces the description of tunneling of bunching of quasiparticles at low energies and quantitatively defines the condition under which one expects to measure the fundamental quasiparticle charge. We propose high-order current cumulant measurement to cross-check the validity of the above scenario and to better clarify the peculiar temperature behavior of the effective charges measured in the experiments. (literal)

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