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NEUTRAL Report Summary

Project ID: 339070
Funded under: FP7-IDEAS-ERC
Country: Israel

Mid-Term Report Summary - NEUTRAL (Neutral Quasi-Particles in Mesoscopic Physics)

Much of our efforts were concentrated in understanding energy flow (neutral modes) in the fractional quantum Hall effect. These, invisible, modes, may be responsible for decoherence of fractionally charged quasiparticles (as these heat modes were not detected in the integer quantum Hall effect). What we found is that such modes are more prevalent than expected: (i) They were found also in hole-like states 1<filling<1/2, and not solely, as was assumed before, only in particle-like states); (ii) They were found also in the bulk, and not only in a chiral motion along the edges’; (iii) In short enough propagation length, we found evidence for counter-propagating charge modes (and not neutral modes); (iv) When more than one chiral mode propagated along the edges, and the modes are not equilibrated, neutral mode will appear due to energy exchange; (v) A new effect - ‘pairing of electrons’ - was found in interference experiments. While the exact mechanism that causes this phenomenon is not clear, it is obvious that it is caused by interaction among nearby edge modes; (vi) The inter-mode interaction was exploited to perform a novel controlled dephasing experiment, “An Electronic Quantum Eraser”.

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