Negative Excess Shot Noise by Anyon Braiding

• Published in: Physical review letters Vol. 123; no. 1; p. 016803
• Main Authors: Lee, Byeongmok, Han, Cheolhee, Sim, H-S
• Format: Journal Article
• Language: English
• Published: United States 03.07.2019
• ISSN: 1079-7114
• DOI: 10.1103/PhysRevLett.123.016803

Anyonic fractional charges e^{*} have been detected by autocorrelation shot noise at a quantum point contact (QPC) between two fractional quantum Hall edges. We find that the autocorrelation noise can also show a fingerprint of Abelian anyonic fractional statistics. We predict the noise of the electrical tunneling current I at the QPC of the fractional-charge detection setup, when anyons are dilutely injected, from an additional edge biased by a voltage, to the setup in equilibrium. At large voltages, the nonequilibrium noise is reduced below the thermal equilibrium noise by the value 2e^{*}I. This negative excess noise is opposite to the positive excess noise 2e^{*}I of the conventional fractional-charge detection and also to the usual positive autocorrelation noises of electrical currents. This is a signature of Abelian fractional statistics, resulting from the effective braiding of an anyon thermally excited at the QPC around another anyon injected from the additional edge.