Bunching of fractionally charged quasiparticles tunnelling through high-potential barriers

Nature
E ComfortiD Mahalu

Abstract

Shot noise measurements have been used to measure the charge of quasiparticles in the fractional quantum Hall (FQH) regime. To induce shot noise in an otherwise noiseless current of quasiparticles, a barrier is placed in its path to cause weak backscattering. The measured shot noise is proportional to the charge of the quasiparticles; for example, at filling factor v=1/3, noise corresponding to q=e/3 appears. For increasingly opaque barriers, the measured charge increases monotonically, approaching q=e asymptotically. It was therefore believed that only electrons, or alternatively, three bunched quasiparticles, can tunnel through high-potential barriers encountered by a noiseless current of quasiparticles. Here we investigate the interaction of e/3 quasiparticles with a strong barrier in FQH samples and find that bunching of quasiparticles in the strong backscattering limit depends on the average dilution of the quasiparticle current. For a very dilute current, bunching ceases altogether and the transferred charge approaches q=e/3. This surprising result demonstrates that quasiparticles can tunnel individually through high-potential barriers originally thought to be opaque for them.

References

Jun 1, 1989·Geburtshilfe und Frauenheilkunde·W WürfelW Krüsmann
Jan 31, 1994·Physical Review Letters·C L Kane, M P Fisher
Apr 9, 1999·Science·W D OliverY Yamamoto
Oct 21, 2000·Physical Review Letters·T G GriffithsV Umansky
Aug 23, 2002·Physical Review Letters·E ComfortiAnd V Umansky

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Citations

Apr 1, 2016·Nature Communications·Cheolhee HanH-S Sim
Sep 28, 2004·Physical Review Letters·Emiliano Papa, A H MacDonald
Jun 29, 2005·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Jaeuk U KimMahn-Soo Choi
Mar 16, 2007·Physical Review Letters·O ZarchinV Umansky
Feb 24, 2015·Physical Review Letters·Masayuki HashisakaToshimasa Fujisawa
Nov 9, 2019·Physical Review Letters·Suraj S HegdeSmitha Vishveshwara
Aug 7, 2019·Physical Review Letters·Byeongmok LeeH-S Sim
Aug 9, 2003·Physical Review Letters·A KoutouzaB Trauzettel
Oct 4, 2005·Physical Review Letters·Elad ShopenYigal Meir
Feb 7, 2003·Physical Review Letters·Stefano RoddaroGiovanni Vignale
Dec 20, 2003·Physical Review Letters·Y C ChungV Umansky
May 21, 2021·Reports on Progress in Physics·D E Feldman, Bertrand I Halperin

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