title: Charge fractionalization in the integer quantum Hall effect.
abstract: We report an observation, via sensitive shot noise measurements, of charge fractionalization of chiral edge electrons in the integer quantum Hall effect regime. Such fractionalization results solely from interchannel Coulomb interaction, leading electrons to decompose to excitations carrying fractional charges. The experiment was performed by guiding a partitioned current carrying edge channel in proximity to another unbiased edge channel, leading to shot noise in the unbiased edge channel without net current, which exhibited an unconventional dependence on the partitioning. The determination of the fractional excitations, as well as the relative velocities of the two original (prior to the interaction) channels, relied on a recent theory pertaining to this measurement. Our result exemplifies the correlated nature of multiple chiral edge channels in the integer quantum Hall effect regime.
authors.affiliation: Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, 79100 Rehovot, Israel.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Inoue
authors.affiliation: Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, 79100 Rehovot, Israel.
authors.forename: Anna
authors.initials: A
authors.lastname: Grivnin
authors.affiliation: Departments of Physics and Applied Physics, Yale University, New Haven, Connecticut 06520, USA.
authors.forename: Nissim
authors.initials: N
authors.lastname: Ofek
authors.affiliation: Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, 69978 Tel Aviv, Israel.
authors.forename: Izhar
authors.initials: I
authors.lastname: Neder
authors.affiliation: Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, 79100 Rehovot, Israel.
authors.forename: Moty
authors.initials: M
authors.lastname: Heiblum
authors.affiliation: Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, 79100 Rehovot, Israel.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Umansky
authors.affiliation: Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, 79100 Rehovot, Israel.
authors.forename: Diana
authors.initials: D
authors.lastname: Mahalu