title: Shot-noise signatures of 0.7 structure and spin in a quantum point contact.
abstract: We report simultaneous measurement of shot noise and dc transport in a quantum point contact as a function of source-drain bias, gate voltage, and in-plane magnetic field. Shot noise at zero field exhibits an asymmetry related to the 0.7 structure in conductance. The asymmetry in noise evolves smoothly into the symmetric signature of spin-resolved electron transmission at high field. Comparison to a phenomenological model with density-dependent level splitting yields good quantitative agreement.
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: L
authors.initials: L
authors.lastname: DiCarlo
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
authors.forename: D T
authors.initials: DT
authors.lastname: McClure
authors.forename: D J
authors.initials: DJ
authors.lastname: Reilly
authors.forename: C M
authors.initials: CM
authors.lastname: Marcus
authors.forename: L N
authors.initials: LN
authors.lastname: Pfeiffer
authors.forename: K W
authors.initials: KW
authors.lastname: West