Positive correlation in multi-level transport through a tunable quantum dot

ORAL

Abstract

We report measurements of shot noise auto- and cross- correlation in a tunable quantum dot with two or three leads. As the Coulomb blockade is lifted at finite source-drain bias, the current noise evolves from super-Poissonian to sub- Poissonian in the two-lead case, and the cross-correlation evolves from positive to negative in the three-lead case. The observed super-Poissonian noise and positive cross-correlation are shown to be consistent with transport through excited states.

*We acknowledge support from the NSF through the Harvard NSEC, PHYS 01-17795, DMR-05-41988, DMR-0501796, as well as support from NSA/DTO and Harvard University.

–

Authors

  • Yiming Zhang

    • Harvard University

  • Leonardo DiCarlo

    • Harvard University

  • Douglas McClure

    • Harvard University

  • Michihisa Yamamoto

    • University of Tokyo and SORST-JST

  • Seigo Tarucha

    • University of Tokyo and ICORP-JST

  • Charles Marcus

    • Harvard University

  • Micah Hanson

    • University of California, Santa Barbara

  • Art Gossard

    • University of California, Santa Barbara