Shot-Noise Signatures of 0.7 Structure and Spin in a Quantum Point Contact

Details Shot-Noise Signatures of 0.7 Structure and Spin in a Quantum Point Contact Shot-Noise Signatures of 0.7 Structure and Spin in a Quantum Point Contact

2006-04-02

arxiv.org/abs/cond-mat/0604019v2

Phys. Rev. Lett. 97, 036810 (2006).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

related papers at http://marcuslab.harvard.edu

Scientific paper

10.1103/PhysRevLett.97.036810

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.

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