Direct Measurement of the g-Factor of Composite Fermions

Details Direct Measurement of the g-Factor of Composite Fermions Direct Measurement of the g-Factor of Composite Fermions

2003-09-22

arxiv.org/abs/cond-mat/0309505v2

Phys. Rev. Lett 92, 156401 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures Changed content: Fokus more on g-factors (and less on other details)

Scientific paper

10.1103/PhysRevLett.92.156401

The activation gap $\Delta$ of the fractional quantum Hall states at constant fillings $\nu =2/3$ and 2/5 has been measured as a function of the perpendicular magnetic field $B$. A linear dependence of $\Delta$ on $B$ is observed while approaching the spin polarization transition. This feature allows a direct measurement of the $g$-factor of composite fermions which appears to be heavily renormalized by interactions and strongly sensitive to the electronic filling factor.

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