W. Pan, K.W. Baldwin, K.W. West, L.N. Pfeiffer, and D.C. Tsui

Scientific Achievement

We unambiguously confirm, for the first time, a new second-generation fractional quantum Hall effect (FQHE) state at Landau level filling n=4/11.

Significance and Impact

This confirmation opens the door for fundamental understanding the nature of the ground state of second generation FQHE states (e.g., electron correlation).

Research Details

–Carried out low temperature and high magnetic field electronic transport measurements in ultra-high mobility two-dimensional electron system.

–Observed quantized Hall plateau and thermally activated magneto-resistance at Landau level filling n=4/11.

–Measured energy gap at n=4/11, ~ 7 mK.

–Tilt magnetic field study shows that the 4/11 state is probably spin polarized, suggesting that it may be a new non-Abelian fractional quantum Hall state.