Abstract
In a quantum well of density we observed a fractional quantum Hall effect (FQHE) at and , and weaker states at , , , and . These sequences of fractions do not fit into the standard series of integral quantum Hall effects of composite fermions (CF) at . They rather can be regarded as the FQHE of CFs attesting to residual interactions between these composite particles. In tilted magnetic fields the state remains unchanged, strongly suggesting it to be spin polarized. The weak state vanishes quickly with tilt.
- Received 15 October 2001
DOI:https://doi.org/10.1103/PhysRevLett.90.016801
©2003 American Physical Society