Experimental evidence for new particles in the fractional quantum hall effect

R. R. Du, H. L. Stormer, D. C. Tsui, L. N. Pfeiffer, K. W. West

Research output: Contribution to journalArticlepeer-review

346 Scopus citations


We have determined the energy gaps of both prominent sequences of fractional quantum Hall effect of (FQHE) states at filling factor ν=p/(2p±1) around ν=1/2. The gaps increase linearly with ΔB, the deviation of the magnetic field from half filling. Therefore, the data are indistinguishable from Shubnikov-de Haas oscillations of particles of charge e, effective mass m*, and lifetime broadening Γ exposed to an effective magnetic field ΔB. Our findings are remarkably consistent with recent proposals of composite particles in the FQHE and the existence of a Fermi surface at even-denominator fillings.

Original languageEnglish (US)
Pages (from-to)2944-2947
Number of pages4
JournalPhysical review letters
Issue number19
StatePublished - 1993

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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