What determines the fermi wave vector of composite fermions?

D. Kamburov, Yang Liu, M. A. Mueed, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin

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Abstract

Composite fermions (CFs), exotic particles formed by pairing an even number of flux quanta to each electron, provide a fascinating description of phenomena exhibited by interacting two-dimensional electrons at high magnetic fields. At and near Landau level filling ν=1/2, CFs occupy a Fermi sea and exhibit commensurability effects when subjected to a periodic potential modulation. We observe a pronounced asymmetry in the magnetic field positions of the commensurability resistance minima of CFs with respect to the field at ν=1/2. This unexpected asymmetry is consistent with the CFs' Fermi wave vector being determined by the minority carriers in the lowest Landau level, and suggests a breaking of the particle-hole symmetry for CFs near ν=1/2.

Original languageEnglish (US)
Article number196801
JournalPhysical review letters
Volume113
Issue number19
DOIs
StatePublished - Nov 6 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Kamburov, D., Liu, Y., Mueed, M. A., Shayegan, M., Pfeiffer, L. N., West, K. W., & Baldwin, K. W. (2014). What determines the fermi wave vector of composite fermions? Physical review letters, 113(19), [196801]. https://doi.org/10.1103/PhysRevLett.113.196801