Dynamical properties of a two-dimensional electron gas in a magnetic field within the composite fermion model

D. J T Leonard, Neil F Johnson

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We investigate the response of a two-dimensional electron gas, in the fractional quantum Hall regime, to the sudden appearance of a localized charged probe using the Chern-Simons theory of composite fermions. The dynamic structure factor of the electron gas is found to have a major influence on the spectral function of the probe. In particular, there is an orthogonality catastrophe when the filling factor is an even-denominator filling fraction due to the compressibility of the state, but there is no catastrophe at odd-denominator filling factors because these states have a gap to excitations. The catastrophe is found to be more severe for composite fermions in zero effective magnetic field than it is for electrons in zero real magnetic field. Oscillations in the spectral function, arising when the composite fermions are at integer filling, have a period equal to the composite fermion cyclotron energy. We propose a tunneling experiment which directly measures the spectral function from which one could determine the composite fermion effective mass.

Original languageEnglish (US)
Pages (from-to)15468-15482
Number of pages15
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume58
Issue number23
StatePublished - Dec 15 1998
Externally publishedYes

Fingerprint

Two dimensional electron gas
Fermions
electron gas
fermions
Magnetic fields
composite materials
Composite materials
magnetic fields
Electron gas
probes
orthogonality
Cyclotrons
Compressibility
compressibility
integers
cyclotrons
oscillations
Electrons
excitation
electrons

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Dynamical properties of a two-dimensional electron gas in a magnetic field within the composite fermion model. / Leonard, D. J T; Johnson, Neil F.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 58, No. 23, 15.12.1998, p. 15468-15482.

Research output: Contribution to journalArticle

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