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• W2014307580 endingPage "10418" @default.
• W2014307580 startingPage "10407" @default.
• W2014307580 abstract "The composite fermion (CF) model has been strikingly successful in describing many aspects of the fractional quantum Hall effect (FQHE) observed in two-dimensional electron systems (2DES). In the CF picture, the FQHE is the integer quantum Hall effect of the CFs. In order to assess the effect of an in-plane magnetic field on the CFs we have examined the temperature dependence of the oscillations in in a high-mobility GaAs - (Ga, Al)As heterojunction close to Landau level filling factors and for many different values of , the angle between the normal to the 2DES and the magnetic field. The CF energy gaps were evaluated at each angle using a variant of the Lifshitz - Kosevich approach. Close to , it was found that the CF gaps at each angle could be fitted to within experimental errors using a constant CF effective mass. However, the CF effective mass was found not to follow the -dependence expected for a purely 2D system; i.e. the CF energy gap at fixed grows markedly with increasing in-plane field. Around the situation is more complex, and the oscillations of the energy gaps at and as varied were interpreted using a recent model of two independent CF Landau fans separated by the Pauli spin splitting (Du R R, Yeh A S, Stormer H L, Tsui D C, Pfeiffer L N and West K W 1995 Phys. Rev. Lett. 75 3926). However, whilst the model qualitatively predicts some of the behaviour of the -minima, it is unable to account for the absolute sizes of the energy gaps. In order to reproduce the gaps at and quantitatively, an angle-dependent CF mass (as observed close to ) is required. The data suggest that the compression of the electronic wave function due to the in-plane field and exchange effects both play a role in determining the size of the CF gaps and cast doubts on the supposed `universal' behaviour of the CF mass." @default.
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• W2014307580 date "1996-12-02" @default.
• W2014307580 modified "2023-09-23" @default.
• W2014307580 title "On the dependence on the magnetic field orientation of the composite fermion effective mass" @default.
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• W2014307580 doi "https://doi.org/10.1088/0953-8984/8/49/029" @default.
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