Higher energy modes of Fractional quantum Hall Effect

We have calculated the energy spectra for almost all the filling fractions in the Jain series low energy fundamental mode as well as higher energy modes using composite fermion theory. The nature of the low energy mode and higher energy mode is nearly identical to the roton mode. We have observed that, these series of filling fractions $ν=\frac{n}{2pn+1}$ possess $n$ number of roton minima in their higher energy mode.

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