Activation energies for spin-reversed excitations in the fractional quantum Hall effect - art. no. 125310

The activation energy measured in transport experiments in the fractional H all regime corresponds to the energy required to create a far separated par ticle hole pair. We calculate, for several fractional quantum Hall states, the energy gaps for the excitation in which the excited composite fermion r everses its spin-quantum number. Our results indicate that such spin-revers ed excitations may be relevant in experimentally accessible regimes.