Anomalously low magnetoroton energies of the unconventional fractional quantum Hall States of composite fermions.
We show a generic formation of the primary magnetorotons in the collective modes of the observed "unconventional" fractional quantum Hall effect states of the composite fermions at the filling factors 4/11, 4/13, 5/13, 5/17, and 3/8 at very low wave vectors with anomalously low energies which do not have any analog to the conventional fractional quantum Hall states. Rather slow decay of the oscillations of the pair-correlation functions in these states is responsible for the low-energy magnetorotons. This is a manifestation of the distinct topology predicted previously for these fractional quantum Hall effect states. Experimental consequences of our theory are also discussed.
Department of Theoretical Physics, Indian Association for the Cultivation of Science, Kolkata 700032, India.
Sutirtha
S
Mukherjee
Department of Theoretical Physics, Indian Association for the Cultivation of Science, Kolkata 700032, India.
Sudhansu S
SS
Mandal