Role of exciton screening in the 7/3 fractional quantum Hall effect

The excitations of the 7/3 fractional Hall state, one of the most prominent states in the second Landau level, are not understood. We study the effect of screening by composite fermion excitons and find that it causes a strong renormalization at 7/3, thanks to a relatively small exciton gap and a re...

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Bibliographic Details
Published in:Physical review letters 2013-04, Vol.110 (18), p.186801-186801, Article 186801
Main Authors: Balram, Ajit C, Wu, Ying-Hai, Sreejith, G J, Wójs, Arkadiusz, Jain, Jainendra K
Format: Article
Language:English
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Summary:The excitations of the 7/3 fractional Hall state, one of the most prominent states in the second Landau level, are not understood. We study the effect of screening by composite fermion excitons and find that it causes a strong renormalization at 7/3, thanks to a relatively small exciton gap and a relatively large residual interaction between composite fermions. The excitations of the 7/3 state are to be viewed as composite fermions dressed by a large exciton cloud. Their wide extent has implications for experiments as well as for analysis of finite system exact diagonalization studies.
ISSN:0031-9007
1079-7114
1079-7114
DOI:10.1103/PhysRevLett.110.186801