Author: ["M. Byszewski","B. Chwalisz","D. K. Maude","M. L. Sadowski","M. Potemski","T. Saku","Y. Hirayama","S. Studenikin","D. G. Austing","A. S. Sachrajda","P. Hawrylak"]
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Abstract
In a high magnetic field, electrons confined to two dimensions form highly correlated states driven entirely by electron–electron interactions1,2,3. Transport and cyclotron-resonance experiments4,5,6,7,8,9,10,11,12 on these fractional quantum Hall effect states, and the associated fractionally charged excitations, suggest the existence of composite fermions—electrons with two flux quanta attached4,5,6,7,8,9,10,11,12. Using optical spectroscopy13,14,15,16,17,18,19, we show that the two flux quanta in a composite fermion interacting with an exciton (a bound state of an electron and a hole) lead to filling-factor-dependent features in the optical emission spectrum, which are symmetric around filling factor ν=1/2, and fractionally charged excitations lead to fractionally charged excitons. In the vicinity of the incompressible ν=1/3 state we observe a doublet structure in the emission line, corresponding to excitations of the incompressible fluid. At filling factors ν>1/3, corresponding to the transition to a compressible metallic state20, a new emission line appears, which we attribute to the fractionally charged quasi-exciton.Cite this article
Byszewski, M., Chwalisz, B., Maude, D. et al. Optical probing of composite fermions in a two-dimensional electron gas. Nature Phys 2, 239–243 (2006). https://doi.org/10.1038/nphys273 