Équipe de Recherche en Physique de l'Information Quantique


Abstract = {In a high magnetic field, electrons confined to two dimensions form highly correlated states driven entirely by electron-electron interactions. Transport and cyclotron-resonance experiments on these fractional quantum Hall effect states, and the associated fractionally charged excitations, suggest the existence of composite fermions-electrons with two flux quanta attached. Using optical spectroscopy, 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 v = 1/2, and fractionally charged excitations lead to fractionally charged excitons. In the vicinity of the incompressible v = 1/3 state we observe a doublet structure in the emission line, corresponding to excitations of the incompressible fluid. At filling factors v > 1/3, corresponding to the transition to a compressible metallic state, a new emission line appears, which we attribute to the fractionally charged quasi-exciton. {\copyright}2006 Nature Publishing Group.},
Author = {Byszewski, M. and Chwalisz, B. and Maude, D.K. and Sadowski, M.L. and Potemski, M. and Saku, T. and Hirayama, Y. and Studenikin, S. and Austing, D.G. and Sachrajda, A.S. and Hawrylak, P.},
Document_Type = {Article},
Journal = {Nature Physics},
Number = {4},
Pages = {239-243},
Source = {Scopus},
Title = {Optical probing of composite fermions in a two-dimensional electron gas},
Url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33645785283&partnerID=40&md5=f46bdd6affd8d4a04c30aeca50a1ef2d},
Volume = {2},
Year = {2006},
Bdsk-Url-1 = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33645785283&partnerID=40&md5=f46bdd6affd8d4a04c30aeca50a1ef2d}}