Bootsmann, M.-T. and Hu, C. M. and Heyn, Ch. and Heitmann, Detlef and Schüller, Christian (2003) Acoustic plasmons and indirect intersubband excitations in tunneling-coupled GaAs-AlxGa1ÀxAs double quantum wells. Physical Review B (PRB) 67; 4 , p. 121309.
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In photoluminescence spectroscopy of a low-mobility two-dimensional electron gas subjected to a quantizing magnetic field, we observe an anomaly around nu= (1/3) at a very low temperature (0.1 K) and an intermediate electron density (0.9×1011 cm–2). The anomaly is explained as due to perturbation of the incompressible liquid at the Laughlin state due to close proximity of a localized charged exciton which creates a fractionally charged quasihole in the liquid. The anomaly of ~2 meV can be destroyed by applying a small thermal energy of ~0.2 meV that is enough to close the quasihole energy gap.
|Date:||31 March 2003|
|Institutions:||Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller|
|Keywords:||gallium arsenide, aluminium compounds, III-V semiconductors, semiconductor quantum wells, plasmons, light scattering, carrier density, RPA calculations|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||21 Sep 2009 07:14|
|Last Modified:||20 Jul 2011 21:44|