Schüller, Christian and Broocks, K.-B. and Schröter, P. and Heyn, Ch. and Heitmann, Detlef and Bichler, Max and Wegscheider, Werner and Chakraborty, Tapash and Apalkov, V. M. (2003) Optical Probing of a Fractionally Charged Quasihole in an Incompressible Liquid. Applied Physics Letters 91 (11; 4 ), 116403 .
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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:||11 September 2003|
|Institutions:||Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller|
|Keywords:||two-dimensional electron gas, photoluminescence, excitons, electric charge, quasiparticles, magnetic field effects, localised states, energy gap|
|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|