Schüller, Christian and Broocks, Kay-Birger and Schröter, Patrick and Heyn, Christian and Heitmann, Detlef and Bichler, Max and Wegscheider, Werner and Chakraborty, Tapash and Apalkov, V. M.
Optical Probing of a Fractionally Charged Quasihole in an Incompressible Liquid.
Physical Review Letters (PRL) 91 (11), 116403 .
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:||12 September 2003|
|Institutions:|| Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider|
|71.30.+h, 73.43.Lp, 73.63.Kv ||PACS|
|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:||08 Feb 2010 13:31|
|Last Modified:||20 Jul 2011 22:19|