Optical probing of a fractionally charged quasihole in an incompressible liquid.
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 x 10(11) 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 approximately 2 meV can be destroyed by applying a small thermal energy of approximately 0.2 meV that is enough to close the quasihole energy gap.
Schüller
C
C
Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, D-20355 Hamburg, Germany.
Broocks
K-B
KB
Schröter
P
P
Heyn
Ch
Ch
Heitmann
D
D
Bichler
M
M
Wegscheider
W
W
Chakraborty
Tapash
T
Apalkov
V M
VM