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VOLUME 51 (1990) | ISSUE 11 | PAGE 575
Magnetooptics of incompressible Fermi liquid in ultraquantum limit
The radiative recombination of 2D electrons with photoexcited holes localized in a monolayer of acceptors has been studied in a GaAs-AlGaAs heterostructure in a strong transverse magnetic field £f<28 Τ at low temperatures, 7>400 mK. At filling factors ν < 1, a variation of Η causes the spectral position of the luminescence line corresponding to the recombination of 2D electrons from the state lower in terms of spin to undergo discontinuous changes along the energy scale at the fractional values ν = 2/3,1/3,4/5,3/5,2/5,1/5,1/7, and 1/9. These structural features disappear as jTis increased. They are attributed to jumps in the chemical potential in the interacting system of electrons upon condensation into an incompressible Fermi liquid.