Abstract
The spectrum of intersubband collective excitations of spin and charge density in a system of quasi-two-dimensional electrons is calculated in the strong magnetic field limit for filling factors υ≤4. For υ≤2 two new closely spaced modes of collective excitations are obtained. The modes obtained make it possible to give a new interpretation of the experimentally observed line, which is usually interpreted as being due to single-particle excitations.
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Pis’ma Zh. Éksp. Teor. Fiz. 69, No. 8, 543–547 (25 April 1999)