Zero-Momentum Cyclotron Spin-Flip Mode in a Spin-Unpolarized Quantum Hall System
Abstract
We report on a study of the zero-momentum cyclotron spin-flip excitation in the V=2 quantum Hall regime. Using the excitonic representation the excitation energy is calculated up to the second order Coulomb corrections. A considerable negative exchange shift relative to the cyclotron gap is established for cyclotron spin-flip excitations in the the spin-unpolarized electronic system. Under these conditions this type of states presents the lowest-energy excitations. For a fixed filling factor V=2 the energy shift is independent of the magnetic field which is in agreement with recent experimental observations.
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