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Regular version of the site

Article

Exchange energy renormalization in quantum Hall ferromagnets with strong Coulomb interaction

Physical Review B: Condensed Matter and Materials Physics. 2019. Vol. 100. No. 4. P. 041407-1-041407-5.
Vankov A., Kaysin B., Volosheniuk S., Kukushkin I.

An unusual behavior of the exchange energy scale of a quantum Hall ferromagnet with ν=1 was found in strongly correlated two-dimensional electron systems based on MgZnO/ZnO heterostructures. The exchange contribution, entering the energy of a collective excitation, was probed by means of inelastic light scattering. It was established that, in a wide range of electron densities corresponding to the Wigner-Seitz parameter 7<rs<11, this contribution is on the order of the cyclotron energy, which is notably different from the typical scale of e2/ɛℓB that is typical for weakly interacting systems. The same trend was confirmed via numerical calculations.