Exchange energy renormalization in quantum Hall ferromagnets with strong Coulomb interaction
Abstract
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/ɛ ℓB that is typical for weakly interacting systems. The same trend was confirmed via numerical calculations.
- Publication:
-
Physical Review B
- Pub Date:
- July 2019
- DOI:
- 10.1103/PhysRevB.100.041407
- Bibcode:
- 2019PhRvB.100d1407V