Skyrmion liquid phase of the quantum ferromagnet in two dimensions
Instituto de Ciencia de Materiales (CSIC ),
Universidad Autonoma de Madrid Cantoblanco, 28049 Madrid, Spain
Accepted: 4 March 1998
The two-dimensional quantum ferromagnet filled with a liquid of skyrmions is studied theoretically in the context of the quantum Hall effect near electronic filling factor . A crossover between the classical ferromagnetic phase at and a classical paramagnetic phase at is obtained, which is consistent with recent Knight-shift measurements. A new collective mode associated with the skyrmion liquid that is of the cyclotron type is also identified.
PACS: 73.40.Hm – Quantum Hall effect (integer and fractional) / 75.10.Jm – Quantized spin models / 75.40.Cx – Static properties
© EDP Sciences, 1998