The nuclear spin-lattice relaxation time T1 of the nu = 2 quantum Hall ferromagnet (QHF) formed in a gate-controlled InSb two-dimensional electron gas has been characterized using a pump-probe technique. In contrast to a long T1 of quantum Hall states around nu = 1 that possesses a Korringa-type temperature dependence, the temperature-independent short T1 of the nu = 2 QHF suggests the presence of low energy collective spin excitations in a domain wall. Furthermore, T1 of this ferromagnetic state is also found to be filling- and current-independent. The interpretation of these results as compared to the T1 properties of other QHFs is discussed in terms of the domain wall skyrmion, which will lead to a better understanding of the QHF.
@article{arxiv.1903.07778,
title = {Pump-probe nuclear spin relaxation study of the quantum Hall ferromagnet at filling factor nu = 2},
author = {K. F. Yang and M. M. Uddin and K. Nagase and T. D. Mishima and M. B. Santos and Y. Hirayama and Z. N. Yang and H. W. Liu},
journal= {arXiv preprint arXiv:1903.07778},
year = {2019}
}
Comments
19 pages, 5 figures, including Supplementary Material