Abstract
Abstract
The nuclear spin-lattice relaxation time T
1 of the ν = 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 T
1 of quantum Hall states around ν = 1 that possesses a Korringa-type temperature dependence, the temperature-independent short T
1 of the ν = 2 QHF suggests the presence of low energy collective spin excitations in a domain wall. Furthermore, T
1 of this ferromagnetic state is also found to be filling- and current-independent. The interpretation of these results as compared to the T
1 properties of other QHFs is discussed in terms of the domain wall skyrmion, which will lead to a better understanding of the QHF.
Funder
National Natural Science Foundation of China
Subject
General Physics and Astronomy
Cited by
3 articles.
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