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arXiv · 1903.07778

Pump-probe nuclear spin relaxation study of the quantum Hall ferromagnet at filling factor nu = 2

K. F. Yang·M. M. Uddin·K. Nagase·T. D. Mishima·M. B. Santos·Y. Hirayama·Z. N. Yang·H. W. Liu
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Abstract

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.

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K. F. Yang, M. M. Uddin, K. Nagase, T. D. Mishima, M. B. Santos, Y. Hirayama, Z. N. Yang, H. W. Liu. 2019-08-19. Pump-probe nuclear spin relaxation study of the quantum Hall ferromagnet at filling factor nu = 2. https://doi.org/10.1088/1367-2630%2Fab34ce

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