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Chin. Phys. B, 2015, Vol. 24(6): 067302    DOI: 10.1088/1674-1056/24/6/067302
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Disorder-enhanced nuclear spin relaxation at Landau level filling factor one

Guan Tonga, Benedikt Friessb, Li Yong-Qinga, Yan Shi-Shenc, Vladimir Umanskyd, Klaus von Klitzingb, Jurgen H. Smetb
a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100190, China;
b Max Planck Institute for Solid State Research, Heisenbergstraß1, D-70569, Stuttgart, Germany;
c School of Physics, Shandong University, Jinan 250100, China;
d Weizmann Institute of Science, Rehovot 76100, Israel
Abstract  

The nuclear spin relaxation rate (1/T1) is measured for GaAs two-dimensional (2D) electron systems in the quantum Hall regime with an all-electrical technique for agitating and probing the nuclear spins. A “tilted plateau” feature is observed near the Landau level filling factor ν=1 in 1/T1 versus ν. Both the width and magnitude of the plateau increase with decreasing electron density. At low temperatures, 1/T1 exhibits an Arrhenius temperature dependence within the tilted plateau regime. The extracted energy gaps are up to two orders of magnitude smaller than the corresponding charge transport gaps. These results point to a nontrivial mechanism for the disorder-enhanced nuclear spin relaxation, in which microscopic inhomogeneities play a key role for the low energy spin excitations related to skyrmions.

Keywords:  nuclear spin relaxation      Landau level filling factor one      skyrmions  
Received:  17 March 2015      Revised:  25 March 2015      Accepted manuscript online: 
PACS:  73.40.-c (Electronic transport in interface structures)  
  73.20.-r (Electron states at surfaces and interfaces)  
  73.63.Hs (Quantum wells)  
Fund: 

Project supported by the National Basic Research Program of China (Grant Nos. 2012CB921703 and 2015CB921102), the National Natural Science Foundation of China (Grant Nos. 91121003, 11374337, and 61425015), the Chinese Academy of Sciences, the BMBF, and the German-Israel Foundation.

Corresponding Authors:  Li Yong-Qing, Jurgen H. Smet     E-mail:  yqli@iphy.ac.cn;j.smet@fkf.mpg.de
About author:  73.40.-c; 73.20.-r; 73.63.Hs

Cite this article: 

Guan Tong, Benedikt Friess, Li Yong-Qing, Yan Shi-Shen, Vladimir Umansky, Klaus von Klitzing, Jurgen H. Smet Disorder-enhanced nuclear spin relaxation at Landau level filling factor one 2015 Chin. Phys. B 24 067302

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