TY - JOUR
T1 - Scanning nuclear resonance imaging of a hyperfine-coupled quantum Hall system
AU - Hashimoto, Katsushi
AU - Tomimatsu, Toru
AU - Sato, Ken
AU - Hirayama, Yoshiro
N1 - Funding Information:
We thank K. Muraki and NTT for supplying high-quality wafers, T. Taninaka and S. Shirai for the sample preparation, and M. Kawamura, T. Machida, N. Kumda, M.H. Fauzi, J.F. Ribeiro, G. Yusa, and J.N. Moore for the helpful discussions. K.H. acknowledges JSPS for financial support (KAKENHI 26390006, 17H02728). Y.H. acknowledges support from JSPS (KAKENHI 15H0586, 15K217270, and 26287059) and Tohoku University, WPI-AIMR. K.H. and Y.H. thank Tohoku University’s GP-Spin program for their support.
Publisher Copyright:
© 2018 The Author(s).
PY - 2018/12/1
Y1 - 2018/12/1
N2 - Nuclear resonance (NR) is widely used to detect and characterise nuclear spin polarisation and conduction electron spin polarisation coupled by a hyperfine interaction. While the macroscopic aspects of such hyperfine-coupled systems have been addressed in most relevant studies, the essential role of local variation in both types of spin polarisation has been indicated in 2D semiconductor systems. In this study, we apply a recently developed local and highly sensitive NR based on a scanning probe to a hyperfine-coupled quantum Hall (QH) system in a 2D electron gas subject to a strong magnetic field. We succeed in imaging the NR intensity and Knight shift, uncovering the spatial distribution of both the nuclear and electron spin polarisation. The results reveal the microscopic origin of the nonequilibrium QH phenomena, and highlight the potential use of our technique in microscopic studies on various electron spin systems as well as their correlations with nuclear spins.
AB - Nuclear resonance (NR) is widely used to detect and characterise nuclear spin polarisation and conduction electron spin polarisation coupled by a hyperfine interaction. While the macroscopic aspects of such hyperfine-coupled systems have been addressed in most relevant studies, the essential role of local variation in both types of spin polarisation has been indicated in 2D semiconductor systems. In this study, we apply a recently developed local and highly sensitive NR based on a scanning probe to a hyperfine-coupled quantum Hall (QH) system in a 2D electron gas subject to a strong magnetic field. We succeed in imaging the NR intensity and Knight shift, uncovering the spatial distribution of both the nuclear and electron spin polarisation. The results reveal the microscopic origin of the nonequilibrium QH phenomena, and highlight the potential use of our technique in microscopic studies on various electron spin systems as well as their correlations with nuclear spins.
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U2 - 10.1038/s41467-018-04612-y
DO - 10.1038/s41467-018-04612-y
M3 - Article
C2 - 29880822
AN - SCOPUS:85048214757
VL - 9
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
M1 - 2215
ER -