TY - JOUR
T1 - Resistively detected NMR in a triple-gate quantum point contact
T2 - Magnetic field dependence
AU - Noorhidayati, Annisa
AU - Fauzi, Mohammad Hamzah
AU - Sahdan, Muhammad Fauzi
AU - Maeda, Shunta
AU - Sato, Ken
AU - Nagase, Katsumi
AU - Hirayama, Yoshiro
N1 - Funding Information:
We would like to thank K. Muraki of NTT Basic Research Laboratory for supplying high quality wafers for this study. A.N. is supported by a MEXT scholarship for IGPAS student at Tohoku University. K.N. and Y.H. acknowledge support from the Graduate Program in Spintronics, Tohoku University. Y.H. acknowledge financial support from KAKENHI Grants No. 18H01811, No. 15H05867, and No. 15K21727. M.H.F. acknowledge financial support from KAKENHI Grant No. 17H02728.
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/1/28
Y1 - 2020/1/28
N2 - We report a resistively detected nuclear magnetic resonance (RDNMR) measurement in a GaAs-based quantum point contact in the quantum Hall breakdown regime. We focus on the detection of the As75 RDNMR signal at different perpendicular magnetic fields in the presence of electrons occupying the lowest Landau level. We confirm successful RDNMR detection down to B=1.25T (B=3.5T) using a high-mobility (low-mobility) device. All the RDNMR signals exhibit a threefold spectra attributed to electric quadrupole interaction. We find that the separation between the central transition and its satellite, Δf≈20kHz, remains unaffected by magnetic-field variation. Interestingly, the central NMR linewidths vary with the field strength. Above B=3T, the linewidth tends to saturate around 13 kHz. Below B=3T, the linewidth decreases in proportion with field and approaches a lower limit of 1 kHz corresponding to the GaAs nuclear dipole interaction as the field decreases to B=1.25T.
AB - We report a resistively detected nuclear magnetic resonance (RDNMR) measurement in a GaAs-based quantum point contact in the quantum Hall breakdown regime. We focus on the detection of the As75 RDNMR signal at different perpendicular magnetic fields in the presence of electrons occupying the lowest Landau level. We confirm successful RDNMR detection down to B=1.25T (B=3.5T) using a high-mobility (low-mobility) device. All the RDNMR signals exhibit a threefold spectra attributed to electric quadrupole interaction. We find that the separation between the central transition and its satellite, Δf≈20kHz, remains unaffected by magnetic-field variation. Interestingly, the central NMR linewidths vary with the field strength. Above B=3T, the linewidth tends to saturate around 13 kHz. Below B=3T, the linewidth decreases in proportion with field and approaches a lower limit of 1 kHz corresponding to the GaAs nuclear dipole interaction as the field decreases to B=1.25T.
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U2 - 10.1103/PhysRevB.101.035425
DO - 10.1103/PhysRevB.101.035425
M3 - Article
AN - SCOPUS:85078743499
SN - 2469-9950
VL - 101
JO - Physical Review B
JF - Physical Review B
IS - 3
M1 - 035425
ER -