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Resistively detected NMR in a triple-gate quantum point contact: Magnetic field dependence

机译:三门量子点接触中的电阻检测NMR:磁场依赖性

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摘要

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 ~(75) As 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. Δ_f ≈ 20 kHz, 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.
机译:我们报告了在量子霍尔击穿机制中基于GaAs的量子点接触中的电阻检测核磁共振(RDNMR)测量。我们专注于在电子占据最低朗道能级的情况下,在不同垂直磁场下检测〜(75)As RDNMR信号。我们确认使用高迁移率(低迁移率)设备成功地将RDNMR检测到低至B = 1.25T(B = 3.5T)。所有的RDNMR信号均表现出归因于电四极相互作用的三重光谱。我们发现中央过渡与它的卫星之间是分开的。 Δ_f≈20 kHz,不受磁场变化的影响。有趣的是,中心NMR线宽随场强而变化。高于B = 3T时,线宽趋于在13 kHz左右饱和。在B = 3T以下,线宽与电场成比例地减小,并且随着电场减小到B = 1.25T,线宽接近1 kHz的下限,与GaAs核偶极相互作用相对应。

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  • 来源
    《Physical review》 |2020年第3期|035425.1-035425.6|共6页
  • 作者单位

    Department of Physics Tohoku University Sendai 980-8579 Japan;

    CSRN Tohoku University Sendai 980-8577 Japan Research Center for Physics Indonesian Institute of Sciences South Tangerang City Banten 15314 Indonesia;

    Department of Physics Tohoku University Sendai 980-8579 Japan CSRN Tohoku University Sendai 980-8577 Japan CSIS (Core Research Cluster) Tohoku University Sendai 980-8577 Japan;

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