Development of an ESR/NMR Double-Magnetic-Resonance System for Use at Ultra-low Temperatures and in High Magnetic Fields and Its Use for Measurements of a Si Wafer Lightly Doped with 31P
Development of an ESR/NMR Double-Magnetic-Resonance System for Use at Ultra-low Temperatures and in High Magnetic Fields and Its Use for Measurements of a Si Wafer Lightly Doped with 31P
复制标题
超低温高磁场ESR/NMR双磁共振系统的开发及其在轻掺杂31P硅片测量中的应用
DOI：
10.1007/s00723-021-01309-2
复制
发表时间：
2021
影响因子：
1
通讯作者：
Vasiliev Sergey
中科院分区：
文献类型：
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作者：
Ishikawa Yuya;Fujii Yutaka;Fukuda Akira;Koizumi Yuta;Omija Tsunehiro;Oida Tomoki;Yamamori Hidetomo;Matsubara Akira;Mitsudo Seitaro;Lee Soonchil;J¨arvinen Jarno;Vasiliev Sergey
动态核极化-核磁共振（DNP-NMR）和电子-核双共振（ENDOR）提供了有关稀自旋体系磁性的有用信息。其中一种系统是掺有31p （Si:P）的硅晶片，它是量子计算设备的候选材料。“Si:P”模型由Kane于1998年提出。然而，到目前为止，31p的核磁的细节，这是使用这些原子核作为计算量子比特的重要信息，仍然未知。原因是自旋被稀释了，而且从直接的核磁共振检测中没有关于Si中31p的报道。因此有必要克服稀释，以显示Si:P的有用性。DNP-NMR方法利用奥弗豪瑟效应控制相对磁化强度，提高了核磁共振对31p的灵敏度。我们开发了用于超低温和高磁场的磁共振设备，目标是在核磁共振测量中使用DNP直接检测31p。利用该系统在139.03 MHz， 220 mK下进行了31p - dnp - nmr实验。根据样品的大小和浓度，我们成功地检测到约1.9 × 1014个完全极化的31p核自旋的自旋回波核磁共振信号。在本文中，我们描述了在3he - 4he稀释制冷机中构建的一种新的电子自旋共振(ESR)/核磁共振双磁共振系统，并演示了它在硅晶片中获得31p的ENDOR和DNP-NMR测量。
Dynamic nuclear polarization–nuclear magnetic resonance (DNP–NMR) and electron–nuclear double resonance (ENDOR) provide useful information about the magnetic properties of dilute spin systems. One such system is a Si wafer lightly doped with31P (Si:P) which is a candidate for quantum-computing devices. The “Si:P” model was proposed by Kane in 1998. To date, however, the details of the nuclear magnetism of31P, which is important information for the use of these nuclei as quantum bits for computing, are still unknown. The reason is because the spins are diluted, and there has been no report about31P in Si from direct NMR detection. It is thus necessary to overcome the dilution to show the usefulness of Si:P. The DNP–NMR method provides a way to improve the NMR sensitivity to31P by controlling the relative magnetization with the Overhauser effect. We have developed magnetic-resonance equipment for ultra-low temperatures and high magnetic fields with the goal of using DNP to detect31P directly in NMR measurements. We have carried out31P-DNP–NMR at 139.03 MHz, 220 mK using this system. We have successfully detected by one-shot measurement the spin-echo NMR signal of approximately 1.9 × 1014fully polarized31P nuclear spins which is estimated from the size and the concentration of the sample. In this report, we describe a new electron spin resonance (ESR)/NMR double-magnetic-resonance system constructed in a3He–4He dilution refrigerator, and demonstrate its use to obtain ENDOR and DNP–NMR measurements of31P in a Si wafer.