College of Physics, Sichuan University, Chengdu 610065, People's Republic of China.
Nanoscale. 2023 May 11;15(18):8432-8436. doi: 10.1039/d3nr00430a.
Color centers in silicon carbide have become potentially versatile quantum sensors. Particularly, wide temperature-range temperature sensing has been realized in recent years. However, the sensitivity is limited due to the short dephasing time of the color centers. In this work, we developed a high-sensitivity silicon carbide divacancy-based thermometer using the thermal Carr-Purcell-Meiboom-Gill (TCPMG) method. First, the zero-field splitting of the PL6 divacancy as a function of temperature was measured with a linear slope of -99.7 kHz K. The coherence times of TCPMG pulses linearly increased with the pulse number and the longest coherence time was about 21 μs, which was ten times higher than . The corresponding temperature-sensing sensitivity was 13.4 mK Hz, which was about 15 times higher than previous results. Finally, we monitored the laboratory temperature variations for 24 hours using the TCMPG pulse. The experiments pave the way for the application of silicon carbide-based high-sensitivity thermometers in the semiconductor industry, biology, and materials sciences.
碳化硅中的色心已成为潜在的多功能量子传感器。特别是，近年来已经实现了宽温度范围的温度传感。然而，由于色心的退相时间短，灵敏度受到限制。在这项工作中，我们使用热 Carr-Purcell-Meiboom-Gill (TCPMG) 方法开发了一种基于碳化硅双空位的高灵敏度温度计。首先，我们测量了 PL6 双空位的零场分裂作为温度的函数，其线性斜率为-99.7 kHz K。TCPMG 脉冲的相干时间随脉冲数线性增加，最长相干时间约为 21 μs，比以前的结果高十倍。相应的温度传感灵敏度为 13.4 mK Hz，比以前的结果高 15 倍左右。最后，我们使用 TCMPG 脉冲监测了实验室温度变化 24 小时。这些实验为碳化硅基高灵敏度温度计在半导体工业、生物学和材料科学中的应用铺平了道路。
