High sensitivity silicon carbide divacancy-based thermometer

TL;DR

This paper demonstrates a high sensitivity silicon carbide divacancy-based thermometer utilizing TCPMG pulses, achieving significantly improved temperature sensing precision suitable for various scientific and industrial applications.

Contribution

It introduces a novel high sensitivity thermometer based on silicon carbide divacancies and TCPMG method, with enhanced coherence times and sensitivity over previous approaches.

Findings

Temperature sensitivity of 13.4 mK/Hz^{1/2} achieved

Coherence time extended to about 21 microseconds

Effective monitoring of laboratory temperature variations

Abstract

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 realize a high sensitivity silicon carbide divacancy-based thermometer using the thermal Carr-Purcell-Meiboom-Gill (TCPMG) method. First, the zero field splitting D of PL6 divacancy as a function of temperature is measured with a linear slope of -99.7 kHz/K. The coherence times of TCPMG pulses linearly increase with the pulse number and the longest coherence time is about 21 us, which is ten times larger than dephasing time. The corresponding temperature sensing sensitivity is 13.4 mK/Hz1/2, which is about 15 times higher than previous results. Finally, we monitor the laboratory temperature variations for 24 hours using the TCMPG pulse. The experiments pave the way for the applications of silicon carbide-based high sensitivity thermometer in the semiconductor industry, biology, and materials sciences.