School of Science Department of Physics 73 Quantum Sensing with NV Center in Diamond for Many Body Physics Supervisor: YANG Sen / PHYS Student: HUNG Ka Ho / PHYS Course: UROP 3100, Fall A cryostat is modified for this experiment so that an ideal condition for investigating the properties of NV (nitrogen-vacancy) can be provided. Defects in diamonds, called NV centers, exhibit remarkable quantum properties and can be used to probe the properties of many-body systems through interactions with the surrounding environment. An ultra-low temperature and pressure are the conditions for precise measurement of NV center properties which can be achieved and controlled by applying a cryostat. Thus, this report aims to introduce the mechanisms of the cryostat, followed by the modification compared to the previous report and the future plan. Quantum Sensing with NV Center in Diamond for Many Body Physics Supervisor: YANG Sen / PHYS Student: LO Lai Fung Louis / PHYS-IRE Course: UROP 1100, Fall The NV (Nitrogen-Vacancy) centre is a well-studied diamond defect whose unique spin properties make it a suitable choice for studying coherence time of magnetic resonance spin. This article will briefly introduce the working principle of the NV centre, mechanism of relaxation time, two types of Hahn echo and their corresponding simulation on coherence time. I will focus on the knowledge on spin coherence time and spin echo, as well as highlighting the simulation performed as an aid to study them. As a series of projects are still in progress, the design and results of specific experiments will be presented in the upcoming semester. Quantum Sensing with NV Center in Diamond for Many Body Physics Supervisor: YANG Sen / PHYS Student: NGUYEN Viet Phong / PHYS Course: UROP 1100, Spring UROP 2100, Summer Nitrogen-vacancy (NV) centers in diamond is a promising quantum sensors for detecting various physical quantities, due to its unique properties of spin-dependent fluorescence and long spin coherence times under ambient conditions. However, it has drawbacks regarding optical properties, they are low fraction of the zero-phonon line (ZPL) against total emission and susceptibility to external electric noise that make optical transitions instable. Group-IV color centers in diamond such as silicon-vancancy (Si-V), germanium-vacancy (Ge-V), and tin-vacancy (Sn-V) centers can solve these problems as they exhibit large ZPLs as well as structural symmetries that are resistant to external noises. This report will discuss the coherence of NV centers and give an overview of group-IV color centers in diamond.
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