IMSE Seminar with Chong Zu on Quantum Sensing at High Pressures
The nitrogen-vacancy (NV) center has emerged as a promising nanoscale quantum sensor for temperature, strain, electric and magnetic fields. By integrating NV centers directly into a diamond anvil cell (DAC) --- the workhorse of high pressure science --- we demonstrate the in situ imaging of both strain and magnetism inside the pressure chamber, up to ~50 GPa and for temperatures ranging from 20-340K. In addition to operating the NV in a DC-sensing modality, we also use it to perform temperature dependent magnetic noise spectroscopy of Gadolinium, directly observing the Curie transition via changes in the Johnson noise. In contrast to conventional probes at high pressure, the NV-DAC platform allows for diffractionlimited spatial resolution within the high pressure chamber. Time permitting, I will describe our recent effort on pushing the pressure limit of NV sensor up to megabar (100GPa), making it suitable for diagnosing high pressure and high temperature superconductivity.
Chong Zu received his B.S. in physics and mathematics from Tsinghua University in 2011. After completing his Ph.D. in Prof. Luming Duan’s group at Tsinghua University in 2016, he began postdoctoral work at UC Berkeley in Prof. Norman Yao's group. He joined Washington University as an assistant professor in the summer of 2021.
PS. He is actively looking for enthusiastic students and researchers to join his lab! Please do not hesitate to contact him if you are interested in working together! Email address: Zu@wustl.edu