Imaging stress and magnetsm at high pressures using quamtum sensors in a two-dimensional material

Pressure provides a powerful toolbox for altering material properties, leading to the discovery of novel phases and transitions. To investigate two-dimensional (2D) materials under hydrostatic pressure, local sensors near the target materials provide critical insights into their behavior. In this work, we demonstrate the capability to image mechanical stress and magnetism inside a diamond anvil cell, by directly transferring the hexagonal boron nitride flakes containing boron-vacancy (VB) centers. For stress, we find that the susceptibility of VB centers is over three times greater than that of their three-dimensional counterpart --- nitrogen-vacancy centers in diamond, allowing for precise stress measurement. For magnetism, we utilize VB centers to explore the pressure tuning of magnetism in the room temperature 2D magnet, chromium telluride. Our work opens new avenues for probing pressure-dependent phenomena in heterogeneous materials with embedded quantum sensors.