Sommaire:

The nitrogen-vacancy (NV) defect in diamond is a popular system for quantum sensing and imaging, especially for nanoscale magnetometry [1,2]. In this talk, I will present a particular implementation based on ensembles of NV defects in a bulk diamond crystal. I will show that this approach allows wide-field imaging of not only magnetic fields but also electric and strain fields, with access to the full vector/tensor information. I will illustrate these capabilities through three applications: imaging of the current flow in graphene [3]; of surface bend bending in all-diamond devices [4]; and of elastic deformations in carbon microstructures [5]. Finally, I will discuss an anomaly, still unresolved to date, observed in NV magnetometry measurements of the field from current-carrying metallic wires, which seems to suggest that the current density is partly delocalized in the insulating diamond, several microns outside the metal [6].

References
[1] L. Rondin, J.-P. Tetienne, T. Hingant, J.-F. Roch, P. Maletinsky, V. Jacques, “Magnetometry with NV centers in diamond”, Reports on Progress in Physics 77, 056503 (2014).
[2] J.-P. Tetienne, T. Hingant, J.-V. Kim, L. Herrera Diez, J.-P. Adam, K. Garcia, J.-F. Roch, S. Rohart, A. Thiaville, D. Ravelosona, V. Jacques, “Nanoscale imaging and control of domain wall hopping with a nitrogen-vacancy center microscope”, Science 344, 1366 (2014).
[3] J.-P. Tetienne, N. Dontschuk, D. A. Broadway, A. Stacey, D. A. Simpson, L. C. L. Hollenberg, “Quantum imaging of current flow in graphene”, Science Advances 3:e1602429 (2017).
[4] D. A. Broadway, N. Dontschuk, A. Tsai, S. E. Lillie, C. T.-K. Lew, J. C. McCallum, B. C. Johnson, M. W. Doherty, A. Stacey, L. C. L. Hollenberg, J.-P. Tetienne, “Spatial mapping of band bending in semiconductor devices using in situ quantum sensors”, Nature Electronics 1, 502 (2018).
[5] D. A. Broadway, B. C. Johnson, M. S. J. Barson, S. E. Lillie, N. Dontschuk, D. J. McCloskey, A. Tsai, T. Teraji, D. A. Simpson, A. Stacey, J. C. McCallum, J. E. Bradby, M. W. Doherty, L. C. L. Hollenberg, J.-P. Tetienne, “Microscopic imaging of elastic deformation in diamond via in-situ stress tensor sensors”, arXiv:1812.01152 (2018).
[6] J.-P. Tetienne, N. Dontschuk, D. A. Broadway, S. E. Lillie, T. Teraji, D. A. Simpson, A. Stacey, L. C. L. Hollenberg, “Apparent delocalization of the current density in metallic wires observed with diamond nitrogen-vacancy magnetometry”, Physical Review B 99, 014436 (2019).

Pour plus d'informations, merci de contacter Jacques V.