Lecturer: Vladimir Dyakonov, Institute of Physics and Würzburg-Dresden Cluster of Excellence ct.qmat, Julius Maximilian, University of Würzburg, 97074 Würzburg, Germany.

Abstract:
Van der Waals (vdW) materials have emerged over the last decade as the new playground
for quantum photonics devices. Among them, hexagonal boron nitride (hBN) is an
interesting candidate, mainly because of its crystallographic compatibility with many
different 2D materials, but also because of its ability to host optically active spin defects. We
have recently reported [1] the optically detected magnetic resonance of spin-triplet
negatively charged boron vacancies (V B – ) in hBN and determined their spin-Hamiltonian
parameters. Furthermore, we demonstrated the coherent control of V B – at room
temperature and determined the relevant spin-coherence times. [2]
In this respect, sensors based on such color centers embedded in an intercalated hBN layer
within a vdW heterostructure may be particularly attractive, since the distance between the
sensor and the object to be sensed can be quite small. The influence of external stimuli
(magnetic field, temperature, pressure, etc.) on this spin defect will be also discussed. [3]
[1] A. Gottscholl, M. Kianinia, V. Soltamov, C. Bradac, C. Kasper, K. Krambrock, A. Sperlich, M.
Toth, I. Aharonovich, and V. Dyakonov, Nat. Mater. 19, 540 (2020)
[2] A. Gottscholl, M. Diez, V. Soltamov, C. Kasper, A. Sperlich, M- Kianinia, C. Bradac, I.
Aharonovich and V. Dyakonov, Science Adv., 7, eabf3630 (2021)
[3] A. Gottscholl, M. Diez, V. Soltamov, C. Kasper, D. Krauße, A. Sperlich, M. Kianinia, C.
Bradac, I. Aharonovich, and V. Dyakonov, Nat. Commun. 12, 4480 (2021)