Dr Rama Koteswara Rao Kamineni, Associate Professor of Physics, SIAS, Krea University has co-authored a paper titled Vector detection of ac magnetic fields by nitrogen vacancy centers of single orientation in diamond, published in the journal Physical Review B. The paper, selected as an ‘Editor’s Suggestion’, was co-authored with Pooja Lamba (Bennett University), Akshat Rana (Bennett University), Sougata Halder (IIT Jodhpur), Dr Siddharth Dhomkar (IIT Madras) and Professor Dieter Suter (Dortmund University).
About the paper: Nitrogen vacancy (NV) centers in diamond have useful properties for detecting both ac and dc magnetic fields with high sensitivity at nanoscale resolution. The vector detection of ac magnetic fields can be achieved by using NV centers having three different orientations. In this paper, the authors propose a method to achieve this by using NV centers of single orientation. In this method, a static magnetic field is applied perpendicular to the NV axis, leading to strong mixing of the mₛ = −1 and 1 electron spin states. As a result, all three electron spin transitions of the triplet ground state have nonzero dipole moments, with each transition coupling to a single component of the magnetic field. This can be used to measure both the strength and orientation of the applied ac field. To validate the technique, the authors perform a proof-of-principle experiment using a subset of ensemble NV centers in diamond, all having the same orientation. This method is equally applicable to single NV centers.
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