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Phys Rev Lett. 2018 Aug 24;121(8):080402. doi: 10.1103/PhysRevLett.121.080402.

Constraints on a Spin-Dependent Exotic Interaction between Electrons with Single Electron Spin Quantum Sensors.

Rong X1,2,3, Jiao M1,2,3, Geng J1,4, Zhang B1,2,3, Xie T1,2,3, Shi F1,2,3, Duan CK1,2,3, Cai YF5,6, Du J1,2,3.

Author information

1
CAS Key Laboratory of Microscale Magnetic Resonance and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China.
2
Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
3
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.
4
School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei 230009, China.
5
CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei 230026, China.
6
School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China.

Abstract

A new laboratory bound on the axial-vector mediated interaction between electron spins at micrometer scale is established with single nitrogen-vacancy (NV) centers in diamond. A single crystal of p-terphenyl doped pentacene-d_{14} under laser pumping provides the source of polarized electron spins. Based on the measurement of polarization signal via nitrogen-vacancy centers, we set a constraint for the exotic electron-electron coupling g_{A}^{e}g_{A}^{e}, within the force range from 10 to 900  μm. The obtained upper bound of the coupling at 500  μm is |g_{A}^{e}g_{A}^{e}/4πℏc|≤1.8×10^{-19}, which is one order of magnitude more stringent than a previous experiment. Our result shows that the NV center can be a promising platform for searching for new particles predicted by theories beyond the standard model.

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