Robust external spin hyperpolarization of quadrupolar nuclei enabled by strain
Physical Review B(2024)
摘要
In a theoretical study, we investigate the spin dynamics of interacting
nitrogen-vacancy (NV) centers and quadrupolar I = 3/2 nuclear spins,
specifically 11B spins in hexagonal boron nitride (h-BN) nanosheets located
near the microdiamond surface. We demonstrate the possibility of obtaining
external spin-polarization by magnetic-field sweeps across the level
anticrossings around zero-field. To achieve this, we leverage crystal strains
to establish a polarization transfer mechanism that remains robust against
variations in NV orientation, crystal strain inhomogeneity, and
electron-nuclear effective couplings. These results pave the way for
hyperpolarization of spins in nanomaterials near the diamond surface without
experiencing polarization loss to intrinsic nuclear spin-1/2 species, such as
13C and 1H nuclear spins in diamond. The 11B spins in h-BN nanosheets, with
their extended relaxation time and large surface area, present a promising
alternative for relayed nuclear polarization to the liquid phase and for the
development of quantum simulators based on surface nuclear spins.
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