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The nuclear spin singlet order involving coupled pairs of spins-1/2 may beused to store nuclear spin hyperpolarization in a room temperature liquid for atime much longer than the spin-lattice relaxation time $T_1$. There both areobservations of long-lived homonuclear and heteronuclear spin-singlet order.Although hyperpolarized singlet order of the same species are accessible,hyperpolarized heteronuclear spin-singlet order has not been presented yet.Here we show hyperpolarized singlet order is achievable in the sample of$^{13}$C-labeled formic acid solution at room temperature by using opticallypolarized nitrogen vacancy (NV) center spins in nanodiamonds.

Optical hyperpolarization of heteronuclear spin singlet order in liquids