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The nature of dark matter remains obscure in spite of decades of experimentalefforts. The mass of dark matter candidates can span a wide range, and itscoupling with the Standard Model sector remains uncertain. All these unknownsmake the etection of dark matter extremely challenging. Ultralight dark matter,with $m \sim10^{-22}$ eV, is proposed to reconcile the disagreements betweenobservations and predictions from simulations of small-scale structures in thecold dark matter paradigm, while remaining consistent with other observations.Because of its large de Broglie wavelength and large local occupation numberwithin galaxies, ultralight dark matter behaves like a coherently oscillatingbackground field with an oscillating frequency dependent on its mass. If thedark matter particle is a spin-1 dark photon, such as the $U(1)_B$ or$U(1)_{B-L}$ gauge boson, it can induce an external oscillating force and leadto displacements of test masses. Such an effect would be observable in the formof periodic variations in the arrival times of radio pulses from highly stablemillisecond pulsars. In this study, we search for evidence of ultralight darkphoton dark matter (DPDM) using 14-year high-precision observations of 26pulsars collected with the Parkes Pulsar Timing Array. While no statisticallysignificant signal is found, we place constraints on coupling constants for the$U(1)_B$ and $U(1)_{B-L}$ DPDM. Compared with other experiments, the limits onthe dimensionless coupling constant $\epsilon$ achieved in our study areimproved by up to two orders of magnitude when the dark photon mass is smallerthan $3\times10^{-22}$~eV ($10^{-22}$~eV) for the $U(1)_{B}$ ($U(1)_{B-L}$)scenario.

High-precision search for dark photon dark matter with the Parkes Pulsar Timing Array