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We present a study of the mass-metallicity relation (MZR) of 51 dwarfgalaxies ($M_\star\approx 10^{6.5} - 10^{9.5}~M_\odot$) at $z = 2-3$ from theAbell 2744 and SMACS J0723-3732 galaxy cluster fields. These dwarf galaxies areidentified and confirmed by deep JWST/NIRISS imaging and slitless grismspectroscopic observations. By taking advantage of the superior performance ofJWST and the gravitational lensing effect, we extend the previous MZR relationat $z=2-3$ to a much lower mass regime down by $\approx$ 2.5 orders ofmagnitude as compared with previous studies. We find that the MZR has ashallower slope at the low-mass end ($M_\star<10^{9}~M_\odot$), with a slopeturnover point of $\approx$ $10^9~M_\odot$. This implies that the dominatingfeedback processes in dwarf galaxies may be different from that in massivegalaxies. From $z=3$ to $z=2$, the metallicity of the dwarf galaxies isenhanced by $\approx0.09$ dex for a given stellar mass, consistent with themild evolution found in galaxies with higher mass. Furthermore, we confirm theexistence of a fundamental metallicity relation (FMR) between the gas-phasemetallicity, stellar mass, and star formation rate in dwarf galaxies at$z=2-3$. Our derived FMR, which has no significant redshift evolution, can beused as a benchmark to understand the origin of the anti-correlation betweenthe SFR and metallicity of dwarf galaxies in the high-$z$ Universe.

The Mass-Metallicity Relation of Dwarf Galaxies at Cosmic Noon from JWST Observations