  We present a theoretical investigation on the pressure-induced emergence of
Dirac semimetallic properties in the XCdP (X = Na, K) materials, employing
first-principles calculations. Dirac semimetals, characterized by linear
dispersion relations in their electronic band structures, have gained
prominence due to their unique topological features and potential applications
in electronic devices. Through systematic calculations, we explore the
electronic structure evolution of NaCdP and KCdP under varying pressure
conditions. Our findings reveal a compelling transition to a Dirac semimetallic
state in both NaCdP and KCdP under applied pressure. The electronic band
structures exhibit distinct Dirac cones at the Fermi level, indicating the
presence of massless Dirac fermions. Moreover, the pressure-induced Dirac
semi-metallic phase in these compounds are found to be robust, and are
protected by crystal symmetry. We provide a comprehensive analysis of the
bandgap, Fermi surface, and other relevant electronic properties, offering
insights into the pressure-driven phase transition in NaCdP and KCdP. The
tunability of these materials under external pressure suggests their potential
utility in next-generation electronic devices and quantum technologies.
