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Phase transition-induced contact electric potential

ABSTRACT Inhomogeneous phase transitions are widespread phenomena in nature. However, a complete understanding of these phase transitions is still challenging. Here a contact electric potential arising from alterations of Fermi surface energy (electron chemical potential) was revealed theoretically when phase transitions happen, and it is named after Haiyan Zang potential. It can induce a strong intrinsic electric field at interfaces. And the related electric energy may reduce interfacial energy of nucleated nano-nucleuses during phase transitions so that they could stably exist and grow rapidly, thereby modifying the classical nucleation theory. Further, in terms of Haiyan Zang potential, a threshold grain growth rate for the nano-nucleuses during phase transition was revealed to depend on the electrical conductivity of interfaces. Overall, these findings that Haiyan Zang potential and the related intrinsic electric field at interface may offer people new fundamental knowledge on various phase transitions and phase transition dynamics.