De Broglie is mainly engaged in theoretical physics, especially the study of quantum problems. His main research achievements in this field have made outstanding contributions to the development of modern physics. 10, de Broglie expounded the famous theory of matter wave in his doctoral thesis and pointed out the fluctuation of electrons. This theory laid a solid foundation for the establishment of wave mechanics. Thanks to this epoch-making research achievement,

From September of 1923 to September of 10/0, De Broglie published three papers in Bulletin of French Academy of Sciences: radiation-wave and quantum, optical-optical quantum, diffraction and interference, physical-quantum, gas motion theory and Fermat principle. In these essays, a viewpoint called "De Broglie Wave" is put forward. 1824, in his doctoral thesis entitled "Research on Quantum Theory", he systematically expounded the theory of phase fluctuation put forward in his previous article, and passed the defense of his doctoral thesis under the auspices of Perrin on127 of the same year.