Louis Victor Pierre Raymond de Broglie, 7th duc de Broglie (, also US: , French: [d? b??j] or [d? b?œj] (listen); 15 August 1892 – 19 March 1987) was a French physicist who made groundbreaking contributions to quantum theory.
In his 1924 PhD thesis, he postulated the wave nature of electrons and suggested that all matter has wave properties.
This concept is known as the de Broglie hypothesis, an example of wave–particle duality, and forms a central part of the theory of quantum mechanics.
De Broglie won the Nobel Prize for Physics in 1929, after the wave-like behaviour of matter was first experimentally demonstrated in 1927.
The 1925 pilot-wave model, and the wave-like behaviour of particles discovered by de Broglie was used by Erwin Schrödinger in his formulation of wave mechanics.
De Broglie became the first high-level scientist to call for establishment of a multi-national laboratory, a proposal that led to the establishment of the European Organization for Nuclear Research (CERN).