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Revista española de física

Las ondas de materia propuestas por Broglie.

Jesús Unturbe

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

Louis de Broglie put forward the idea of wave-particle duality in 1923-24, less than two years before the advent of Quantum Mechanics. This last theory assumes that duality, but in a more abstract and counter-intuitive manner than de Broglie did. In this article the wave behavior of matter is presented in a didactic way following de Broglie´s ideas. This kind of presentation may (hopefully) be helpful to better understand the quantum features in a more intuitive way. It is shown that this wave mechanics, in the framework of the theory of relativity, is compatible with Planck´s quantum and explains as well the particle´s dynamics, provided the uncertainty relations are properly incorporated. The main difficulty with this view lies in its interpreting the wave as a non-local entity

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Louis de Broglie put forward the idea of wave-particle duality in 1923-24, less than two years before the advent of Quantum Mechanics. This last theory assumes that duality, but in a more abstract and counter-intuitive manner than de Broglie did. In this article the wave behavior of matter is presented in a didactic way following de Broglie´s ideas. This kind of presentation may (hopefully) be helpful to better understand the quantum features in a more intuitive way. It is shown that this wave mechanics, in the framework of the theory of relativity, is compatible with Planck´s quantum and explains as well the particle´s dynamics, provided the uncertainty relations are properly incorporated. The main difficulty with this view lies in its interpreting the wave as a non-local entity
Bohr's response in 1925 to the failure of the Bohr–Kramers–Slater theory was, as we have seen, to regard wave–particle duality as having a formal, rather than realistic, significance; he saw it as a ‘limitation of our usual means of visualization’. That same year, however, wave–particle duality was generalised by Louis-Victor de Broglie to cover the theory of matter. Moreover, the advent of quantum mechanics (i.e. matrix mechanics and wave mechanics), rather than dispelling the duality problem, heightened it. How did Bohr respond to these new developments in the quantum theory? A matter of waves In the autumn of 1923 de Broglie put forward the extremely bold hypothesis that any particle whatever is associated with a wave whose wavelength λ and frequency ν are proportional to the particle's momentum and energy respectively: λ = h / p , v = E / h . De Broglie regarded his hypothesis as the basis of a new mechanics, a wave mechanics related to classical mechanics in the same way as wave optics is related to ray optics. On this view the trajectory of a particle corresponds to the ray of the wave associated with it (i.e. the normal to the equiphase surface of the wave), and the velocity of the particle corresponds to the group velocity of the wave. De Broglie suggested, moreover, that in certain circumstances particles should exhibit diffraction effects: a stream of electrons, for example, which passes through a slit in a screen should undergo diffraction.
In 1923, in three articles published in the Comptes Rendus of the Académie des Sciences , Louis de Broglie proposed the concept of wave–particle duality. Physicists from many countries seized upon this idea. In particular, Schrödinger developed de Broglie's qualitative idea by writing down the equation that the wave must satisfy in the non-relativistic approximation. A relativistic version of this equation was proposed in 1926 by several scientists, and other ones found a solution to the Schrödinger equation as an expansion in powers of the Planck constant.
The development of the quantum theory has been on -going for many years.The wave -particle duality has been and is central to debates among physicists, in their endeavor to understand and bring more insight about the quantum theory.In this paper attempts by physicists to clarify the wave -particle duality are discussed.The wave or particle or both state of matter is analyzed, followed by discussion on the criticisms on de Broglie equation.Lastly, the paper concludes that debates on the wave -particle duality will continue since there is no consensus yet among physicists, and that experimental evidence should be given to substantiate claims.
Louis de Broglie’s doctoral thesis developed a concept of waves associated with material particles that was soon incorporated into wave mechanics and later supported by experimental demonstrations. De Broglie’s original development, however, relied on an incorrect identification of two quite different relations: the relation between the velocity of a particle and the relation between the group velocity of a wave packet and the velocity of individual waves in the packet. A clarification of this difference and its historial significance is followed by a tentative account of the reasons why de Broglie’s well-known formula proved successful, though the theory supporting it rested on a conceptual confusion. Finally, this development and clarification are related to some of the difficulties involved in the attempts top fashion a coherent interpretation of quantum theory.
Wave-particle duality is widely regarded as one of the conceptual pillars of modern quantum theory, providing the framework through which the behavior of microscopic matter can be consistently interpreted. According to this principle, microscopic entities such as electrons, photons, atoms and even complex molecules exhibit both wave-like and particle-like properties depending on the experimental configuration used to observe them. This duality is quantitatively formalized through the De Broglie relation, which associates a wavelength with any particle possessing momentum. The present work provides a comprehensive theoretical analysis of the physical and mathematical foundations of wave-particle duality, focusing particularly on the De Broglie wavelength and the kinetic energy of the electron in both non-relativistic and relativistic regimes. The connection between the De Broglie hypothesis and Schrödinger’s equation is discussed in detail, highlighting the role of the kinetic energy operator and the interpretation of matter waves in terms of quantum wave packets. Experimental evidence supporting the wave nature of matter, including electron diffraction experiments and interferometry techniques, is also reviewed. Beyond their conceptual importance, these principles underpin several modern technologies, including electron microscopy, nanoscale semiconductor devices and quantum metrology. The analysis demonstrates that the De Broglie relation provides a unifying framework connecting momentum, wavelength and kinetic energy, thereby forming a fundamental bridge between classical mechanics, quantum theory and modern technological applications.