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Brazilian Journal of Physics

The Double-Slit Electron Diffraction Experiment with Aharonov-Bohm Phase Effect Revisited and the Divergence in its Asymptotic Form

Denise Assafrão, Cássio C. Favarato, S. V. B. Gonçalves, George Simonelli

Published Feb 8, 2019• 1 citation
Publisher
DOI
10.1007/s13538-019-00645-w

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In a "thought experiment," now a classic in physics pedagogy, Feynman visualizes Young's double-slit interference experiment with electrons in magnetic field. He shows that the addition of an Aharonov-Bohm phase is equivalent to shifting the zero-field wave interference pattern by an angle expected from the Lorentz force calculation for classical particles. We have performed this experiment with one slit, instead of two, where ballistic electrons within two-dimensional electron gas diffract through a small orifice formed by a quantum point contact (QPC). As the QPC width is comparable to the electron wavelength, the observed intensity profile is further modulated by the transverse waveguide modes present at the injector QPC. Our experiments open the way to realizing diffraction-based ideas in mesoscopic physics.
Single- and double-slit diffraction patterns are obtained by means of path integrals. The slit function is taken to be unity. This permits the study of the single-slit case as a limit of the double-slit case when the slit width is equal to the slit separation. Introduction of a whisker of flux at the midpoint of the space between slits gives the Aharonov-Bohm shift. In the case of a wide single slit, one obtains conditions approaching those postulated in calculations similar to the scattering calculation of Aharanov and Bohm (1959).