Quantum Phase and its Measurable Attributes a la Aharonov-Bohm Effect
In this article, we discuss how a combination of electrodynamicsand quantum mechanics makes interference measurementsof the quantum phase possible in terms of the vectorpotential, neither of which is detectable independently. Thiseffect, predicted by Aharonov and Bohm, is of great significancein the contemporary interesting topic of nanoscopicphysics. We also indicate how the effect can be incorporatedin a solid state device by employing the tight-binding (TB)model. The TB model can be realized in a mesoscopic ringwhich allows the measurement of the bond current and theassociated diamagnetism. An exactly solvable case of a threesitering is presented that serves as a pedagogic example providingfurther insights into the phenomenon.
Volume 26 | Issue 10