Abstract
We consider the quantum mechanical behavior of a driven particle in an infinite ID potential well. We show that the quantum dynamics of the system is induced by the delicate nontrivial properties of the momentum operator in this case, namely, its non-self-adjointness. Using this, we calculate the first order contribution to the cross section and the energy gain, and discuss their classical limit.
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In fact, as is clearly demonstrated in Ref. 9, during the mathematical procedure of extending the differentiation operator defined on functions that vanish on both sides of the interval, one must release these too restrictive boundary conditions, and consider all periodic functions ψ(0)=ψ(L). This changes the whole physical situation. Thus, in fact, mathematics tells us that if we want to have a self-adjoint momentum operator, we should consider aring and not awell.
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Eisenberg, E., Avigur, R. & Shnerb, N. Quantization process for the driven well—WhereP fails to commute withP 2 . Found Phys 27, 135–151 (1997). https://doi.org/10.1007/BF02550446
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DOI: https://doi.org/10.1007/BF02550446