The adiabatic‐to‐diabatic transformation angle and topological phases for strongly interacting states: Solution with four states |
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Authors: | Anita Das Debasis Mukhopadhyay |
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Institution: | Department of Chemistry, University of Calcutta, Kolkata 700009, India |
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Abstract: | A few years back T. Vértesi et al. (J Phys Chem A 2005, 109, 3476) gave an elegant procedure to derive the adiabatic‐to‐diabatic transformation angle (ADT‐angle) for lowest two states, γ12, in presence of their interaction with the higher states. In this article, we explicitly solved the coupled differential equations involving the ADT‐angles describing the mixing of four interacting states for the first time to get all the ADT‐angles, γij's (including the γ12) associated with well‐defined topological phases. In application to a suitable configuration space (CS) of a molecular system, we have demonstrated well‐defined Berry phases (Berry M. V., R Soc London Ser A 1984, 45, 392) for an isolated system with as many as four strongly interacting states. © 2012 Wiley Periodicals, Inc. |
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Keywords: | Berry phase Hilbert sub space Adiabatic‐to‐diabatic transformation angle four‐state model |
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