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• W2761560602 abstract "The effective Hamiltonian for the linear $Eotimes e$ Jahn-Teller model describes the coupling between two electronic states and two vibrational modes in molecules or bulk crystal impurities. While in the Born-Oppenheimer approximation the Berry curvature has a delta function singularity at the conical intersection of the potential energy surfaces, the exact Berry curvature is a smooth peaked function. Numerical calculations revealed that the characteristic width of the peak is $hbar K^{1/2}/gM^{1/2}$, where $M$ is the mass associated with the relevant nuclear coordinates, $K$ is the effective internuclear spring constant and $g$ is the electronic-vibrational coupling. This result is confirmed here by an asymptotic analysis of the $Mrightarrowinfty$ limit, an interesting outcome of which is the emergence of a separation of length scales. Being based on the exact electron-nuclear factorization, our analysis does not make any reference to adiabatic potential energy surfaces or nonadiabatic couplings. It is also shown that the Ham reduction factors for the model can be derived from the exact geometric phase." @default.
• W2761560602 created "2017-10-20" @default.
• W2761560602 creator A5007292432 @default.
• W2761560602 creator A5040272330 @default.
• W2761560602 creator A5044903168 @default.
• W2761560602 date "2017-12-12" @default.
• W2761560602 modified "2023-09-23" @default.
• W2761560602 title "Asymptotic analysis of the Berry curvature in the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>E</mml:mi><mml:mo>⊗</mml:mo><mml:mi>e</mml:mi></mml:mrow></mml:math>Jahn-Teller model" @default.
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• W2761560602 doi "https://doi.org/10.1103/physreva.96.062503" @default.
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