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Floquet–Green function formalism for harmonically driven Hamiltonians

D F Martinez

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A method is proposed for the calculation of the Floquet–Green function of a general Hamiltonian with harmonic time dependence. We use matrix continued fractions to derive an expression for the 'dynamical effective potential' that can be used to calculate the Floquet–Green function of the system. We demonstrate the formalism for the simple case of a space-periodic (in the tight-binding approximation) Hamiltonian with a defect whose on-site energy changes harmonically with time. We study the local density of states for this system and the behaviour of the localized states as a function of the different parameters that characterize the system.


PACS

02.30.Em Potential theory

73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems

63.20.K- Phonon interactions

MSC

34B27 Green functions

82D25 Crystals (For crystallographic group theory, see 20H15)

70S05 Lagrangian formalism and Hamiltonian formalism

Subjects

Mathematical physics

Surfaces, interfaces and thin films

Condensed matter: structural, mechanical & thermal

Dates

Issue 38 (26 September 2003)

Received 2 July 2003, in final form 31 July 2003

Published 10 September 2003



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