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- W2016043162 abstract "Abstract The ARPES of high- T c cuprates and theoretical results of low-Fermi energy band structure fluctuation for different groups of superconductors indicate that electron coupling to pertinent phonon modes drive system from adiabatic into anti-adiabatic state ( ω > E F ). At these circumstances, not only Migdal–Eliashberg approximation is not valid, but basic adiabatic Born–Oppenheimer approximation (BOA) does not hold. At these circumstances, electronic structure has to be studied as explicitly dependent on instantaneous nuclear coordinates Q as well as on instantaneous nuclear momenta P . In the present paper—part I, it has been shown that Q , P -dependent modification of the BOA for ground electronic state can be derived by sequence of canonical transformations of the basis functions. The effect of nuclear coordinates and momenta on electronic structure is presented in the form of corrections to zero-, one- and two-particle terms of clamped nuclear Hamiltonian. In the anti-adiabatic state, correction to electronic ground state energy (zero-particle term correction) is negative and system can be stabilized in the anti-adiabatic state at distorted geometry with respect to adiabatic equilibrium structure and gap in one-particle spectrum of quasi-continuum states at Fermi level can be opened. Stabilization effect is solely the consequence of nuclear dynamics ( P ) that is crucial in anti-adiabatic state. It has been shown that nuclear dynamics also increases electron correlation until system at nuclear motion remains in a bound state. Corresponding corrections to electronic wave function are also specified. On the other hand, when system remains at vibration motion of nuclei in adiabatic state, the influence of nuclear dynamics ( P -dependence) is negligible. In this case, all basic effects are covered through nuclear coordinates ( Q -dependence) within the adiabatic BOA and standard results of solid-state (or molecular) physics are recovered." @default.
- W2016043162 created "2016-06-24" @default.
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- W2016043162 date "2008-11-01" @default.
- W2016043162 modified "2023-10-16" @default.
- W2016043162 title "Ab initio theory of complex electronic ground state of superconductors: I. Nonadiabatic modification of the Born–Oppenheimer approximation" @default.
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- W2016043162 doi "https://doi.org/10.1016/j.jpcs.2008.07.002" @default.
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