Hamiltonian Su-Schrieffer-Heeger

The first two terms in equation (1.6) are the kinetic and the elastic energy of tiie system, the third is the electron hopping term, and the fourth corresponds to the correlation energy. If C/=0, equation (1.6) reduces to the Su-Schrieffer-Heeger Hamiltonian with a Peierls gap of... 

Surface coatings of polyaniline for protection against corrosion, 564-565 Su-Schrieffer-Heeger Hamiltonian, 23 Suzuid reaction, 293 Synthesis, 2, 405. 507, 724 lesser-known methods, 514 methods of, 575... 

In the one-dimensional limit, the coupling to acoustic phonons is at the heart of the Su-Schrieffer-Heeger (SSH) Hamiltonian [21] ... 

The Su Schrieffer Heeger (11) Hamiltonian for one extra electron added to an insulator is... 

In a TT-electron theory the ion represents the CH group, so there are three ionic degrees of freedom per unit cell. These ionic degrees of freedom may be formally represented as collective, normal modes. Su, Schrieffer, and Heeger, in their treatment of frans-polyacetylene, introduced a simplification to this problem (Su et al. 1970). This simplification was to consider only the normal mode that predominantly couples to the tr-electrons. For polyacetylene this is the carbon bond stretching vibration. Thus, projecting the ionic coordinates onto the chain axis, denoted by the x-axis, we have the Su-Schrieffer-Heeger (SSH) Hamiltonian, defined as,... 

Initial experimental studies [32] [using UV-Vis-NIR and electron spin resonance (ESR) techniques] of highly doped polythiophene showed the bipolaron structure to be dominant. Later, this finding was supported by theoretical studies [33]. However, the majority of the early theoretical studies used the Su-Schrieffer-Heeger (SSH) Pariser-Parr-Pople (PPP) model Hamiltonians and or low-level ab initio calculations such as HF/STO-3G. Semiempirical calculations predicted that two polarons on the oligothio-phene chain would be more stable than a bipolaron for oligomers longer than the dodecamer [34], and many... 

In a seminal paper [4], Su, Schrieffer, and Heeger discussed the energetics of solitons using a simple model of free electrons interacting with the lattice described by the Hamiltonian ... 

To test this hypothesis one can start by writing down a Hamiltonian for the soliton. Generalizing the theory of Su, Schrieffer, and Heeger... 

For polyacetylene, many authors apply the so-called SSH Hamiltonian introduced by Su, Schrieffer, and Heeger (1980), which is an alternative to the Longuet-Higgins model. The difference is only in the handling of the a core potential function f and in the parametrization of the model. 

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