Theoretical Aspects of Conducting Polymers: Electronic Structure and Defect States |
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Page 13
... bond - bond polarizability leads to a diverging negative contribution to the dynamical matrix in the case of equal bond lengths and for an infinitely long chain . This is the origin of the instability with respect to bond alternation ...
... bond - bond polarizability leads to a diverging negative contribution to the dynamical matrix in the case of equal bond lengths and for an infinitely long chain . This is the origin of the instability with respect to bond alternation ...
Page 17
... bond alternation in polyacetylene The question of bond alternation in polymeric chains has been studied theoretically already by Lennard - Jones ( 1937 ) and Coulson ( 1938 ) and advanced as a hypothesis for explaining optical spectra ...
... bond alternation in polyacetylene The question of bond alternation in polymeric chains has been studied theoretically already by Lennard - Jones ( 1937 ) and Coulson ( 1938 ) and advanced as a hypothesis for explaining optical spectra ...
Page 41
... bond alternation is an even function of the distortion parameter y ( cf. Eq . ( 23 ) ) . Therefore there are two degenerate minima which correspond to the two possible bond alternation sequences : The even- numbered bonds are either ...
... bond alternation is an even function of the distortion parameter y ( cf. Eq . ( 23 ) ) . Therefore there are two degenerate minima which correspond to the two possible bond alternation sequences : The even- numbered bonds are either ...
Common terms and phrases
A.J. Heeger absorption amplitude approximation associated assume Baeriswyl band becomes Bishop bond alternation bond length bond order boundary calculations Campbell chain changes charge conducting configuration consider constant continuum limit correlation corresponds coupling defect density depend described determined dimerization discrete discuss disorder distortion dynamical effects electronic energy equation et al expected experiments extent field fluctuations force function given gives ground Hamiltonian hand Hückel impurity increasing integral interaction interchain coupling involved kink lattice leads Lett levels limit MacDiarmid Mele modes Notice observed obtained optical parameter particular Peierls phase phonon Phys Physics points polaron polyacetylene polymers potential presented produced properties proposed represents respect Rice Schrieffer self-consistency shown single Solid soliton solution strongly structure temperature theory whereas yields