Theoretical Aspects of Conducting Polymers: Electronic Structure and Defect States |
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Page 25
... . Consider a vibration where neighbouring atoms move in ( -1 ) du . opposite direction , Sun This is a simple = n bond - stretching mode and thus the associated potential energy can easily be calculated from Eq . ( 23 25.
... . Consider a vibration where neighbouring atoms move in ( -1 ) du . opposite direction , Sun This is a simple = n bond - stretching mode and thus the associated potential energy can easily be calculated from Eq . ( 23 25.
Page 27
... neighbouring points . We have seen that the Peierls mechanism leads to a gap at the Fermi level . For weak coupling , i.e. λ << 1 , only states close to ± k are affected , namely within a region | ħvk | ≤ 4 。 where hvF = = 2ta . This ...
... neighbouring points . We have seen that the Peierls mechanism leads to a gap at the Fermi level . For weak coupling , i.e. λ << 1 , only states close to ± k are affected , namely within a region | ħvk | ≤ 4 。 where hvF = = 2ta . This ...
Page 82
... neighbouring chains , the energy differense parallel and antiparallel alignment being of the order of 1 K per site . This type of ordering appears to have been found experimentally ( Fincher et al . 1982 ) . SE between It is obvious ...
... neighbouring chains , the energy differense parallel and antiparallel alignment being of the order of 1 K per site . This type of ordering appears to have been found experimentally ( Fincher et al . 1982 ) . SE between It is obvious ...
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