Theoretical Aspects of Conducting Polymers: Electronic Structure and Defect States |
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Page 22
... weak couplings ( Schulz 1978 , Mele and Rice 1980a ) show furthermore , that the dynamical matrix has no negative ... coupling limit . One of the key questions concerning polyacetylene is if the Peierls instability is indeed the dominant ...
... weak couplings ( Schulz 1978 , Mele and Rice 1980a ) show furthermore , that the dynamical matrix has no negative ... coupling limit . One of the key questions concerning polyacetylene is if the Peierls instability is indeed the dominant ...
Page 26
... weak - coupling limit ( λ << 1 ) one obtains a mode frequency = 21 w2 2 where ய = 4K / M corresponds to the bare frequency of the undistorted system . The explicit numerical calculations involving all in - plane vibra- tional modes ...
... weak - coupling limit ( λ << 1 ) one obtains a mode frequency = 21 w2 2 where ய = 4K / M corresponds to the bare frequency of the undistorted system . The explicit numerical calculations involving all in - plane vibra- tional modes ...
Page 71
... weak - coupling limit , U , < t to vs to , and therefore use the transformation to continuum fields , Eq . ( 31 ) . Keeping only the relevant terms ( those involving both kp and -kp ) we find ( 81 ) Hint = + [ fax ( 911s 2s 1s 2s - 71 -
... weak - coupling limit , U , < t to vs to , and therefore use the transformation to continuum fields , Eq . ( 31 ) . Keeping only the relevant terms ( those involving both kp and -kp ) we find ( 81 ) Hint = + [ fax ( 911s 2s 1s 2s - 71 -
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