Theoretical Aspects of Conducting Polymers: Electronic Structure and Defect States |
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Page 21
... represents a variational state and not necessarily a true minimum of the energy . But , as we will see now , and as has been pointed out by Shastry ( 1983 ) , this state represents indeed a solution of Eq . ( 12 ) and thus an extremum ...
... represents a variational state and not necessarily a true minimum of the energy . But , as we will see now , and as has been pointed out by Shastry ( 1983 ) , this state represents indeed a solution of Eq . ( 12 ) and thus an extremum ...
Page 22
... represents an extremum of the energy . Numerical calculations for weak couplings ( Schulz 1978 , Mele and Rice 1980a ) show furthermore , that the dynamical matrix has no negative eigenvalues in the dimerized state , which is thus a ...
... represents an extremum of the energy . Numerical calculations for weak couplings ( Schulz 1978 , Mele and Rice 1980a ) show furthermore , that the dynamical matrix has no negative eigenvalues in the dimerized state , which is thus a ...
Page 51
... represents a large amplitude defect which satisfies the boundary condition △ ( L / 2 ) = − △ ( -L / 2 ) . It is natural to look for similar large amplitude defects where the order parameter does not change sign . Such states do ...
... represents a large amplitude defect which satisfies the boundary condition △ ( L / 2 ) = − △ ( -L / 2 ) . It is natural to look for similar large amplitude defects where the order parameter does not change sign . Such states do ...
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