Conjugated Conducting PolymersHelmut G. Kiess, Dionys Baeriswyl |
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Page 79
... limit the exactly half - filled band is described by an isotropic Heisenberg spin Hamiltonian with exchange integral J ~ t2 / U , while away from the half - filled case the Hamiltonian still has an electronic component ~ t . Thus the ...
... limit the exactly half - filled band is described by an isotropic Heisenberg spin Hamiltonian with exchange integral J ~ t2 / U , while away from the half - filled case the Hamiltonian still has an electronic component ~ t . Thus the ...
Page 88
... limit of no e - e interactions but in the presence of a ( Peierls ) gap for the particle - hole excitations , the lowest - lying triplet excitation is a 3B , state which , in the absence of lattice relaxation effects and independent of ...
... limit of no e - e interactions but in the presence of a ( Peierls ) gap for the particle - hole excitations , the lowest - lying triplet excitation is a 3B , state which , in the absence of lattice relaxation effects and independent of ...
Page 96
... limit of zero bond alternation ) the other at U2V1 . On the other hand , in this strong coupling ( undimerized ) limit , the charged even chain ( the correlated analogue of a polaron ) will in fact absorb at the same energy , at zero ...
... limit of zero bond alternation ) the other at U2V1 . On the other hand , in this strong coupling ( undimerized ) limit , the charged even chain ( the correlated analogue of a polaron ) will in fact absorb at the same energy , at zero ...
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A.J. Heeger atoms Baeriswyl band band gap behaviour bipolarons bond alternation bond lengths calculations chain charge carriers charged solitons Chem chemical shift cis-(CH conducting polymers configuration conjugated polymers Coulomb interaction coupling Cryst D.K. Campbell decreases defects dimerization discussed dopant dopant concentration dopant molecules doping doping levels e-e interactions electron correlation electron spin electron-electron interactions electron-phonon ENDOR energy excitations exciton experimental finite polyenes frequency function Hamiltonian Hartree-Fock hopping Hubbard model Hückel inter-chain kink Kivelson lattice Lett linewidth magnetic metallic molecular neutral solitons nonlinear nonlinear optical nuclear observed one-dimensional optical absorption optical gap pair parameter peak Peierls Peierls-Hubbard model phonon Phys polarons polyacetylene polyenes polypyrrole polythiophene properties proton quantum quasi-particles Raman relaxation resonance Sect Solid State Commun spectra spectrum spin density SSH model susceptibility symmetry Synth theoretical theory thermoelectric coefficient trans trans-(CH trans-polyacetylene transition triplet valence bond values Vardeny