期刊
PHYSICAL REVIEW B
卷 104, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.L140307
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This study compares polarons in the one-dimensional Bond-Peierls model and the breathing-mode Peierls problem, showing that polaron mass enhancement depends on the momentum dependence of phonons. The inclusion of phonon dispersion leads to a nondivergent polaron mass, with a possible transition to a non-zero-momentum ground state similar to the breathing-mode Peierls model.
We study polarons in the one-dimensional Bond-Peierls electron-phonon model in which phonons on bonds of a lattice modulate the hopping of electrons between lattice sites and contrast the results to those known for the breathing-mode Peierls problem. By inspecting the atomic limit, we show that polaronic dressing and mass enhancement of Bond-Peierls polarons depend on the momentum dependence of the phonons. For dispersionless phonons, Bond-Peierls polarons are perfectly localized in the atomic limit, unlike their breathing-mode counterparts because the carrier creates a string of phonon excitations that can only be annihilated via processes that retrace the carrier to its original site. However, inclusion of phonon dispersion leads to a nondivergent polaron mass even in the atomic limit and depending on the form of the phonon dispersion may lead to a transition to a non-zero-momentum ground state akin to that found in the breathing-mode Peierls model.
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