Abstract
The effect of quantum phonons on the Peierls transition temperature in a one-dimensional commensurate system is studied. The nonadiabatic effect due to finite phonon frequency ωp>0 are treated through an energy-dependent electron-phonon scattering function δ(k′, k). By using the Green's-function perturbation theory we have shown that our theory gives a good description of the effect of quantum phonons: (i) There exists a critical electron-phonon coupling gc2. The Peierls transition temperature Tp=0 when the coupling g2<gc2 and Tp increases with increasing g2>gc2. (ii) The ratio 2Δ/Tp could be much larger than the BCS value 3.527.
Original language | English |
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Article number | 014304 |
Pages (from-to) | 143041-143048 |
Number of pages | 8 |
Journal | Physical Review B |
Volume | 65 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Jan 2002 |