Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-10-26
Phys. Rev. B 71, 165324 (2005)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, 7 figures, final version accepted by PRB
Scientific paper
10.1103/PhysRevB.71.165324
On the basis of the nonequilibrium Green's function and nonperturbative canonical transformation for the local electron-phonon interaction (EPI), the quantum transport through a single-molecule transistor(SMT) has been investigated with a particular attention paid to the joint effect of the EPI and SMT-lead coupling on the spectral function and conductance. In addition to the usual EPI-induced renormalized effects (such as the red-shift, sharpening, and phonon-sidebands of the SMT level), owing to improved disentagling the electron-phonon system, it has been found that, the profile of the spectral function of the SMT electron is sensitive to lead chemical potentials, thus can readily be manipulated by tuning the bias as well as the SMT-gate voltage. As a consequence, the broken particle-hole symmetry in this system can be clearly recognized through the phonon sidebands in the spectral function. These EPI effects also manifest themselves in the nonequilibrium transport properties of the SMT, particularly at low temperature.
Chen Zuo-zi
Lu Rong
Zhu Bang-fen
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