抛物量子线中的极化子效应

Polaron Effect in Cylindrical Quantum Wire with Parabolic Potential

在考虑电子与LO声子和电子与SO声子相互作用情况下,采用微扰法研究圆柱形自由抛物量子线中极化子效应.计算量子线中两种声子对极化子自能和电子有效质量的影响.结果表明:随着量子线半径的减小LO声子对极化子自能和电子有效质量的影响相对小些,而SO声子对极化子自能和电子有效质量的影响却显著增加.

The polaron self-energy and correction to the electron effective mass in a freestanding quantum wire with parabolic confining potential was investigated by the perturbation approach. Both the electron-confined longitudinal optical （LO） phonon and surface optical （SO） phonon interactions were considered. Results shows that the contribution of confined LO phonon to the polaron self-energy and the electron effective mass is relatively small as the wire radius decreases. Whereas, the contribution of electron-confined SO phonon to the polamn self-energy and the electron effective mass increases sharply when the radius is thinner and thinner, especially to modification of the electron effective mass.