CONSISTENT DEFINITION OF THE EFFECTIVE MASS OF THE POLARON
CONSISTENT DEFINITION OF THE EFFECTIVE MASS OF THE POLARON
复制标题
极化子有效质量的一致定义
DOI：
10.1103/physrevb.57.8739
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发表时间：
1998
影响因子：
3.7
通讯作者：
K. Tayanasanti
中科院分区：
文献类型：
--
作者：
V. Sa;K. Tayanasanti
The approximated density matrix of the polaron system obtained in our previous paper for deriving the Feynman effective mass ${m}_{F}$ and the Krivoglaz-Pekar mass ${m}_{\mathrm{KP}}$ is reconsidered. It is shown that to obtain a consistent definition of the polaron effective mass one must impose the condition ${m}_{F}{=m}_{\mathrm{KP}}.$ This consistent definition is based on the fact that the wave functions derived from the density matrix corresponding to each excited state must be normalized and orthogonal. This condition leads to a consistent definition of the effective mass and a different variation principle for treating excited states. Numerical results are presented.
The approximated density matrix of the polaron system obtained in our previous paper for deriving the Feynman effective mass ${m}_{F}$ and the Krivoglaz-Pekar mass ${m}_{\mathrm{KP}}$ is reconsidered. It is shown that to obtain a consistent definition of the polaron effective mass one must impose the condition ${m}_{F}{=m}_{\mathrm{KP}}.$ This consistent definition is based on the fact that the wave functions derived from the density matrix corresponding to each excited state must be normalized and orthogonal. This condition leads to a consistent definition of the effective mass and a different variation principle for treating excited states. Numerical results are presented.