Electron-phonon interaction close to a Mott transition.
Electron-phonon interaction close to a Mott transition.
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DOI：
10.1103/physrevlett.94.026401
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发表时间：
2004-09
影响因子：
8.6
通讯作者：
G. Sangiovanni;M. Capone;C. Castellani;M. Grilli
中科院分区：
文献类型：
--
作者：
G. Sangiovanni;M. Capone;C. Castellani;M. Grilli
利用动力学平均场理论研究了荷尔斯坦电子-声子相互作用对半填充时接近Mott-Hubbard跃迁的Hubbard模型的影响。我们观察到有效质量的减少，我们用有效斥力的减少来解释。当斥力被重新调整以考虑这种效应时，准粒子的低能特征不受电子-声子相互作用的影响。声子的特征只能在高能的哈伯德带内观察到。准粒子物理中缺少电子-声子指纹可以用罕见的快速过程来解释准粒子运动。
The effect of Holstein electron-phonon interaction on a Hubbard model close to a Mott-Hubbard transition at half filling is investigated by means of dynamical mean-field theory. We observe a reduction of the effective mass that we interpret in terms of a reduced effective repulsion. When the repulsion is rescaled to take into account this effect, the quasiparticle low-energy features are unaffected by the electron-phonon interaction. Phonon features are only observed within the high-energy Hubbard bands. The lack of electron-phonon fingerprints in the quasiparticle physics can be explained interpreting the quasiparticle motion in terms of rare fast processes.