Interplay Between Electron-Phonon Interaction And Hubbard Repulsion: Bipolaron Formation

被引：0
|
作者：
Nath, S. [1 ]
Mondal, N. S. [1 ]
Ghosh, N. K. [1 ]
机构：
[1] Univ Kalyani, Dept Phys, Kalyani 741235, W Bengal, India
来源：
PROCEEDINGS OF THE 59TH DAE SOLID STATE PHYSICS SYMPOSIUM 2014 (SOLID STATE PHYSICS) | 2015年 / 1665卷
关键词：
Electronic structures; phonons; bipolarons; T-J MODEL; SUPERCONDUCTING PHASE;
D O I：
10.1063/1.4918002
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
In the weak coupling limit, the 2D Hubbard model extended by on-site (local) and inter-site (long range) electron-phonon (EP) interaction has been investigated within Lanczos method of exact diagonalization (ED). On-site (S0) bipolaron formation has been favored by on-site EP interaction induced effective attraction between electrons. But, inter-site phonon mediated interaction between electrons helps to form both S0 and neighboring site (S1) bipolaron. It is further observed that both types of bipolaron formation are suppressed by on-site Hubbard repulsion.
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页数：3
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