Extended Gutzwiller wave function for the Hubbard-Holstein model

被引：9
|
作者：
Barone, P.
Raimondi, R.
Capone, M.
Castellani, C.
Fabrizio, M.
机构：
[1] SISSA, I-34014 Trieste, Italy
[2] Univ Roma Tre, Dipartimento Fis E Amaldi, I-00146 Rome, Italy
[3] CNR, Ist Sistemi Complessi, I-00185 Rome, Italy
[4] Univ Roma La Sapienza, INFM, CNR, SMC, I-00185 Rome, Italy
[5] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
[6] Abdus Salam Int Ctr Theoret Phys, I-34014 Trieste, Italy
来源：
EPL | 2007年 / 79卷 / 04期
关键词：
D O I：
10.1209/0295-5075/79/47003
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We introduce a new type of Gutzwiller variational wave function for correlated electrons coupled to phonons, able to treat on equal footing electronic and lattice degrees of freedom. We benchmark the wave function in the infinite-U Hubbard-Holstein model away from half-filling on a Bethe lattice, where we can directly compare with exact results by the Dynamical Mean-Field Theory. For this model, we find that variational results agree perfectly well with the exact ones. In particular the wave function correctly describes the crossover to a heavy polaron gas upon increasing the electron-phonon coupling. Copyright (C) EPLA, 2007.
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页数：5
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