Functional renormalization group analysis of the half-filled one-dimensional extended Hubbard model

被引:57
|
作者
Tam, KM [1 ]
Tsai, SW [1 ]
Campbell, DK [1 ]
机构
[1] Boston Univ, Dept Phys, Boston, MA 02215 USA
关键词
D O I
10.1103/PhysRevLett.96.036408
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We study the phase diagram of the half-filled one-dimensional extended Hubbard model at weak coupling using a novel functional renormalization group (FRG) approach. The FRG method includes in a systematic manner the effects of the scattering processes involving electrons away from the Fermi points. Our results confirm the existence of a finite region of bond charge density wave, also known as a "bond order wave" near U=2V and clarify why earlier g-ology calculations have not found this phase. We argue that this is an example in which formally irrelevant corrections change the topology of the phase diagram. Whenever marginal terms lead to an accidental symmetry, this generalized FRG method may be crucial to characterize the phase diagram accurately.
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页数:4
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