Stripe formation in doped Hubbard ladders

被引:68
作者
Hager, G
Wellein, G
Jeckelmann, E
Fehske, H
机构
[1] Reg Rechenzentrum Erlangen, D-91058 Erlangen, Germany
[2] Univ Mainz, Inst Phys, D-55099 Mainz, Germany
[3] Univ Greifswald, Inst Phys, D-17489 Greifswald, Germany
来源
PHYSICAL REVIEW B | 2005年 / 71卷 / 07期
关键词
D O I
10.1103/PhysRevB.71.075108
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We investigate the formation of stripes in 7r x 6 Hubbard ladders with 4r holes doped away from half filling using the density-matrix renormalization group (DMRG) method. A parallelized code allows us to keep enough density-matrix eigenstates (up to m=8000) and to study sufficiently large systems (with up to 7r=21 rungs) to extrapolate the stripe amplitude to the limits of vanishing DMRG truncation error and infinitely long ladders. Our work gives strong evidence that stripes exist in the ground state for strong coupling (U=12t) but that the structures found in the hole density at weaker coupling (U=3t) are an artifact of the DMRG approach.
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页数:6
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