While density matrix renormalization group calculations find stripes on doped n-leg t-J ladders, little is known about the possible formation of stripes on n-leg Hubbard ladders. Here we report results for a 7x6 Hubbard model with four holes. We find that a stripe forms for values of U/t ranging from 6 to 20. For U/t approximately 3-4, the system exhibits the domain wall feature of a stripe, but the hole density is very broadened.

arXiv:cond-mat/0306545Physical Review LettersSep 25, 2003114 citations

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DMRG Investigation of Stripe Formation in Doped Hubbard Ladders

Georg Hager, Gerhard Wellein, Eric Jeckelmann, Holger Fehske

Published Nov 17, 2005• 1 citation

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DOI: 10.1007/3-540-26657-7_31

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Stripe Formation and Superfluiditiy Correlation on Two-dimensional Optical Lattice: DMRG Studies for

n

-leg repulsive Hubbard model

We investigate the formation of stripes in $7r\ifmmode\times\else\texttimes\fi{}6$ 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.