Spin and charge modulations in a single-hole-doped Hubbard ladder: Verification with optical lattice experiments
Name
PhysRevA.93.033614.pdf
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450.48 KB
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Author(s)
Zhu, Zheng
Weng, Zheng-Yu
Ho, Tin-Lun
Date Issued
March 2016
Journal
Physical Review A
Publisher
American Physical Society
Citation
Zhu, Zheng, Zheng-Yu Weng, and Tin-Lun Ho. “Spin and Charge Modulations in a Single-Hole-Doped Hubbard Ladder: Verification with Optical Lattice Experiments.” Physical Review A 93, no. 3 (March 7, 2016). © 2016 American Physical Society
Version
Final published version
Abstract
We show that pronounced modulations in spin and charge densities can be induced by the insertion of a single hole in an otherwise half-filled two-leg Hubbard ladder. Accompanied with these modulations is a loosely bound structure of the doped charge with a spin-1/2, in contrast to the tightly bound case where such modulations are absent. These behaviors are caused by the interference of the Berry phases associated with a string of flipped spins (or “phase strings”) left behind as a hole travels through a spin bath with a short-range antiferromagnetic order. The key role of the phase strings is also reflected in how the system responds to increasing spin polarization and the on-site repulsion, addition of a second hole, and increasing asymmetry between intra- and interchain hopping. Remarkably, all these properties persist down to ladders as short as ∼10 sites, as the smoking gun of the phase-string effect. They can therefore be studied in cold-atom experiments using the recently developed fermion microscope.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.93.033614
