Brane parity orders in the insulating state of Hubbard ladders

Abstract

The Mott insulating state of the Hubbard model at half-filling could be depicted as a spin liquid of singly occupied sites with holon-doublon quantum fluctuations localized in pairs. In one dimension the behavior is captured by a finite value of the charge parity string correlator, which fails to remain finite when generalized to higher dimensions. We recover a definition of parity brane correlator which may remain nonvanishing in presence of interchain coupling, by assigning an appropriate fractional phase to the parity breaking fluctuations. In case of Hubbard ladders at half-filling, we find that the charge parity brane is non-zero at any repulsive value of interaction. The spin parity brane instead becomes nonvanishing in the even-leg case, in correspondence to the onset of the spin gapped D-Mott phase, which is absent in the odd-leg case. The behavior of the parity correlators is also analyzed by means of a numerical DMRG analysis of the one- and two-leg ladder.

Main article: 5 pages, 1 figure. Supplementary information: 4 pages, 8 figures

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• Superconductivity in the Hubbard model: a hidden-order diagnostics from the Luther-Emery phase on ladders
• Non-Local Order Parameters as a Probe for Phase Transitions in the Extended Fermi-Hubbard Model
• Topological phases in two-legged Heisenberg ladders with alternating interactions
• Mott insulator phases of non-locally coupled bosons in bilayer optical superlattices
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• Measuring Non-local Brane Order with Error-corrected Parity Snapshots
• Nonlocal order parameter of pair superfluids
• Fundamental role of nonlocal orders in 1D Extended Bose-Hubbard Model