  We study the physics of the strong-coupling Hubbard model in a kagome lattice
ribbon under mechanical tension and half-filling. It is known that in the
absence of strain, the lattice symmetry of the system and strong electronic
interactions induce magnetic frustration. As uniaxial strain is applied, the
ribbon exhibits various configurations with energy oscillations that depend on
the direction of the strain axis. The ground states are obtained by density
matrix enormalization group calculations. We find that the system is
characterized by strong antiferromagnetic bonds distributed throughout the
lattice along directions and patterns that depend on the strain directions and
may coexist with easily polarizable sites that are only weakly correlated to
their neighbors. We identify frustration and correlation measures that follow
the strain and interaction dependence of the system well. These results
illustrate that strain-dependent magnetic susceptibility could be explored
experimentally to help probe the role of symmetry and interactions in these
systems.
