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Published online by Cambridge University Press: 20 November 2018
In this paper we give a characterization of a real hypersurface of Type $\left( A \right)$ in complex two-plane Grassmannians
${{G}_{2}}\left( {{\mathbb{C}}^{m+2}} \right)$, which means a tube over a totally geodesic
${{G}_{2}}\left( {{\mathbb{C}}^{m+1}} \right)$ in
${{G}_{2}}\left( {{\mathbb{C}}^{m+2}} \right)$, by means of the Reeb parallel structure Jacobi operator
${{\nabla }_{\xi }}{{R}_{\xi }}\,=\,0$.