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Focusing on the recently-discovered candidate topological insulator$\alpha$-(BEDT-TSeF)$_2$I$_3$ -- having two-dimensional charge-neutral Diraccones in a low symmetry lattice -- we combine ab-initio and extended-Hubbardmodel calculations to deal with spin-orbit and non-local repulsiveinteractions, and find a realization of an interaction-induced quantum spinHall (QSH) insulator, similar to the one proposed in the honeycomb latticeunder next-nearest neighbor repulsions. In the absence of repulsiveinteractions, a topological insulator appears by the spin-orbit coupling and ischaracterized by a nonzero spin Chern number. By considering up to next-nearestneighbor repulsions at Hartree-Fock level, the intrinsic spin-orbit gap isfound to grow by orders of magnitude and a QSH insulating phase appears thathas both a finite spin Chern number and order parameter. Transport coefficientsand spin susceptibility are calculated and found to consistently account formost of the experimental findings, including the metal-to-insulator crossoveroccurring at $\sim50$ K as well as the Berry phase change from 0 to $\pi$ underhydrostatic pressure. We argue that such a QSH insulating phase does notnecessitate a sizeable spin-orbit interaction to generate a large insulatinggap, which is highly advantageous for the search of novel topological phases ingeneric materials having low symmetry lattice and/or small spin-orbit coupling.

Interaction-induced quantum spin Hall insulator in the organic Dirac electron system $\alpha$-(BEDT-TSeF)$_2$I$_3$