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While various excitonic insulators have been studied in the literature, dueto the perceived too-small spin splitting, spin-triplet excitonic insulator israre. In two-dimensional systems such as a graphone, however, it is possible,as revealed by first-principles calculations coupled with Bethe-Salpeterequation. The critical temperature, given by an effective Hamiltonian, is 11.5K. While detecting excitonic insulators is still a daunting challenge, thecondensation of triplet excitons will result in spin superfluidity, which canbe directly measured by a transport experiment. Nonlocal dielectric screeningalso leads to an unexpected phenomenon, namely, an indirect-to-directtransition crossover between single-particle band and exciton dispersion ingraphone, which offers yet another test by experiment.

Spin-Triplet Excitonic Insulator: The Case of Graphone