Ab initio exploration of hydrogen-intercalated transition metal dichalcogenides: From identifying stable structures to emergent superconductivity
We present a first-principles study of hydrogen-intercalated transition metal dichalcogenides (TMDs), examining the structural, thermodynamic, electronic and superconducting properties of distinct intercalation configurations. In most configurations, the two intercalated hydrogen atoms contribute two electrons per unit cell, creating a band gap and thus rendering the system semiconducting. Among the dynamically stable configurations there is one exception to this rule, with inherently metallic behavior. The pristine phases of these materials are known to exhibit a charge density wave instability, which is fully suppressed by specific hydrogen configurations. Moreover, the semiconducting structures can be metallized by hole doping, albeit that the superconducting critical temperatures ($T_c$) are vanishingly low. On the other hand, electron doping drives the $T_c$ up to 25 K, by populating dense states above the gap. This finding can motivate further experimental exploration of superconductivity in hydrogen-intercalated TMDs through ionic-liquid gating or alkali co-intercalation.