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High temperature superconductivity in one unit cell (1 UC) FeSe on SrTiO3heterostructure has become a research frontier in condensed matter physics andmaterial science. The superconducting transition temperature (Tc) of ultrathinFeSe film is significantly enhanced compared to its bulk counterpart andpossibly approaches the liquid nitrogen region according to in situspectroscopic measurements. Particularly, the Fermi surface topology of 1 UCFeSe consists of no hole pockets at Brillouin zone center, which poses a greatchallenge to the well accepted s+- wave pairing nesting the sign differentelectron hole Fermi pockets in iron based superconductors. In this review, wepresent the explorations of Tc enhancement, electron pairing and topologicalphases in 1 UC FeSe on SrTiO3. The potential coexistence of high temperaturesuperconductivity and topological electronic states promotes such twodimensional heterostructure as the candidate of next generation connate hightemperature topological superconductor and (or) topological quantum computationplatform.

Heterostructural one-unit-cell FeSe/SrTiO3: from high-temperature superconductivity to topological states