Featured Speaker: Yuanbo Zhang (Fudan University, Shangehai, China)

Two-Dimensional High-T_c​ Superconductivity in Monolayer Cuprates and Beyond
Copper oxide high-temperature superconductors share a layered structure, raising the question of whether superconductivity can emerge in an isolated monolayer. We investigate the electronic structure of monolayer Bi-2212 and Bi-2201, demonstrating through STM/STS that the full suite of bulk phases—including high-Tc​ superconductivity, pseudogap, and charge order—persists in the extreme 2D limit. These results indicate that superconductivity in these materials is essentially a two-dimensional phenomenon.

However, extending this research to other high-T_c material systems is often hindered by extreme environmental sensitivity. To address this, we have developed an integrated fabrication platform operating entirely under ultra-high vacuum (with base pressure below 5×10⁻¹⁰ mbar). This system enables the exfoliation and assembly of atomically clean 2D heterostructures, providing a pristine environment to explore the next generation of 2D high-T_c superconductors.

Location: BRIM 311
Date &Time: October 15, 10:00-11:00am