(3:30~4:00pm, Tea, Coffee, and Cookie)

By direct transport and magnetic measurements, we provide first direct evidence for high temperature
superconductivity in the one unit cell (1-UC) FeSe films on insulating STO substrates with the onset
Tc and critical current density much higher than those for bulk FeSe. This work may pave the way to
enhancing and tailoring superconductivity by interface engineering. [1-3]Furthermore, by both in situ
scanning tunneling microscopy/spectroscopy and ex situ transport and magnetization measurements,
we find that the two-atomic-layer Ga film with graphene-like structure on wide band-gap
semiconductor GaN is superconducting with Tc up to 5.4 K. This work offers a new platform to study
two-dimensional (2D) superconductivity in metal-semiconductor heterostructures. [4] In addition, we
firstly observe the superconductivity in crystalline 3D Dirac semimetal Cd3As2 with some signatures
showing the possibility of topological superconductivity. [5,6]

References
[1] Chin. Phys. Lett. 31, 017401 (2014);
[2] Science 343, 230 (2014);
[3] ScientificReports 4, 6040 (2014);
[4] Physical Review Letters 114, 107003(2015) (Editors’ Suggestion);
[5] arXiv:1412.0330
[6] arXiv:1501.00418.