Bandgap Engineering of Black Phosphorus

• Speaker: Prof. Keun-Su Kim (Yonsei Univ.)
• Date: Wednesday, November 29, 2017, at 17:00
• Place: Jungho Seminar

Two-dimensional (2D) van-der-Waals crystals have emerged as a class of materials that may impact our future electronics technologies. A key issue is controlling their electronic band structures to overcome the limit of natural properties. Black phosphorus is an emergent 2D semiconductor that has attracted growing interest owing to promising device characteristics¹. In this talk, I will introduce our recent angle-resolved photoemission spectroscopy (ARPES) studies on the mechanism of controlling the band gap of black phosphorus² and transition metal dichalcogenides³ (termed surface Stark effect). I will also talk about how the widely tunable band gap of black phosphorus can be exploited to artificially create and study a topologically nontrivial quantum state at the surface of normal 2D semiconductors

• Reference

[1] X. Ling et al., PNAS 112, 4523 (2014). [2] J. Kim et al., Science 349, 723 (2015). [3] M. Kang et al., Nano Lett 17, 1610 (2017). [4] J. Kim et al., under review.