Event Date:
Event Location:
- 1605 Elings Hall
Related Link:
- ITST Seminar
Yanmeng Shi, UC Riverside
The study of two-dimensional (2D) materials began with the seminal work of experimental isolation of monolayer graphene in 2004, and has remained one of the frontiers of condensed matter physics ever since. Mono- and few-layer graphene, which host chiral charge carriers with competing symmetries (valley, spin and orbital), have proved to be fascinating platforms for investigating the quantum Hall (QH) physics. Research efforts were soon extended to other 2D materials. One such material is phosphorene (mono- or few-layer black phosphorous), which has attracted much attention due to its large direct band gap and high mobility. In this talk, I will present our comprehensive transport studies of bi- and tetra-layer graphene, as well as few-layer phosphorene (FLP). In bi-layer graphene (BLG), the interplay between symmetries and electric and magnetic felds gives rise to two distinct phases of the QH state at flling factor f = 1, with different pseudospin and real spin polarizations. Using transport spectroscopy, we investigate the energy gaps and transitions at flling factors f = 1 and 2/3. In another graphene system, we observe unusual transport behavior at B = 0 in hexagonal boron nitride (hBN)-encapsula