FEIT Research Project Database

2D material valleytronics for information processing


Project Leader: Sejeong Kim
Primary Contact: Sejeong Kim (sejeong.kim@unimelb.edu.au)
Keywords: Nanophotonic; nanotechnology; network science; photonics and electronics; Quantum Materials
Disciplines: Electrical & Electronic Engineering
Domains:

Light-based technology shaped our world far beyond what people could have imagined 20 years ago. For example, optical communication via optical fibers connected people all over the globe within seconds reach. Scientists foresee the potential impact that new discoveries in photonics could bring for future communication and computing technology, due to the fact that photons can possess multiple degrees of freedom that significantly increase the data bandwidth. Recently, a new type of degree of freedom is discovered from 2D materials known as the ‘valley degree of freedom’. This means that photons from two energetically-degenerated momentum space, called K and K’, could be discernable. The broken inversion symmetry in the 2D materials enables a new optical system that could selectively excite and optically readout the valley information—which valley the electron decay happened—by using light with spin angular momentum (SAM), ie, circularly polarised light. In this project, we will employee plasmonics and nanophotonics to solve some of the challenging problems in valleytronics.

The broken inversion symmetry in the 2D materials enables a new optical system studying Valleytronics.
test
Optical manipulation of the valley.
test