MajuLab Seminar by Abdullah Rasmita – 15 March 2023

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Abdullah Rasmita 

Abdullah Rasmita is a research fellow in Quantum Photonics group at Nanyang Technological University, Singapore. His research interests include quantum optics and optoelectronics in lowdimensional solid-state systems.

Optical excitation on 2D heterostructure 

Two-dimensional (2D) materials offer a new platform for exploring basic science and new technology development. Due to their atomic layer thickness, their properties can be effectively tuned using external control, such as electrical gating. Moreover, a moiré superlattice potential can be created by layer engineering 2D heterostructures, further modulating their properties. In this talk, I will discuss the effect of optical excitation on 2D transition metal dichalcogenide (TMD) heterostructures, focusing on the valley degree of freedom and moiré potential. I will discuss how optical excitation can result in a gate tunable valley current and how moiré potential can be probed using optical excitation. I will also discuss our recent results [1,2] and possible development related to this topic.

References
[1] Jiang, C., Rasmita, A., Ma, H., et al., Nat. Electron. 5.1 (2022): 23-27.
[2] Tan, Q., Rasmita, A., et al., Phys. Rev. Lett. 129.24 (2022): 247401.

MajuLab is an international joint research unit of the CNRS, UCA, SU, NUS and NTU in Singapore (IRL 3654), hosted by CQT and SPMS.