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Directional Interlayer Spin-Valley Transfer in Two-Dimensional Heterostructures
John R. Schaibley, Pasqual Rivera, Hongyi Yu +7
Van der Waals heterostructures formed by two different monolayer semiconductors have emerged as a promising platform for new optoelectronic and spin/valleytronic applications. In a…
Many-body effects in nonlinear optical responses of 2D layered semiconductors
Grant Aivazian, Hongyi Yu, Sanfeng Wu +5
We performed ultrafast degenerate pump-probe spectroscopy on monolayer WSe2 near its exciton resonance. The observed differential reflectance signals exhibit signatures of strong m…
Edge conduction in monolayer WTe2
Zaiyao Fei, Tauno Palomaki, Sanfeng Wu +7
A two-dimensional topological insulator (2DTI) is guaranteed to have a helical 1D edge mode in which spin is locked to momentum, producing the quantum spin Hall effect and prohibit…
Probing the influence of dielectric environment on excitons in monolayer WSe2: Insight from high magnetic fields
Andreas V. Stier, Nathan P. Wilson, Genevieve Clark +2
Excitons in atomically-thin semiconductors necessarily lie close to a surface, and therefore their properties are expected to be strongly influenced by the surrounding dielectric e…
Topological mosaic in Moiré superlattices of van der Waals heterobilayers
Qingjun Tong, Hongyi Yu, Qizhong Zhu +3
Van der Waals (vdW) heterostructures formed by 2D atomic crystals provide a powerful approach towards designer condensed matter systems. Incommensurate heterobilayers with small tw…
Silicon photonic crystal cavity enhanced second-harmonic generation from monolayer WSe2
Taylor K. Fryett, Kyle L. Seyler, Jiajiu Zheng +3
Nano-resonator integrated with two-dimensional materials (e.g. transition metal dichalcogenides) have recently emerged as a promising nano-optoelectronic platform. Here we demonstr…