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Optimizing Broadband Terahertz Modulation with Hybrid Graphene/Metasurface Structures
S. -F. Shi, B. Zeng, H. -L. Han +6
We demonstrate efficient terahertz (THz) modulation by coupling graphene strongly with a broadband THz metasurface device. This THz metasurface, made of periodic gold slit arrays,…
Ultrafast Charge Transfer in Atomically Thin MoS2/WS2 Heterostructures
Xiaoping Hong, Jonghwan Kim, Su-Fei Shi +7
Van der Waals heterostructures have recently emerged as a new class of materials, where quantum coupling between stacked atomically thin two-dimensional (2D) layers, including grap…
Ultrafast Generation of Pseudo-magnetic Field for Valley Excitons in WSe2 Monolayers
Jonghwan Kim, Xiaoping Hong, Chenhao Jin +5
A new degree of freedom, the valley pseudospin, emerges in atomically thin two-dimensional transition metal dichalcogenides (MX2) and has attracted great scientific interest. The c…
Evolution of Interlayer Coupling in Twisted MoS2 Bilayers
Kaihui Liu, Liming Zhang, Ting Cao +7
Van der Waals (vdW) coupling is emerging as a powerful method to engineer and tailor physical properties of atomically thin two-dimensional (2D) materials. In graphene/graphene and…
Systematic Determination of Absolute Absorption Cross-section of Individual Carbon Nanotubes
Kaihui Liu, Xiaoping Hong, Sangkook Choi +9
Determination of optical absorption cross-section is always among the central importance of understanding a material. However its realization on individual nanostructures, such as…
Intermolecular interactions and substrate effects for an adamantane monolayer on the Au(111) surface
Yuki Sakai, Giang D. Nguyen, Rodrigo B. Capaz +8
We study theoretically and experimentally the infrared (IR) spectrum of an adamantane monolayer on a Au(111) surface. Using a new STM-based IR spectroscopy technique (IRSTM) we are…
High-throughput Imaging and Spectroscopy of Individual Carbon Nanotubes in Devices with Light Microscopy
Kaihui Liu, Xiaoping Hong, Qin Zhou +7
Two paramount challenges in carbon nanotube research are achieving chirality-controlled synthesis and understanding chirality-dependent device physics. High-throughput and in-situ…
Electrical Control of Silicon Photonic Crystal Cavity by Graphene
Arka Majumdar, Jonghwan Kim, Jelena Vuckovic +1
Efficient conversion of electrical signal to optical signal in nano-photonics enables solid state integration of electronics and photonics. Combination of graphene with photonic cr…