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9 papers
Determining layer number of two dimensional flakes of transition-metal dichalcogenides by the Raman intensity from substrate
Xiao-Li Li, Xiao-Fen Qiao, Wen-Peng Han +4
Transition-metal dichalcogenide (TMD) semiconductors have been widely studied due to their distinctive electronic and optical properties. The property of TMD flakes is a function o…
Polytypism and Unexpected Strong Interlayer Coupling of two-Dimensional Layered ReS2
Xiao-Fen Qiao, Jiang-Bin Wu, Lin-Wei Zhou +7
The anisotropic two-dimensional (2D) van der Waals (vdW) layered materials, with both scientific interest and potential application, have one more dimension to tune the properties…
Exciton valley dynamics in monolayer WSe2 probed by the two-color ultrafast Kerr rotation
Tengfei Yan, Xiaofen Qiao, Pingheng Tan +1
The newly developed two-dimensional layered materials provide perfect platform for valley-spintronics exploration. To determine the prospect of utilizing the valley degree of freed…
Substrate-free layer-number identification of two-dimensional materials: A case of MoWS alloy
Xiao-Fen Qiao, Xiao-Li Li, Xin Zhang +4
Any of two or more two-dimensional (2D) materials with similar properties can be alloyed into a new layered material, namely, 2D alloy. Individual monolayer in 2D alloys are kept t…
Interface coupling in twisted multilayer graphene by resonant Raman spectroscopy of layer breathing modes
Jiang-Bin Wu, Zhi-Xin Hu, Xin Zhang +9
Raman spectroscopy is the prime non-destructive characterization tool for graphene and related layered materials. The shear (C) and layer breathing modes (LBMs) are due to relative…
Valley depolarization in monolayer WSe2
Tengfei Yan, Xiaofen Qiao, Pingheng Tan +1
We have systematically examined the circular polarization of monolayer WSe2 at different temperature, excitation energy and exciton density. The valley depolarization in WSe2 is ex…
Phonon and Raman scattering of two-dimensional transition metal dichalcogenides from monolayer, multilayer to bulk material
Xin Zhang, Xiao-Fen Qiao, Wei Shi +3
Two-dimensional (2D) transition metal dichalcogenide (TMD) nanosheets exhibit remarkable electronic and optical properties. The 2D features, sizable bandgaps, and recent advances i…
The Interlayer Shear Modes in Twisted Multi-layer Graphenes: Interlayer coupling, Davydov Splitting and Intensity Resonance
Jiang-Bin Wu, Xin Zhang, Mari Ijas +6
Graphene and other two-dimensional crystals can be combined to form various hybrids and heterostructures, creating materials on demand, in which the interlayer coupling at the inte…
Strain tuning of optical emission energy and polarization in monolayer and bilayer MoS2
G. Wang, C. R. Zhu, B. L. Liu +7
We use micro-Raman and photoluminescence (PL) spectroscopy at 300K to investigate the influence of uniaxial tensile strain on the vibrational and optoelectronic properties of monol…