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Substrate dopant induced electronic inhomogeneity in epitaxial bilayer graphene
Shuai Zhang, Di Huang, Lehua Gu +2
Two-dimensional (2D) materials have become a new territory for exploring novel properties and functionalities because of their superior tunability. The unprecedented tunability of…
Direct observation of van der Waals stacking dependent interlayer magnetism
Weijong Chen, Zeyuan Sun, Lehua Gu +3
Controlling the crystal structure is a powerful approach for manipulating the fundamental properties of solids. Unique to two-dimensional (2D) van der Waals materials, the control…
Chiral selection rules for multi-photon processes in two-dimensional honeycomb materials
Jingxin Cheng, Di Huang, Tao Jiang +4
We examined the chirality dependent optical selection rules in two-dimensional monolayer materials with the honeycomb lattice, and based on symmetry argument, we generalized these…
Doping Induced Second Harmonic Generation in Centrosymmetric Graphene from Quadrupole Response
Yu Zhang, Di Huang, Yuwei Shan +8
For centrosymmetric materials such as monolayer graphene, no optical second harmonic generation (SHG) is generally expected because it is forbidden under the electric-dipole approx…
Stacking-symmetry governed second harmonic generation in graphene trilayers
Yuwei Shan, Yingguo Li, Di Huang +4
Crystal symmetry plays a central role in governing a wide range of fundamental physical phenomena. One example is the nonlinear optical second harmonic generation (SHG), which requ…
Gate tunable third-order nonlinear optical response of massless Dirac fermions in graphene
Tao Jiang, Di Huang, Jinluo Cheng +13
Materials with massless Dirac fermions can possess exceptionally strong and widely tunable optical nonlinearities. Experiments on graphene monolayer have indeed found very large th…
Two-photon Induced Hot Electron Transfer to a Single Molecule in a Scanning Tunneling Microscope
Shiwei Wu, Wilson Ho
The junction of a scanning tunneling microscope (STM) operating in the tunneling regime was irradiated with femtosecond laser pulses. A photo-excited hot electron in the STM tip re…