595 citations · 2.3k across the 13 of their papers we have counts for
13 papers
Local Optical Conductivity of Bilayer Graphene with Kink Potential
Zhen-Bing Dai, Zhiqiang Li, Yan He
We study the optical response of bilayer graphene with a kink potential composed of a domain wall separating two AB regions with opposite interlayer bias. The band structure and th…
Effects of heterostrain and lattice relaxation on optical conductivity of twisted bilayer graphene
Zhen-Bing Dai, Yan He, Zhiqiang Li
We present a theoretical study of the effects of heterostrain and lattice relaxation on the optical conductivity of twisted bilayer graphene near the magic angle, based on the band…
Magnetic brightening and control of dark excitons in monolayer WSe2
Xiao-Xiao Zhang, Ting Cao, Zhengguang Lu +9
Monolayer transition metal dichalcogenide (TMDC) crystals, as direct-gap materials with unusually strong light-matter interaction, have attracted much recent attention. In contrast…
Multiple Hot-Carrier Collection in Photo-Excited Graphene Moire Superlattices
Sanfeng Wu, Lei Wang, You Lai +10
In conventional light harvesting devices, the absorption of a single photon only excites one electron, which sets the standard limit of power-conversion efficiency, such as the Sho…
Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe2
Yilei Li, Jonathan Ludwig, Tony Low +12
We have measured circularly polarized photoluminescence in monolayer MoSe2 under perpendicular magnetic fields up to 10 T. At low doping densities, the neutral and charged excitons…
Temperature-driven band inversion in PbSnSe: Optical and Hall-effect studies
Naween Anand, Zhiguo Chen, Sanal Buvaev +7
Optical and Hall-effect measurements have been performed on single crystals of PbSnSe, a IV-VI mixed chalcogenide. The temperature dependent (10--300 K) reflectan…
Observation of an intrinsic bandgap and Landau level renormalization in graphene/boron-nitride heterostructures
Zhi-Guo Chen, Zhiwen Shi, Wei Yang +6
Van der Waals heterostructures formed by assembling different two-dimensional atomic crystals into stacks can lead to many new phenomena and device functionalities. In particular,…
Tunable Infrared Phonon Anomalies in Trilayer Graphene
Chun Hung Lui, Emmanuele Cappelluti, Zhiqiang Li +1
Trilayer graphene in both ABA (Bernal) and ABC (rhombohedral) stacking sequences is shown to exhibit intense infrared absorption from in-plane optical phonons. The feature, lying a…
Plasmonics of coupled graphene micro-structures
Hugen Yan, Fengnian Xia, Zhiqiang Li +1
The optical response of graphene micro-structures, such as micro-ribbons and disks, is dominated by the localized plasmon resonance in the far infrared (IR) spectral range. An ense…
Magnetic field tuning of terahertz Dirac plasmons in graphene
Hugen Yan, Zhiqiang Li, Xuesong Li +3
Boundaries and edges of a two dimensional system lower its symmetry and are usually regarded, from the point of view of charge transport, as imperfections. Here we present a first…
Structurally Dependent Fano Resonances in the Infrared Spectra of Phonons in Few-Layer Graphene
Zhiqiang Li, Chun Hung Lui, Emmanuele Cappelluti +5
The in-plane optical phonons around 200 meV in few-layer graphene are investigated utilizing infrared absorption spectroscopy. The phonon spectra exhibit unusual asymmetric feature…
Observation of an electrically tunable band gap in trilayer graphene
Chun Hung Lui, Zhiqiang Li, Kin Fai Mak +2
A striking feature of bilayer graphene is the induction of a significant band gap in the electronic states by the application of a perpendicular electric field. Thicker graphene la…
Imaging Stacking Order in Few-Layer Graphene
Chun Hung Lui, Zhiqiang Li, Zheyuan Chen +3
Few-layer graphene (FLG) has been predicted to exist in various crystallographic stacking sequences, which can strongly influence the electronic properties of FLG. We demonstrate a…