156 citations · 679 across the 30 of their papers we have counts for
32 papers
Realization of 2/3-layer transition metal dichalcogenides
Ya-Xin Zhao, Zi-Yi Han, Ya-Ning Ren +4
Layered van der Waals transition metal dichalcogenides (TMDCs), generally composed of three atomic X-M-X planes in each layer (M = transition metal, X = chalcogen), provide versati…
Characterization and manipulation of intervalley scattering induced by an individual monovacancy in graphene
Yu Zhang, Fei Gao, Shiwu Gao +2
Intervalley scattering involves microscopic processes that electrons are scattered by atomic-scale defects on nanometer length scales. Although central to our understanding of elec…
Recent advances of defect-induced spin and valley polarized states in graphene
Yu Zhang, Liangguang Jia, Yaoyao Chen +2
Electrons in graphene have fourfold spin and valley degeneracies owing to the unique bipartite honeycomb lattice and an extremely weak spin-orbit coupling, which can support a seri…
Oscillations of van Hove singularities spacing induced by sub-Angstrom fluctuations of interlayer spacing in graphene superlattices
Ya-Xin Zhao, Xiao-Feng Zhou, Yu Zhang +1
Physical properties of two-dimensional van der Waals (vdWs) structures depend sensitively on both stacking orders and interlayer interactions. Yet, in most cases studied to date, t…
Local Measurements of Shubnikov-de Haas Oscillations in Graphene Systems
Ya-Ning Ren, Mo-Han Zhang, Chao Yan +2
Shubnikov-de Haas (SdH) oscillations, the most well-known magneto-oscillations caused by the quantization of electron energy levels in the presence of magnetic fields in two-dimens…
Twistronics in graphene-based van der Waals structures
Ya-Ning Ren, Yu Zhang, Yi-Wen Liu +1
The electronic properties of van der Waals (vdW) structures can be substantially modified by the moire superlattice potential, which strongly depends on the twist angle among the c…
Pseudospin-mediated Atomic-scale Vortices and Their Quantum Interferences in Monolayer Graphene
Yu Zhang, Lin He
Vortex is a universal and significant phenomenon that has been known for centuries. However, creating vortices to the atomic limit has remained elusive because that the characteris…
Tunable lattice reconstruction and bandwidth of flat bands in magic-angle twisted bilayer graphene
Yi-Wen Liu, Ying Su, Xiao-Feng Zhou +10
The interplay between interlayer van der Waals interaction and intralayer lattice distortion can lead to structural reconstruction in slightly twisted bilayer graphene (TBG) with t…
Robust two-dimensional ice on graphene built from finite-length water molecular chains
Sheng Han, Jia-Bin Qiao, Lin-Fang Hou +7
Interfacial ice on graphene has attracted much attention because it is a model system to study two-dimensional (2D) ice structures on chemically inert substrates. While water-graph…
Intervalley quantum interference and measurement of Berry phase in bilayer graphene
Yu Zhang, Ying Su, Lin He
Chiral quasiparticles in Bernal-stacked bilayer graphene have valley-contrasting Berry phases of 2π. This nontrival topological structure, associated with the pseudospin winding al…
Chiral SO(4) spin-valley density wave and degenerate topological superconductivity in magic-angle-twisted bilayer-graphene
Chen Lu, Yongyou Zhang, Yu Zhang +6
Starting from a realistic extended Hubbard model for a -orbital tight-binding model on the Honeycomb lattice, we perform a thorough investigation on the possible electron…
Electron interactions in strain-induced zero-energy flat band in twisted bilayer graphene near the magic angle
Yu Zhang, Zhe Hou, Ya-Xin Zhao +6
In the vicinity of the magic angle in twisted bilayer graphene (TBG), the two low-energy van Hove singularities (VHSs) become exceedingly narrow1-10 and many exotic correlated stat…
Nanoscale Probing of Broken-Symmetry States in Graphene Induced by Individual Atomic Impurities
Yu Zhang, Qi-Qi Guo, Si-Yu Li +1
Inherent symmetries of a system lead to multiple degeneracies of its energy spectra. Introducing individual atomic impurities can locally break these symmetries, which is expected…
Experimental evidence for orbital magnetic moments generated by moiré-scale current loops in twisted bilayer graphene
Si-Yu Li, Yu Zhang, Ya-Ning Ren +3
A remarkable property of twisted bilayer graphene (TBG) with small twist angle is the presence of a well-defined and conserved low-energy valley degrees of freedom1, which can pote…
Spectroscopic evidence for a spin and valley polarized metallic state in a non-magic-angle twisted bilayer graphene
Ya-Ning Ren, Chen Lu, Yu Zhang +7
In the magic-angle twisted bilayer graphene (MA-TBG), strong electron-electron (e-e) correlations caused by the band-flattening lead to many exotic quantum phases such as supercond…
Scanning tunneling microscope characterizations of a circular graphene resonator realized with p-p junctions
Ya-Ning Ren, Jiao-Jiao Zhou, Zhong-Qiu Fu +11
Using low-temperature high-magnetic-field scanning tunneling microscopy and spectroscopy (STM/STS), we systematically study a graphene quantum dot (GQD) defined by a circular graph…
Relativistic Artificial Molecules Realized by Two Coupled Graphene Quantum Dots
Zhong-Qiu Fu, Yue-Ting Pan, Jiao-Jiao Zhou +6
Coupled quantum dots (QDs), usually referred to as artificial molecules, are important not only in exploring fundamental physics of coupled quantum objects, but also in realizing a…
STM Study of Quantum Hall Isospin Ferromagnetic States of Zero Landau Level in Graphene Monolayer
Si-Yu Li, Yu Zhang, Long-Jing Yin +1
A number of quantum Hall isospin ferromagnetic (QHIFM) states have been predicted in the relativistic zero Landau level (LL) of graphene monolayer. These states, especially the sta…
Observation of Giant Quantized Phonon Modes in Graphene via Tunneling Spectra
Yu Zhang, Qian Yang, Lin He
Phonons, the fundamental vibrational modes of a crystal lattice, play a crucial role in determining electronic properties of materials through electron-phonon interaction. However,…
High-magnetic-field Tunneling Spectra of ABC-Stacked Trilayer Graphene
Long-Jing Yin, Li-Juan Shi, Si-Yu Li +3
ABC-stacked trilayer graphene (TLG) are predicted to exhibit novel many-body phenomena due to the existence of almost dispersionless flat-band structures near the charge neutrality…
Tunable magnetism of a single-carbon vacancy in graphene
Yu Zhang, Fei Gao, Shiwu Gao +1
Removing a single-carbon vacancy introduces (quasi-)localized states for both and electrons in graphene. Interactions between the localized dangling bond and quasilocalized electro…
Magnetism near half-filling of a van Hove singularity in twisted graphene bilayer
Yi-Wen Liu, Jia-Bin Qiao, Chao Yan +3
Twisted graphene bilayers (TGBs) have low-energy van Hove singularities (VHSs) that are strongly localized around AA-stacked regions of the moire pattern. Therefore, they exhibit n…
High-resolution Tunneling Spectroscopy of ABA-stacked Trilayer Graphene
Yu Zhang, Jia-Bin Qiao, Long-Jing Yin +1
ABA-stacked trilayer graphene (TLG), the simplest system consisting of both massless and massive Dirac fermions, is expected to exhibit many interesting broken-symmetry quantum Hal…
Spatial Confinement, Magnetic Localization and Their Interactions on Massless Dirac Fermions
Zhong-Qiu Fu, Yu Zhang, Jia-Bin Qiao +8
It is of keen interest to researchers understanding different approaches to confine massless Dirac fermions in graphene, which is also a central problem in making electronic device…