156 citations · 1.2k across the 32 of their papers we have counts for
34 papers
Correlation-induced symmetry-broken states in large-angle twisted bilayer graphene on MoS2
Kaihui Li, Long-Jing Yin, Chenglong Che +6
Strongly correlated states are commonly emerged in twisted bilayer graphene (TBG) with magic-angle, where the electron-electron (e-e) interaction U becomes prominent relative to th…
Recent progresses of quantum confinement in graphene quantum dots
Si-Yu Li, Lin He
Graphene quantum dots (GQDs) not only have potential applications on spin qubit,but also serve as essential platforms to study the fundamental properties of Dirac fermions, such as…
Imaging topological torus lattice from an electron crystal in twisted mono-bilayer graphene
Si-yu Li, Zhengwen Wang, Yucheng Xue +9
A variety of exotic quantum phases of matter have been created by Van der Waals heterostructures. Moreover, these twisted heterostructures provide a feasible way of braiding correl…
Spatial and Magnetic Confinement of Massless Dirac Fermions
Ya-Ning Ren, Qiang Cheng, Chao Yan +4
The massless Dirac fermions and the ease to introduce spatial and magnetic confinement in graphene provide us unprecedented opportunity to explore confined relativistic matter in t…
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…
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…
A Movable Valley Switch Driven by Berry Phase in Bilayer Graphene Resonators
Yi-Wen Liu, Zhe Hou, Si-Yu Li +2
Since its discovery, Berry phase has been demonstrated to play an important role in many quantum systems. In gapped Bernal bilayer graphene, the Berry phase can be continuously tun…
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…
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…
Valley Polarization and Inversion in Strained Graphene via Pseudo-Landau Levels, Valley Splitting of Real Landau Levels and Confined States
Si-Yu Li, Ying Su, Ya-Ning Ren +1
It is quite easy to control spin polarization and spin direction of a system via magnetic fields. However, there is no such a direct and efficient way to manipulate valley pseudosp…
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…
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…
Detecting degeneracy and subtle broken-symmetry states of graphene at nanoscale
Si-Yu Li, Ya-Ning Ren, Yi-Wen Liu +3
Measuring degeneracy and broken-symmetry states of a system at nanoscale requires extremely high energy and spatial resolution, which has so far eluded direct observation. Here, we…
Magnetic-field-controlled negative differential conductance in graphene npn junction resonators
Si-Yu Li, Haiwen Liu, Jia-Bin Qiao +2
Negative differential conductance (NDC), characterized by the decreasing current with increasing voltage, has attracted continuous attention for its various novel applications. The…
The tunnelling spectra of quasi-free-standing graphene monolayer
Si-Yu Li, Ke-Ke Bai, Wei-Jie Zuo +7
With considering the great success of scanning tunnelling microscopy (STM) studies of graphene in the past few years, it is quite surprising to notice that there is still a fundame…
Scanning tunneling microscopy and spectroscopy of nanoscale twisted bilayer graphene
Wen-Xiao Wang, Hua Jiang, Yu Zhang +5
Nanoscale twisted bilayer graphene (TBG) is quite instable and will change its structure to Bernal (or AB-stacking) bilayer with a much lower energy. Therefore, the lack of nanosca…
Landau quantization of Dirac fermions in graphene and its multilayer
Long-jing Yin, Ke-ke Bai, Wen-xiao Wang +3
When electrons are confined in a two dimensional (2D) system, typical quantum mechanical phenomena such as Landau quantization can be detected. Graphene systems, including the sing…
Imaging the dynamics of individual hydrogen atom intercalated between two graphene sheets
Wen-Xiao Wang, Yi-Wen Wei, Si-Yu Li +4
The interlayer gallery between two adjacent sheets of van der Waals materials is expected to modify properties of atoms and molecules confined at the atomic interfaces. Here, we di…
Evidence of electron-electron interactions around Van Hove singularities of a graphene Moiré superlattice
Si-Yu Li, Ke-Qin Liu, Long-Jin Yin +7
A variety of new and interesting correlated states have been predicted in graphene monolayer doped to Van Hove singularities (VHSs) of its density-of-state (DOS). However, tuning t…
Corrugation induced stacking solitons with topologically confined states in gapped bilayer graphene
Si-Yu Li, Hua Jiang, Jiao-Jiao Zhou +3
Graphene, as an atomic-thick ultrasoft membrane, almost has no resistance against out-of-plane deformations and, therefore, it is always wrinkled to a certain degree. Recently, cor…
Floquet High Chern Insulators in Periodically Driven Chirally Stacked Multilayer Graphene
Si Li, Cheng-Cheng Liu, Yugui Yao
Chirally stacked -layer graphene is a semimetal with band-touching at two nonequivalent corners in its Brillioun zone. We predict that an off-resonant circularly polar…