61 citations · 256 across the 19 of their papers we have counts for
20 papers
Twist and strain identification in moiré heterostructures
Zhen Zhan, Federico Escudero, Dong Wang +4
The geometrical and electronic properties of moiré materials are highly sensitive to the twist and strain in the samples due to the moiré magnifying effect. Accurate identification…
Visualizing orbital angular momentum induced single wavefront dislocation in graphene
Yi-Wen Liu, Yu-Chen Zhuang, Ya-Ning Ren +5
Phase singularities are phase-indeterminate points where wave amplitudes are zero, which manifest as phase vertices or wavefront dislocations. In the realm of optical and electron…
Breakdown of self-cleaning mechanism for nanoscale interfacial substances in tiny-angle twisted bilayer graphene
Chao Yan, Ya-Xin Zhao, Yi-Wen Liu +1
Realization of high-quality van der Waals (vdW) heterostructures with tailored properties by stacking two-dimensional (2D) layers requires atomically clean interfaces. Because of s…
Coexistence of Reconstructed and Unreconstructed Structures in Structural Transition Regime of Twisted Bilayer Graphene
Xiao-Feng Zhou, Yi-Wen Liu, Chen-Yue Hao +7
In twisted bilayer graphene (TBG), a twist-angle-dependent competition between interlayer stacking energy and intralayer elastic energy results in flat rigid layers at large twist…
Realizing One-dimensional Metallic States in Graphene via Periodically Coupled Zeroth Pseudo-Landau Levels
Yi-Wen Liu, Zhen Zhan, Zewen Wu +3
Strain-induced pseudo-magnetic fields can mimic real magnetic fields to generate a zero-magnetic-field analogue of the Landau levels (LLs), i.e., the pseudo-LLs, in graphene. The d…
Direct Imaging Strain-field Vortex Networks in Twisted Bilayer Graphene Magnified by Moiré Superlattices
Ya-Ning Ren, Yi-Wen Liu, Chao Yan +1
In two-dimensional (2D) twisted bilayers, the van der Waals (vdW) interlayer interaction introduces atomic-scale reconstruction at interface by locally rotating lattice to form str…
Electronic confinement in quantum dots of twisted bilayer graphene
Xiao-Feng Zhou, Yi-Wen Liu, Hong-Yi Yan +3
Electronic properties of quantum dots (QDs) depend sensitively on their parent materials. Therefore, confined electronic states in graphene QDs (GQDs) of monolayer and Bernal-stack…
Tailoring energy landscape of graphene nanostructures on graphene and realizing atomically precise graphene origami using tilt grain boundaries
Yi-Wen Liu, Chen-Yue Hao, Lin He
In two-dimensional van der Waals (vdWs) materials, the relative twist angle between adjacent layers not only controls their electronic properties, but also determines their stackin…
Direct observation of magneto-electric Aharonov-Bohm effect in moiré-scale quantum paths of minimally twisted bilayer graphene
Yi-Wen Liu, Ya-Ning Ren, Chen-Yue Hao +1
Aharonov-Bohm (AB) effect, the well-known archetype of electron-wave interference phenomena, has been explored extensively through transport measurements. However, these techniques…
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…
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…
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…
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…
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…
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…
Generating nanoscale and atomically-sharp p-n junctions in graphene via monolayer-vacancy-island engineering of Cu surface
Ke-Ke Bai, Jiao-Jiao Zhou, Yi-Cong Wei +5
Creation of high quality p-n junctions in graphene monolayer is vital in studying many exotic phenomena of massless Dirac fermions. However, even with the fast progress of graphene…