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22 papers
Observation of Integer and Fractional Chern insulators in high Chern number flatbands
Jingwei Dong, Le Liu, Jundong Zhu +11
Moiré flatbands with high Chern numbers (C>1) offer opportunities to study the fractional quantum anomalous Hall effects that go beyond the Landau level paradigm with C=1, which re…
Electric field tunable coupling strength and quantum metric hot spots in a moiré flatband superconductor
Le Liu, Yu Hong, Chengping Zhang +9
Superconductivity in flatband systems has attracted tremendous attention in condensed matter physics. Alternating twisted multilayer graphene presents a compelling multiband system…
Probing band topology in ABAB and ABBA stacked twisted double bilayer graphene
Jundong Zhu, Le Liu, Yalong Yuan +10
Twisted graphene moire superlattice has been demonstrated as an exotic platform for investigating correlated states and nontrivial topology. Among the moire family, twisted double…
Observation of electrical high-harmonic generation
Xiaozhou Zan, Ming Gong, Zitian Pan +12
High-harmonic generation (HHG), an extreme nonlinear effect, introduces an unprecedented paradigm to detect emergent quantum phases and electron dynamics inconceivable in the frame…
Correlated Charge Density Wave Insulators in Chirally Twisted Triple Bilayer Graphene
Wenxuan Wang, Gengdong Zhou, Wenlu Lin +16
Electrons residing in flat-band system can play a vital role in triggering spectacular phenomenology due to relatively large interactions and spontaneous breaking of different dege…
Room-temperature correlated states in twisted bilayer MoS
Fanfan Wu, Qiaoling Xu, Qinqin Wang +20
Moiré superlattices have emerged as an exciting condensed-matter quantum simulator for exploring the exotic physics of strong electronic correlations. Notable progress has been wit…
Observation of first-order quantum phase transitions and ferromagnetism in twisted double bilayer graphene
Le Liu, Xin Lu, Yanbang Chu +14
Twisted graphene multilayers are highly tunable flatband systems for developing new phases of matter. Thus far, while orbital ferromagnetism has been observed in valley polarized p…
Electron-infrared phonon coupling in ABC trilayer graphene
Xiaozhou Zan, Xiangdong Guo, Aolin Deng +18
Stacking order plays a crucial role in determining the crystal symmetry and has significant impacts on electronic, optical, magnetic, and topological properties. Electron-phonon co…
Quantum oscillations in field-induced correlated insulators of a moiré superlattice
Le Liu, Yanbang Chu, Guang Yang +14
We report an observation of quantum oscillations (QOs) in the correlated insulators with valley anisotropy of twisted double bilayer graphene (TDBG). The anomalous QOs are best cap…
Layer-by-Layer Epitaxy of Multilayer MoS2 Wafers
Qinqin Wang, Jian Tang, Xiaomei Li +19
Two-dimensional (2D) semiconductor of MoS2 has great potential for advanced electronics technologies beyond silicon1-9. So far, high-quality monolayer MoS2 wafers10-12 are already…
Hofstadter Butterfly in Graphene
Wei Yang, Guangyu Zhang
This is a short review of the recent progresses on Hofstadter butterfly in graphene, organized in the following. We first briefly introduce the Hofstadter butterfly, including the…
Isospin competitions and valley polarized correlated insulators in twisted double bilayer graphene
Le Liu, Shihao Zhang, Yanbang Chu +13
New phase of matter usually emerges when a given symmetry breaks spontaneously, which can involve charge, spin, and valley degree of freedoms. Here, we report an observation of new…
Spatially indirect intervalley excitons in bilayer WSe2
Zhiheng Huang, Yanchong Zhao, Tao Bo +16
Spatially indirect excitons with displaced wavefunctions of electrons and holes play a pivotal role in a large portfolio of fascinating physical phenomena and emerging optoelectron…
Optically and magnetically addressable valley pseudospin of interlayer excitons in bilayer MoS2
Yanchong Zhao, Luojun Du, Shiqi Yang +13
Interlayer valley excitons in bilayer MoS2 feature concurrently large oscillator strength and long lifetime, and hence represent an advantageous scenario for valleytronic applicati…
Temperature-linear Resistivity in Twisted Double Bilayer Graphene
Yanbang Chu, Le Liu, Cheng Shen +13
We report an experimental study of carrier density (n), displacement field (D) and twist angle (θ) dependence of temperature (T)-linear resistivity in twisted double bilayer graphe…
Emergence of Chern insulating states in non-Magic angle twisted bilayer graphene
Cheng Shen, Jianghua Ying, Le Liu +14
Twisting two layers into a magic angle (MA) of ~1.1° is found essential to create low energy flat bands and the resulting correlated insulating, superconducting, and magnetic phase…
High-order minibands and interband Landau level reconstruction in graphene moire superlattice
Xiaobo Lu, Jian Tang, John R. Wallbank +13
The propagation of Dirac fermions in graphene through a long-period periodic potential would result in a band folding together with the emergence of a series of cloned Dirac points…
Superconductors, Orbital Magnets, and Correlated States in Magic Angle Bilayer Graphene
Xiaobo Lu, Petr Stepanov, Wei Yang +10
Superconductivity often occurs close to broken-symmetry parent states and is especially common in doped magnetic insulators. When twisted close to a magic relative orientation angl…
Landau velocity for collective quantum Hall breakdown in bilayer graphene
W. Yang, H. Graef, X. Lu +12
Breakdown of the quantum Hall effect (QHE) is commonly associated with an electric field approaching the inter Landau-level (LL) Zener field, ratio of the Landau gap and cyclotron…
A graphene Zener-Klein transistor cooled by a hyperbolic substrate
W. Yang, S. Berthou, X. Lu +11
Engineering of cooling mechanisms is a bottleneck in nanoelectronics. Whereas thermal exchanges in diffusive graphene are mostly driven by defect assisted acoustic phonon scatterin…
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,…
Gate-dependent Pseudospin Mixing in Graphene/Boron Nitride Moire Superlattices
Zhiwen Shi, Chenhao Jin, Wei Yang +13
Electrons in graphene are described by relativistic Dirac-Weyl spinors with a two-component pseudospin1-12. The unique pseudospin structure of Dirac electrons leads to emerging phe…