Topological mosaics in moire superlattices of van der Waals heterobilayers

@article{Tong2017TopologicalMI,
  title={Topological mosaics in moire superlattices of van der Waals heterobilayers},
  author={Qingjun Tong and Hongyi Yu and Qizhong Zhu and Yong Wang and Xiaodong Xu and Wang Yao},
  journal={Nature Physics},
  year={2017},
  volume={13},
  pages={356-362}
}
Engineering moire superlattices by stacking two-dimensional crystals could enable lateral superstructures to be formed where the local topological phase is periodically modulated, creating topological mosaics that are electrically switchable. Van der Waals (vdW) heterostructures formed by two-dimensional atomic crystals provide a powerful approach towards designer condensed matter systems1,2,3,4,5,6,7,8,9,10,11,12,13,14,15. Incommensurate heterobilayers with small twisting and/or lattice… 
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Moiré enhanced charge density wave state in twisted 1T-TiTe2/1T-TiSe2 heterostructures
  • Wei-min Zhao, Li Zhu, +7 authors Shao-Chun Li
  • Medicine
    Nature Materials
  • 2021
TLDR
This study synthesized the epitaxial heterostructure of 1T-TiTe2/1T- TiSe2 with various twist angles using molecular beam epitaxy and investigated the moiré pattern induced/enhanced charge density wave (CDW) states with scanning tunnelling microscopy, paving the way for constructing metallic twist van der Waals bilayers and tuning many-body effects via moirÉ engineering.
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References

SHOWING 1-10 OF 40 REFERENCES
Cloning of Dirac fermions in graphene superlattices
TLDR
Graphene superlattices such as this one provide a way of studying the rich physics expected in incommensurable quantum systems and illustrate the possibility of controllably modifying the electronic spectra of two-dimensional atomic crystals by varying their crystallographic alignment within van der Waals heterostuctures.
Topological Bloch bands in graphene superlattices
TLDR
A designer approach to endow widely available plain materials with topological properties by stacking them atop other nontopological materials is outlined, illustrated with a model system comprising graphene stacked atop hexagonal boron nitride.
Ab-Initio Theory of Moiré Superlattice Bands in Layered Two-Dimensional Materials
When atomically thin two-dimensional (2D) materials are layered they often form incommensurate non-crystalline structures that exhibit long-period moir{\' e} patterns when examined by scanning
Strong interlayer coupling in van der Waals heterostructures built from single-layer chalcogenides
TLDR
Artificial semiconductor heterostructures built from single-layer WSe2 and MoS2 observe a large Stokes-like shift of ∼100 meV between the photoluminescence peak and the lowest absorption peak that is consistent with a type II band alignment having spatially direct absorption but spatially indirect emission.
Valley-polarized exciton dynamics in a 2D semiconductor heterostructure
TLDR
This work created interlayer exciton spin-valley polarization by means of circularly polarized optical pumping and determined a valley lifetime of 40 nanoseconds, which enables the visualization of the expansion of a valley-polarized exciton cloud over several micrometers.
Ultrafast charge transfer in atomically thin MoS₂/WS₂ heterostructures.
TLDR
It is shown that hole transfer from the MoS2 layer to the WS2 layer takes place within 50 fs after optical excitation, a remarkable rate for van der Waals coupled two-dimensional layers, which can enable novel two- dimensional devices for optoelectronics and light harvesting.
Photovoltaic Effect in an Electrically Tunable van der Waals Heterojunction
TLDR
A type-II van der Waals heterojunction made of molybdenum disulfide and tungsten diselenide monolayers and under appropriate gate bias an atomically thin diode is realized, which exhibits a photovoltaic effect.
Van der Waals heterostructures
TLDR
With steady improvement in fabrication techniques and using graphene’s springboard, van der Waals heterostructures should develop into a large field of their own.
Evolution of interlayer coupling in twisted molybdenum disulfide bilayers.
TLDR
This work demonstrates the evolution of interlayer coupling with twist angles in as-grown molybdenum disulfide bilayers and finds that the indirect bandgap size varies appreciably with the stacking configuration: it shows the largest redshift for AA- and AB-stacked bilayers, and a significantly smaller but constantRedshift for all other twist angles.
Massive Dirac Fermions and Hofstadter Butterfly in a van der Waals Heterostructure
TLDR
Band structure engineering in a van der Waals heterostructure composed of a monolayer graphene flake coupled to a rotationally aligned hexagonal boron nitride substrate is demonstrated, resulting in an unexpectedly large band gap at charge neutrality.
...
1
2
3
4
...