Results 41 to 50 of about 2,902 (157)

Correlated states in twisted double bilayer graphene [PDF]

, 2020
Electron-electron interactions play an important role in graphene and related systems and can induce exotic quantum states, especially in a stacked bilayer with a small twist angle. For bilayer graphene where the two layers are twisted by a "magic angle",
Chu, Yanbang, Li, Na, Liu, Jieying, Meng, Zi Yang, Shen, Cheng, Shi, Dongxia, Tang, Jian, Taniguchi, Takashi, Tian, Jinpeng, Wang, Shuopei, Watanabe, Kenji, Wu, QuanSheng, Yang, Rong, Yazyev, Oleg V., Zhang, Guangyu, Zhao, Yanchong   +15 more
core   +2 more sources

Spatially resolved electronic structure of twisted graphene [PDF]

, 2017
We have used scanning tunneling microscopy and spectroscopy to resolve the spatial variation of the density of states of twisted graphene layers on top of a highly oriented pyrolytic graphite substrate.
Bampoulis, Pantelis, de Boeij, Paul L., Haartsen, Sebastiaan, Slotman, Guus J., Sotthewes, Kai, van Bremen, Rik, van Houselt, Arie, Yao, Qirong, Yuan, Shengjun, Zandvliet, Harold J. W., Zhang, Lijie   +10 more
core   +4 more sources

Signatures of Gate-Tunable Superconductivity in Trilayer Graphene/Boron Nitride Moir\'e Superlattice

, 2019
Understanding the mechanism of high temperature (high Tc) superconductivity is a central problem in condensed matter physics. It is often speculated that high Tc superconductivity arises from a doped Mott insulator as described by the Hubbard model.
Chen, Guorui, Fox, Eli, Gallagher, Patrick, Goldhaber-Gordon, David, Jiang, Lili, Jung, Jeil, Li, Hongyuan, Lyu, Bosai, Rosen, Ilan T., Sharpe, Aaron L., Shi, Zhiwen, Taniguchi, Takashi, Wang, Feng, Watanabe, Kenji, Zhang, Yuanbo   +14 more
core   +1 more source

Resolving the Structural Duality of Graphene Grain Boundaries

Advanced Materials, EarlyView.
Cantilever ncAFM resolves the atomic structure of grain boundaries in graphene, revealing coexisting stable and metastable types. Both contain pentagon/heptagon defects, but metastable GBs show irregular geometries. Modeling shows metastable GBs form under compression, exhibiting vertical corrugation, while stable GBs are flat.
Haojie Guo, Emiliano Ventura‐Macías, Mariano D. Jiménez‐Sánchez, Nicoleta Nicoara, Pierre Mallet, Jean‐Yves Veuillen, Vincent T. Renard, Antonio J. Martínez‐Galera, Pablo Pou, Julio Gómez‐Herrero, Rubén Pérez, Iván Brihuega   +11 more
wiley   +1 more source

Excess resistivity in graphene superlattices caused by umklapp electron-electron scattering [PDF]

, 2018
Umklapp processes play a fundamental role as the only intrinsic mechanism that allows electrons to transfer momentum to the crystal lattice and, therefore, provide a finite electrical resistance in pure metals.
Aleiner, I. L., Auton, G. H., Birkbeck, J., Fal'ko, V. I., Geim, A. K., Holwill, M., Kumar, R. Krishna, Mishchenko, A., Novoselov, K. S., Ponomarenko, L. A., Taniguchi, T., Wallbank, J. R., Wang, Z., Watanabe, K.   +13 more
core   +2 more sources

Opportunities of Semiconducting Oxide Nanostructures as Advanced Luminescent Materials in Photonics

Advanced Materials, EarlyView.
The review discusses the challenges of wide and ultrawide bandgap semiconducting oxides as a suitable material platform for photonics. They offer great versatility in terms of tuning microstructure, native defects, doping, anisotropy, and micro‐ and nano‐structuring. The review focuses on their light emission, light‐confinement in optical cavities, and
Ana Cremades, Pedro Hidalgo, David Maestre, Ruth Martínez‐Casado, Emilio Nogales, Beatriz Rodríguez, G. Cristian Vásquez, Bianchi Méndez   +7 more
wiley   +1 more source

Moiré superlattices in strained graphene-gold hybrid nanostructures [PDF]

, 2016
Graphene-metal nanoparticle hybrid materials potentially display not only the unique properties of metal nanoparticles and those of graphene, but also additional novel properties due to the interaction between graphene and nanoparticles. This study shows
Biró, László Péter, Hwang, Chanyong, Molnár, György, Osváth, Zoltán, Pálinkás, András, Szendrő, Márton, Süle, Péter   +6 more
core   +2 more sources

2D Nanomaterials Toward Function‐Ready Superlubricity in Advanced Microsystems

Advanced Materials, EarlyView.
A unified framework links structural and transformation superlubricity with microsystem functions and deployment requirements. Mechanisms, device architectures, integration strategies, AI‐guided discovery, and benchmarking protocols are connected to define function‐ready superlubricity in advanced microsystems.
Yushan Geng, Jun Yang, Yong Yang
wiley   +1 more source

Bulk valley transport and Berry curvature spreading at the edge of flat bands

, 2020
2D materials based superlattices have emerged as a promising platform to modulate band structure and its symmetries. In particular, moir\'e periodicity in twisted graphene systems produces flat Chern bands. The recent observation of anomalous Hall effect
Adak, Pratap Chandra, Chittari, Bheema Lingam, Deshmukh, Mandar M., Jung, Jeil, Kanthi, R. S. Surya, Sangani, L. D. Varma, Sinha, Subhajit, Taniguchi, Takashi, Watanabe, Kenji   +8 more
core   +1 more source

Displacive In‐Plane Ferroelectricity with Domain‐Specific Curie Temperature in Van der Waals Semiconductors

Advanced Science, EarlyView.
Temperature‐dependent electron diffraction on tin monochalcogenides demonstrates a gradual displacive transformation between ferroelectric and paraelectric phases with significant variability in lattice constants and Curie temperature (TC). Periodic variations exist even between domains in individual crystals, implying a domain‐specific Curie ...
Peter Sutter, Eli Sutter
wiley   +1 more source