Review
Chemistry, Multidisciplinary
Min Sup Choi, Nasir Ali, Tien Dat Ngo, Hyungyu Choi, Byungdu Oh, Heejun Yang, Won Jong Yoo
Summary: Recent studies have focused on the potential use of 2D materials in future quantum devices. However, a major limitation occurs when 2D materials come into contact with metals, resulting in a decrease in electronic mobility. This article reviews the use of vdW-gap-free 1D edge contact as a solution to suppress carrier scattering and discusses its application in electronic, optoelectronic, and quantum devices. Challenges regarding the reliability of 1D contacts are also addressed.
ADVANCED MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Junwei Chu, Yang Wang, Xuepeng Wang, Kai Hu, Gaofeng Rao, Chuanhui Gong, Chunchun Wu, Hao Hong, Xianfu Wang, Kaihui Liu, Chunlei Gao, Jie Xiong
Summary: The emergence of 2D polarized materials has demonstrated unique quantum behaviors at atomic scales and their applications in information storage and processing have developed significantly in recent years. This review focuses on the basic 2D polarized materials system and their applications in spintronics, valleytronics, and electronics, highlighting the underlying physical mechanisms, symmetry broken theory, and modulation process through heterostructure engineering. These summarized works will continue to enrich the understanding of 2D quantum systems and promising practical applications.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Yang Pan, Dietrich R. T. Zahn
Summary: This research investigates the interlayer coupling in 2D transition metal dichalcogenides (TMDCs) through Raman, photoluminescence, and atomic force microscopy studies. The study found that the B-2g vibrational mode appears after strong coupling, acting as a Raman fingerprint of interlayer coupling in 2D TMDCs.
Article
Chemistry, Multidisciplinary
Kimmo Mustonen, Christoph Hofer, Peter Kotrusz, Alexander Markevich, Martin Hulman, Clemens Mangler, Toma Susi, Timothy J. Pennycook, Karol Hricovini, Christine Richter, Jannik C. Meyer, Jani Kotakoski, Viera Skakalova
Summary: Researchers have successfully stabilized a 2D structure composed of copper and iodine at room temperature by using graphene oxide as the template material, providing a new method for producing more exotic phases of materials for experiments.
ADVANCED MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Mirko Poljak, Mislav Matic, Ante Zeljko
Summary: Atomistic quantum transport device simulations were used to investigate the contact resistance in monoelemental 2D material nanoribbon MOSFETs with edge contacts. The study found that using moderately interacting metallic materials minimized RC, with the lowest RC values being around 150-430 Omega . mu m in graphene, silicene, germanene, and phosphorene nanodevices.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Chemistry, Physical
Shijian Wang, Sai Zhao, Xin Guo, Guoxiu Wang
Summary: 2D materials are considered promising electrode materials for rechargeable batteries due to their advantages in active sites and reaction kinetics. Challenges remain for these materials to meet all requirements for high-performance energy storage devices. Recent advances in 2D material-based heterostructures offer opportunities for enhanced performance.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Shuchen Zhang, Zih-Yu Lin, Enzheng Shi, Blake P. Finkenauer, Yao Gao, Alan J. Pistone, Ke Ma, Brett M. Savoie, Letian Dou
Summary: This study quantitatively investigates in-plane thermally driven anionic inter-diffusion in a series of novel 2D and quasi-2D halide perovskites lateral heterostructures, revealing that bulky pi-conjugated organic cations inhibit Br-I inter-diffusion and halide diffusion is faster in quasi-2D structures compared to 2D structures. Molecular dynamics simulations provide insights into mechanisms for suppressing diffusion.
ADVANCED MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Suman Jaiswal, Parvin Fathi-Hafshejani, Baha Yakupoglu, Matthew G. Boebinger, Nurul Azam, Raymond R. Unocic, Michael C. Hamilton, Masoud Mahjouri-Samani
Summary: This study demonstrates a method for wafer-scale synthesis of 2D materials on silicon substrates. It utilizes a room-temperature deposition and formation of amorphous precursors, followed by a post-deposition crystallization process. This method allows for large-scale synthesis of crystalline 2D materials, which is crucial for future wafer-scale electronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Peiyu Qiao, Jing Xia, Xuanze Li, Yuye Li, Jianyu Cao, Zhongshi Zhang, Heng Lu, Qing Meng, Jiangtao Li, Xiang-Min Meng
Summary: In this study, a two-step chemical vapor deposition (CVD) growth method was used to prepare 2D TaSe2-WSe2 metal-semiconductor heterostructures. The results show that these heterostructures can improve the performance of electrical devices and have potential applications in future high-performance integrated circuits.
Review
Chemistry, Multidisciplinary
Hui-Lei Hou, Cosimo Anichini, Paolo Samori, Alejandro Criado, Maurizio Prato
Summary: In the past 15 years, 2D materials have revolutionized materials science and become powerful components for high-performance chemical sensors. By forming van der Waals heterostructures (VDWHs), the individual drawbacks of 2D materials can be overcome, leading to superior sensitivities, selectivity, and stability. This review discusses the latest developments in chemical sensors based on VDWHs of 2D materials, including sensing mechanisms and future directions with potential impact in environmental sciences and biomedical applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Andrea Balocchi, Lucianna Da Gama Fernandes Vieira, Giovanna Formiga Franklin, Pierre-Louis Taberna, Antoine Barnabe, Marc Vedrenne, Xavier Marie, Sefaattin Tongay, Jean Yves Chane-Ching
Summary: Large-surface-area, nanostructured films composed of 2D TMDCs building blocks were self-assembled using a customized metallic sulfide template. Control of 2D/2D contact properties in these films was explored through variations in building block sizes and film-forming processes. The study revealed that the surface area, density, and boundary angles of 2D/2D contacts are key parameters controlling the recombination of photogenerated carriers.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Louis Donald Notemgnou Mouafo, Florian Godel, Laurent Simon, Yannick J. Dappe, Walid Baaziz, Ulrich Nguetchuissi Noumbe, Etienne Lorchat, Marie-Blandine Martin, Stephane Berciaud, Bernard Doudin, Ovidiu Ersen, Bruno Dlubak, Pierre Seneor, Jean-Francois Dayen
Summary: This study presents a novel single electron transistor (SET) design using 2D materials and 0D nanoclusters, unveiling the concept of 0D-2D vertical SET. By combining the large Coulomb energy of nanoclusters with the electronic capabilities of 2D layer, efficient electric back gate control of nanocluster charge state is achieved.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jaehyung Yu, Edmund Han, M. Abir Hossain, Kenji Watanabe, Takashi Taniguchi, Elif Ertekin, Arend M. van der Zande, Pinshane Y. Huang
Summary: By introducing low-friction twisted or heterointerfaces, the bending stiffness of 2D heterostructures can be tailored, making them more deformable than conventional thin-film electronic devices. Research shows that when each atomic layer is separated by heterointerfaces, the total bending stiffness reaches a theoretical minimum, transferring the extreme deformability of 2D monolayers to device-compatible multilayers.
ADVANCED MATERIALS
(2021)
Review
Chemistry, Physical
Junkai Ren, Plinio Innocenzi
Summary: Hexagonal boron nitride (h-BN) is a highly attractive 2D material due to its remarkable properties, and its combination with other components to form heterostructures shows great potential for developing advanced functional devices. High-quality 2D h-BN structures with fewer defects can maximize its intrinsic properties, while controlled introduction of multiple defects in 2D h-BN can create new properties and advanced functions. Engineering of heterojunctions, including interface bonding design, plays a crucial role in developing advanced applications based on h-BN heterostructures in the future.
Review
Chemistry, Multidisciplinary
Qianying Tang, Fang Zhong, Qing Li, Jialu Weng, Junzhe Li, Hangyu Lu, Haitao Wu, Shuning Liu, Jiacheng Wang, Ke Deng, Yunlong Xiao, Zhen Wang, Ting He
Summary: An infrared photodetector serves as a critical component in various fields such as national defense, military, communications, and astronomy. The emergence of 2D materials offers new possibilities for developing next-generation infrared detectors, but challenges such as thickness limitations and immature preparation techniques still exist.
Article
Nanoscience & Nanotechnology
Aditya Sood, Jonah B. Haber, Johan Carlstrom, Elizabeth A. Peterson, Elyse Barre, Johnathan D. Georgaras, Alexander H. M. Reid, Xiaozhe Shen, Marc E. Zajac, Emma C. Regan, Jie Yang, Takashi Taniguchi, Kenji Watanabe, Feng Wang, Xijie Wang, Jeffrey B. Neaton, Tony F. Heinz, Aaron M. Lindenberg, Felipe H. da Jornada, Archana Raja
Summary: In this study, lattice dynamics in photoexcited WSe2/WS2 heterostructures were directly visualized using femtosecond electron diffraction. It was found that both WSe2 and WS2 were heated simultaneously on a picosecond timescale, which cannot be explained by phonon transport across the interface. First-principles calculations revealed a fast channel involving layer-hybridized electronic states, enabling phonon-assisted interlayer transfer of photoexcited electrons. Phonons were emitted in both layers on the femtosecond timescale via this channel, consistent with the simultaneous lattice heating observed experimentally. Strong electron-phonon coupling via layer-hybridized electronic states was identified as a novel route for controlling energy transport across atomic junctions.
NATURE NANOTECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Jonas D. D. Ziegler, Yeongsu Cho, Sophia Terres, Matan Menahem, Takashi Taniguchi, Kenji Watanabe, Omer Yaffe, Timothy C. C. Berkelbach, Alexey Chernikov
Summary: 2D hybrid perovskites have attracted significant attention in material research for light-harvesting and -emitting applications. In this study, a method of interfacing ultrathin sheets of perovskites with few-layer graphene and hexagonal boron nitride is demonstrated, enabling gate-tunable control of light emission and absorption. The findings reveal the emergence of both negatively and positively charged excitons, with high binding energies and excellent mobility. This research introduces the physics of interacting mixtures of optical and electrical excitations to the broad family of 2D inorganic-organic nanostructures, highlighting the potential of 2D perovskites as a promising material platform for electrically modulated light-emitters and exciton transistors.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Minwook Kim, Yeonjae Lee, Sunil Kumar, Dongwoon Kang, Sohee Lee, Van Huy Nguyen, Dinh Cong Nguyen, Syed Hassan Abbas Jaffery, Jongwan Jung, Takashi Taniguchi, Kenji Watanabe, Yongho Seo
Summary: In recent years, there has been extensive research on 2D materials-based heterostructures for fabricating nanodevices. Transition metal dichalcogenides (TMDC), hexagonal boron nitride (hBN), and graphene (Gr) are commonly used materials in these devices. Optoelectronic memory devices based on 2D materials are of particular interest due to their structural flexibility and small device size. This study focuses on the fabrication of a non-volatile optoelectronic memory device using tungsten diselenide (WSe2) and hBN-encapsulated Gr-based heterostructures. The device can be easily controlled by both UV light and an electric field.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Valerie Hsieh, Dorri Halbertal, Nathan R. . Finney, Ziyan Zhu, Eli Gerber, Michele Pizzochero, Emine Kucukbenli, Gabriel R. Schleder, Mattia Angeli, Kenji Watanabe, Takashi Taniguchi, Eun-Ah Kim, Efthimios Kaxiras, James Hone, Cory R. Dean, D. N. Basov
Summary: Twisted van der Waals multilayers are regarded as a rich platform for accessing novel electronic phases. This study proposes that naturally formed stacking domains due to relative twist between layers can act as an additional control knob. The researchers observe selective adhesion of metallic nanoparticles and liquid water at domains with specific stacking configurations and demonstrate the manipulation of nanoparticles can locally reconfigure the moire superlattice.
Article
Chemistry, Multidisciplinary
Yu-Chiang Hsieh, Zhen-You Lin, Shin-Ji Fung, Wen-Shin Lu, Sheng-Chin Ho, Siang-Ping Hong, Sheng-Zhu Ho, Chiu-Hua Huang, Kenji Watanabe, Takashi Taniguchi, Yang-Hao Chan, Yi-Chun Chen, Chung-Lin Wu, Tse-Ming Chen
Summary: By creating atomically flat surface nanostructures in hexagonal boron nitride, we achieve an arbitrary on-chip control of both the strain distribution and magnitude on high-quality molybdenum disulfide. The phonon and exciton emissions vary according to our strain field designs, enabling us to write and draw any photoluminescence color image in a single chip. Our strain engineering also offers a powerful means to alter the strengths and energies of interlayer excitons at room temperature, promising for functional excitonic devices.
Article
Chemistry, Physical
Benjamin A. Foutty, Jiachen Yu, Trithep Devakul, Carlos R. Kometter, Yang Zhang, Kenji Watanabe, Takashi Taniguchi, Liang Fu, Benjamin E. Feldman
Summary: By studying twisted double-bilayer WSe2, we have identified charge-ordered phases at multiple integer and fractional moire fillings. Through experiments with magnetic fields and displacement fields, we have observed spin-polarized ground states and a metal-insulator transition. These results demonstrate the control over spin and valley character in this system.
Article
Multidisciplinary Sciences
Kaining Yang, Xiang Gao, Yaning Wang, Tongyao Zhang, Yuchen Gao, Xin Lu, Shihao Zhang, Jianpeng Liu, Pingfan Gu, Zhaoping Luo, Runjie Zheng, Shimin Cao, Hanwen Wang, Xingdan Sun, Kenji Watanabe, Takashi Taniguchi, Xiuyan Li, Jing Zhang, Xi Dai, Jian-Hao Chen, Yu Ye, Zheng Han
Summary: The authors report the evidence of unconventional correlated insulating states in bilayer graphene/CrOCl heterostructures and demonstrate their application for low-temperature logic inverters. They investigate the heterostructures based on Bernal-stacked bilayer graphene atop few-layered CrOCl, which exhibit an over-1-G omega-resistance insulating state in a widely accessible gate voltage range. By applying an in-plane electric field, heating, or gating, the insulating state can be switched into a metallic state with an on/off ratio up to 10(7).
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Salvatore Cianci, Elena Blundo, Federico Tuzi, Giorgio Pettinari, Katarzyna Olkowska-Pucko, Eirini Parmenopoulou, Djero B. L. Peeters, Antonio Miriametro, Takashi Taniguchi, Kenji Watanabe, Adam Babinski, Maciej R. Molas, Marco Felici, Antonio Polimeni
Summary: This paper reports the formation of regular arrays of strained hydrogen-filled one-layer-thick micro-domes by H-ion irradiation and lithography-based approaches. By depositing thin hBN flakes on the domes, the dome structure can be preserved, leading to the appearance of intense emission lines from localized excitons, which behave as quantum emitters.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Michael D. Randle, Masayuki Hosoda, Russell S. Deacon, Manabu Ohtomo, Patrick Zellekens, Kenji Watanabe, Takashi Taniguchi, Shota Okazaki, Takao Sasagawa, Kenichi Kawaguchi, Shintaro Sato, Koji Ishibashi
Summary: Systems combining superconductors with topological insulators provide a platform for studying Majorana bound states and realizing fault tolerant topological quantum computation. Monolayers of WTe2 possess rare properties, such as being a quantum spin Hall insulator and easily transitioning into a superconducting state. Measurements on gate-defined Josephson weak-link devices made from monolayer WTe2 demonstrate the critical role of 2D superconducting leads in interpreting magnetic interference in the resulting junctions. The reported fabrication procedures offer a straightforward means of producing more devices from this technically challenging material and mark the first step towards versatile all-in-one topological Josephson weak-links using monolayer WTe2.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Rafael Battistella Nadas, Andreij C. Gadelha, Tiago C. Barbosa, Cassiano Rabelo, Thiago de Lourenco e Vasconcelos, Vitor Monken, Ary V. R. Portes, Kenji Watanabe, Takashi Taniguchi, Jhonattan C. Ramirez, Leonardo C. Campos, Riichiro Saito, Luiz Gustavo Cancado, Ado Jorio
Summary: The coherence length (L(c)) of the Raman scattering process in graphene, as determined by spatially coherent tip-enhanced Raman spectroscopy, decreases when the Fermi energy is brought to the neutrality point. This observation is consistent with the concept of the Kohn anomaly within a ballistic transport regime. The observed results can be attributed to either an unusually large variation in the longitudinal optical phonon group velocity (v(g)), which reaches twice the value of the longitudinal acoustic phonon, or changes in the electron energy uncertainty. These properties are important for understanding optical and transport phenomena that may not be observable with other techniques.
Editorial Material
Multidisciplinary Sciences
Qian Song, Connor A. Occhialini, Emre Ergecen, Batyr Ilyas, Danila Amoroso, Paolo Barone, Jesse Kapeghian, Kenji Watanabe, Takashi Taniguchi, Antia S. Botana, Silvia Picozzi, Nuh Gedik, Riccardo Comin
Article
Optics
Tianqi Liu, Qiang Fu, Yuanzhe Li, Xu Han, Shixuan Wang, Takashi Taniguchi, Kenji Watanabe, Dongyang Wan, Qi Zhang, Yingbo Zhao, Zhenhua Ni, Fei Ding, Zhenliang Hu, Xueyong Yuan, Junpen Lu
Summary: In this study, the brightness of WS2-based LEDs is enhanced by introducing self-assembled silver nanoparticles (NPs) on top of the LED. With the assistance of effective transient-mode charge injection, a 2.9-fold electroluminescence (EL) enhancement is observed in the experiment. Full-wave simulations confirm that the improvement comes from the scattering capability of silver NPs.
Article
Optics
Garima Gupta, Kenji Watanabe, Takashi Taniguchi, Kausik Majumdar
Summary: In monolayer transition metal dichalcogenide semiconductors, valley coherence degrades rapidly due to scattering and inter-valley exchange interaction. However, by using a sandwich structure of monolayer MoS2 between top and bottom graphene, fully valley-coherent excitons with high degree of linear polarization are achieved. This is attributed to the suppression in exchange interaction, reduction in exciton lifetime, and operating in the motional narrowing regime.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Shaochun Zhang, Mina Maruyama, Susumu Okada, Mengsong Xue, Kenji Watanabe, Takashi Taniguchi, Kazuki Hashimoto, Yasumitsu Miyata, Ruben Canton-Vitoria, Ryo Kitaura
Summary: This study reports the observation of the photovoltaic effect in a WS2/MoS2 van der Waals heterostructure. Light excitation of WS2/MoS2 at a wavelength of 633 nm leads to a photocurrent without applying bias voltages.
Article
Chemistry, Multidisciplinary
Aparna Parappurath, Bhaskar Ghawri, Saisab Bhowmik, Arup Singha, K. Watanabe, T. Taniguchi, Arindam Ghosh
Summary: The ability to tune the twist angle between different layers of 2D materials has led to the creation of electronic flat bands artificially. In this study, the photoresponse of a few-layer WSe2/tBLG heterostructure was measured, and it was found that the photoresponse is sensitive to the band structure of tBLG. When the Fermi energy is within the low-energy moiré bands, the photoresponse is strongly suppressed, but it can be recovered when the Fermi energy exceeds the moiré band edge due to the photogating effect.