Article
Chemistry, Multidisciplinary
Haonan Ling, Jacob B. Khurgin, Artur R. Davoyan
Summary: Layered van der Waals materials provide unique atomic-void channels with subnanometer dimensions, offering opportunities for advanced applications such as sensing and quantum information. Theoretical limits of light guiding in these channels show that materials with strong resonances, excitonic and polaritonic properties are ideal for deeply subwavelength light guiding. Transition metal dichalcogenides with excitonic properties can concentrate over 70% of optical power within them.
Article
Chemistry, Multidisciplinary
Kwanghee Cho, Seungyeol Lee, Raju Kalaivanan, Raman Sankar, Kwang-Yong Choi, Soonyong Park
Summary: By incorporating magnetic ions into the ferroelectric framework of antiferroelectric CuCrP2S6, a tunable local ferroelectric state is observed, which is important for realizing multiferroicity and magnetoelectric coupling in layered van der Waals materials.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Hugh Ramsden, Soumya Sarkar, Yan Wang, Yiru Zhu, James Kerfoot, Evgeny M. Alexeev, Takashi Taniguchi, Kenji Watanabe, Sefaattin Tongay, Andrea C. Ferrari, Manish Chhowalla
Summary: van der Waals heterostructures (vdW-HSs) integrate dissimilar materials to form complex devices, relying on the manipulation of charges at multiple interfaces. Conductive mode and cathodoluminescence scanning electron microscopy (CM-SEM and SEM-CL) were used to investigate the trapping of charges in vdW-HSs during electron irradiation, which can adversely affect the performance of the devices. The results showed that up to 70% of beam electrons are deposited into the vdW-HS, leading to dynamic doping of 1L-WSe2 and reducing its cathodoluminescence efficiency. CM-SEM and SEM-CL provide a toolkit for nanoscale characterization of vdW-HS devices, allowing for the correlation of electrical and optical properties.
Article
Chemistry, Multidisciplinary
Yurong Su, Xinlu Li, Meng Zhu, Jia Zhang, Long You, Evgeny Y. Tsymbal
Summary: This study investigates the spin-dependent transport properties of van der Waals multiferroic tunnel junctions (MFTJs) composed of 2D ferromagnetic FemGeTe2 electrodes and 2D ferroelectric In2Se3 barrier layers. The proposed vdW MFTJs demonstrate multiple nonvolatile resistance states associated with the polarization orientation of the ferroelectric layer and magnetization alignment of the ferromagnetic layers, with a remarkably low resistance-area product making them promising for nonvolatile memory applications.
Article
Chemistry, Multidisciplinary
Do-Hyeon Lee, Viet Dongquoc, Seongin Hong, Seung-Il Kim, Eunjeong Kim, Su-yeon Cho, Chang-Hwan Oh, Yeonjin Je, Mi Ji Kwon, Anh Hoang Vo, Dong-Bum Seo, Jae Hyun Lee, Sunkook Kim, Eui-Tae Kim, Jun Hong Park
Summary: This study demonstrates the van der Waals passivation of transition metal dichalcogenides (TMDCs) through the stacking of hydrocarbon (HC) dielectrics, which enhances the electrical performance and stability of the device while suppressing chemical disorder at the interface.
Article
Chemistry, Multidisciplinary
Carla Boix-Constant, Samuel Manas-Valero, Rosa Cordoba, Jose J. Baldovi, Angel Rubio, Eugenio Coronado
Summary: Layered materials, such as 1T-TaS2, are excellent for studying the interplay between in-plane and out-of-plane entanglement in strongly correlated systems. Experimental findings supported by DFT+U calculations reveal dimensionality as a key factor in understanding quantum materials like 1T-TaS2. The presence of an energy gap in the few-layer limit highlights the possible experimental realization of low-dimensional quantum spin liquid states.
Article
Chemistry, Multidisciplinary
Sikang Zheng, Jingwei Li, Daliang Zhang, Zizhen Zhou, Jie Liu, Yanyan Tao, Xuan Fang, Xiaolong Yang, Guang Han, Xu Lu, Guoyu Wang, Bin Zhang, Dengkui Wang, Xiaoyuan Zhou
Summary: This study intensively investigates the oxidation behavior and surface structure evolution of van der Waals chalcogenide GaSe. The temperature-dependent oxidation behavior and surface structure evolution are revealed, and the potential for surface oxidation engineering is explored. This research is of great significance for deep understanding and utilization of oxidation behavior, as well as for materials/device design and development of relative systems.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jingfeng Li, Sadhu Kolekar, Mahdi Ghorbani-Asl, Tibor Lehnert, Johannes Biskupek, Ute Kaiser, Arkady Krasheninnikov, Matthias Batzill
Summary: The electronic properties of platinum dichalcogenides can be tuned by controlling the number of layers, with monolayer PtSe2 and PtTe2 exhibiting band gaps of 1.8 and 0.6 eV, respectively. Experimental data compared to DFT calculations show the sensitivity of the band gap to interlayer separation, indicating the potential for gap tuning using stress. Additionally, modest pressures can significantly reduce the gap in Pt dichalcogenides, making them suitable for pressure sensing applications.
Review
Optics
Christopher Gies, Alexander Steinhoff
Summary: 2D semiconductors and their heterostructures have become a flourishing research field, with experimental and theoretical developments progressing simultaneously and benefiting from each other. Theoretical advancements focus on exciton-plasma balance, excited-state optics, and laser physics.
LASER & PHOTONICS REVIEWS
(2021)
Review
Chemistry, Multidisciplinary
Tianping Ying, Tongxu Yu, Yanpeng Qi, Xiaolong Chen, Hideo Hosono
Summary: By breaking traditional alloying strategy restrictions, the high entropy concept has expanded the field of alloy exploitation. This review focuses on the combination of the high entropy concept and van der Waals systems to create a new category of materials called high entropy van der Waals materials (HEX). The design strategy for HEX incorporates the local features of high entropy materials and the holistic degrees of freedom in van der Waals materials, successfully leading to the discovery of various high entropy compounds with desirable physical properties. Additionally, deliberate design of structural units and their stacking configuration in HEX can also enhance catalytic performance.
Review
Materials Science, Multidisciplinary
Sidi Fan, Rui Cao, Lude Wang, Shan Gao, Yupeng Zhang, Xiang Yu, Han Zhang
Summary: Quantum tunneling with band-structure engineering has been successfully developed for applications in electrical, optoelectrical, and magnetic devices. Devices based on 2D van der Waals heterostructures offer superior tunneling performance and scaling down device size. The research on 2D tunneling devices is in its early stages, but they are expected to emerge as competitive candidates for low-power and high-speed devices.
SCIENCE CHINA-MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Wenkai Zhu, Hailong Lin, Faguang Yan, Ce Hu, Ziao Wang, Lixia Zhao, Yongcheng Deng, Zakhar R. Kudrynskyi, Tong Zhou, Zakhar D. Kovalyuk, Yuanhui Zheng, Amalia Patane, Igor Zutic, Shushen Li, Houzhi Zheng, Kaiyou Wang
Summary: This study reports all-2D van der Waals vertical spin-valve devices with two distinct transport behaviors and reveals the critical role of pinholes in the magnetoresistance of such devices.
ADVANCED MATERIALS
(2021)
Article
Mechanics
Hiroyuki Hirakata, Masao Akiyoshi, Ryoichi Masuda, Takahiro Shimada
Summary: In this study, it was demonstrated that van der Waals-layered MoTe2, with its closely laminated two-dimensional atomic layers through weak interactions, exhibits higher fracture toughness in out-of-plane cracks compared to in-plane cracks due to structural anisotropy. In situ electron microscopy fracture toughness tests showed that the apparent fracture toughness of the out-of-plane crack was approximately twice that of the in-plane crack based on the continuum assumption. As loading progressed in the out-of-plane crack specimen, inter-laminar slip occurred between the layers, and this discrete nature resulted in the disappearance of stress singularity, leading to high fracture toughness.
ENGINEERING FRACTURE MECHANICS
(2023)
Review
Chemistry, Multidisciplinary
Wei Tang, Haoliang Liu, Zhe Li, Anlian Pan, Yu-Jia Zeng
Summary: Spin-orbit torque (SOT) plays a crucial role in the electrical manipulation of magnetization in spintronic devices, with van der Waals-layered materials showing promising properties for efficient SOT applications. By converting charge current into spin current, these materials can effectively control magnetization.
Article
Chemistry, Multidisciplinary
Andrey Yu Klokov, Nikolay Yu Frolov, Andrey Sharkov, Sergey N. Nikolaev, Maxim A. Chernopitssky, Semen Chentsov, Mikhail Pugachev, Aliaksandr Duleba, Alexey Shupletsov, Vladimir S. Krivobok, Aleksandr Yu Kuntsevich
Summary: This study explores the mechanical properties of layered crystals in the few layer limit using picosecond ultrasonic technique. By measuring the temporal variation of the reflection coefficient of an Al film covering heterostructures, the mechanical parameters and rigidity of the interfaces can be evaluated. The results demonstrate the potential of van der Waals heterostructures for nanoacoustical applications.
Article
Materials Science, Multidisciplinary
Geovani C. Resende, Guilherme A. S. Ribeiro, Orlando J. Silveira, Jessica S. Lemos, Juliana C. Brant, Daniel Rhodes, Luis Balicas, Mauricio Terrones, Mario S. C. Mazzoni, Cristiano Fantini, Bruno R. Carvalho, Marcos A. Pimenta
Summary: In this study, angle-dependent polarized Raman spectroscopy was used to investigate a single-layer triclinic ReSe2, revealing the physical origin of the complex nature of the Raman tensor elements through a new coordinate system. This understanding contributes to the development of new optoelectronic devices based on low-symmetry 2D materials by exploring electron-phonon coupling anisotropy.
Article
Chemistry, Multidisciplinary
Chen Shen, Shiheng Lu, Zhenhua Tian, Shujie Yang, Jorge A. Cardenas, Junfei Li, Xiuyuan Peng, Tony Jun Huang, Aaron D. Franklin, Steven A. Cummer
Summary: A structure featuring a thin-film transistor configuration is proposed to achieve electrically tunable SAW propagation based on conductivity tuning. The use of carbon nanotubes and crystalline nanocellulose as the channel and gate materials results in high tuning capacity and low gate voltage requirement. The proposed device exhibits a 2.5% phase velocity tuning and near 10 dB on/off switching of the signals.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Physics, Applied
Yuh-Chen Lin, G. Bruce Rayner, Jorge Cardenas, Aaron D. Franklin
Summary: In this study, NC-FETs based on 2D MoS2 using CMOS-compatible ferroelectric HfZrO2 were experimentally studied, showing significant improvement in subthreshold switching at shorter channel lengths, down to 20 nm. The analysis of the capacitive network indicated that the NC effect is enhanced by a larger magnitude of polarization in the ferroelectric, benefiting gate control and channel-length scaling.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Aikaterini Flessa Savvidou, Judith K. Clark, Hua Wang, Kaya Wei, Eun Sang Choi, Shirin Mozaffari, Xiaofeng Qian, Michael Shatruk, Luis Balicas
Summary: The novel compound Rh3In3.4Ge3.6, synthesized via an indium flux method, belongs to the cubic Ir3Ge7 structure type and shows potential as a thermoelectric material. However, its modest figure of merit is attributed to the lack of a finite band gap, indicating that improvement could be achieved through chemical substitution strategies.
CHEMISTRY OF MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Jorge A. Cardenas, Shiheng Lu, Nicholas X. Williams, James L. Doherty, Aaron D. Franklin
Summary: This study demonstrates a simple and rapid 4-step in-place printing procedure for producing low-voltage electrolyte-gated carbon nanotube thin-film transistors, with optimized performance achieved by rinsing CNT films and printing an ion gel in-place using an elevated platen temperature. Devices showed exceptional flexibility and electrochemical stability under mechanical strain and long-term bias tests, suggesting new avenues for improving bias stress stability in electrolyte-gated transistors.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Physics, Multidisciplinary
J. Dai, E. Frantzeskakis, N. Aryal, K-W Chen, F. Fortuna, J. E. Rault, P. Le Fevre, L. Balicas, K. Miyamoto, T. Okuda, E. Manousakis, R. E. Baumbach, A. F. Santander-Syro
Summary: We report the observation of a nontrivial spin texture in Dirac node arcs, which are novel topological objects formed when Dirac cones of massless particles extend along an open one-dimensional line in momentum space. These states are present in all compounds of the tetradymite M2Te2X family, regardless of the strength of the topological invariant. Thus, the Dirac node arcs in tetradymites represent the simplest type-I Dirac system with a single spin-polarized node arc.
PHYSICAL REVIEW LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Nicholas X. Williams, George Bullard, Nathaniel Brooke, Michael J. Therien, Aaron D. Franklin
Summary: This study presents the use of all-carbon thin-film transistors, printed on paper substrates and the constituent materials subsequently recycled, achieving stable performance outcomes.
NATURE ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Hattan Abuzaid, Zhihui Cheng, Guoqing Li, Linyou Cao, Aaron D. Franklin
Summary: Creating metal edge contacts in WSe2 and WS2 transistors produced unexpected results, with a polarity shift observed in Ti-WS2 devices and comparable p-branch-dominant performance in WSe2 using three different metal contact materials. The presence of a residual layer of W beneath the metal contacts, even after substrate over-etching, suggests significant implications for the design of tungsten-based, edge-contacted TMD transistors.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Shulin Ye, Nicholas X. Williams, Aaron D. Franklin
Summary: This study demonstrates the printing of SU-8 with an aerosol jet printer as a viable passivation layer for conductive silver lines in ionic solutions. Extending the SU-8 film beyond the electrodes significantly reduced leakage current and improved stability. This research provides useful progress towards fully printed, stable electronic biosensing devices.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Multidisciplinary Sciences
Dan Sun, Vasily S. Minkov, Shirin Mozaffari, Ying Sun, Yanming Ma, Stella Chariton, Vitali B. Prakapenka, Mikhail Eremets, Luis Balicas, Fedor F. Balakirev
Summary: The superconductivity of LaH10 is found to be influenced by pressure and magnetic field, with lattice vibrations strongly affecting the superconducting coupling. This has important implications for understanding the superconductivity of metallic hydrogen.
NATURE COMMUNICATIONS
(2021)
Review
Engineering, Electrical & Electronic
Saptarshi Das, Amritanand Sebastian, Eric Pop, Connor J. McClellan, Aaron D. Franklin, Tibor Grasser, Theresia Knobloch, Yury Illarionov, Ashish V. Penumatcha, Joerg Appenzeller, Zhihong Chen, Wenjuan Zhu, Inge Asselberghs, Lain-Jong Li, Uygar E. Avci, Navakanta Bhat, Thomas D. Anthopoulos, Rajendra Singh
Summary: This paper examines the development of field-effect transistors based on two-dimensional materials for VLSI technology, highlighting the challenges that need to be addressed such as reducing contact resistance, stable doping schemes, mobility engineering, and high-k dielectric integration. The review emphasizes the importance of large-area growth of uniform 2D layers in ensuring low defect density and clean interfaces. Furthermore, potential applications of 2D transistors in various futuristic technologies are discussed.
NATURE ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
M. Cabrera-Baez, K. V. R. A. Silva, P. R. T. Ribeiro, D. R. Ratkovski, E. L. T. Franca, A. Flessa-Savvidou, B. Casas, T. Siegrist, L. Balicas, S. M. Rezende, F. L. A. Machado
Summary: In this study, the magnetotransport properties of the nonmagnetic compound YCd6 were investigated under applied magnetic fields and low temperatures. The results revealed giant magnetoresistance, which can be explained by field-induced pseudogaps on the Fermi surface. These findings are relevant for understanding the Fermi-surface topology of quasicrystal approximants.
Article
Materials Science, Multidisciplinary
Aikaterini Flessa Savvidou, Andrzej Ptok, G. Sharma, Brian Casas, Judith K. Clark, Victoria M. Li, Michael Shatruk, Sumanta Tewari, Luis Balicas
Summary: We report a transport study on Pd3In7, which exhibits multiple Dirac type-II nodes in its electronic dispersion. We find anomalous longitudinal magnetoresistivity (LMR) consistent with predictions for type-II Weyl semimetals, as well as large and positive transverse magnetoresistivity (CMR) following an anomalous, angle-dependent power law. The behavior of LMR deviates from chiral-anomaly driven LMR in Weyl semimetals, indicating a different mechanism at play.
NPJ QUANTUM MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
D. Shcherbakov, Jiawei Yang, Shahriar Memaran, Kenji Watanabe, Takashi Taniguchi, Dmitry Smirnov, Luis Balicas, Chun Ning Lau
Summary: We perform magnetotransport studies on atomically thin InSe field-effect transistors with large Rashba spin-orbit coupling. We extract the Landau level gaps through thermal activation measurements and find that the gaps at even and odd filling factors have positive and negative intercepts at B = 0, respectively, due to spin-split Landau spectrum. We also demonstrate that for materials with strong spin-orbit coupling, the Landau level gaps may vary nonlinearly and nonmonotonically with magnetic field, making the extraction of effective mass and g-factor sensitive to the strength and tunability of SOC.
Article
Materials Science, Multidisciplinary
I. F. Gilmutdinov, R. Schonemann, D. Vignolles, C. Proust, I. R. Mukhamedshin, L. Balicas, H. Alloul
Summary: The research focuses on the electronic topology in metallic kagome compounds, presenting transport experiments in Na2/3CoO2 which show evidence for the coexistence of light and heavy carriers. At low temperatures, the dominant light carrier conductivity is suppressed by B-linear MR, suggesting the presence of Dirac-like quasiparticles.