Article
Chemistry, Multidisciplinary
Junxiong Hu, Yulei Han, Xiao Chi, Ganesh Ji Omar, Mohammed Mohammed Esmail Al Ezzi, Jian Gou, Xiaojiang Yu, Rusydi Andrivo, Kenji Watanabe, Takashi Taniguchi, Andrew Thye Shen Wee, Zhenhua Qiao, A. Ariando
Summary: This work demonstrates the emergence of robust spin-polarization in graphene on a ferrimagnetic insulating oxide Tm3Fe5O12 (TmIG) with large spin-splitting energy of up to hundreds of meV. Moreover, the induced spin-splitting energy can be tuned over a broad range by field cooling technique. The observed spin polarization in graphene with large and tunable spin-splitting energy promises the field of 2D spintronics.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Dongwon Shin, Hyeonbeom Kim, Sung Ju Hong, Sehwan Song, Yeongju Choi, Youngkuk Kim, Sungkyun Park, Dongseok Suh, Woo Seok Choi
Summary: Graphene and LaCoO3 hybrid heterostructure exhibits electrically tunable spin-exchange splitting, providing an opportunity for spin polarization control in spintronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xian Wang, Yingqi Cui, Li Zhang, Mingli Yang
Summary: The study demonstrates the tunable interlayer conductance of graphene by vertical electric field, controlled by interlayer stacking, distance, disc size, and field strength. Analysis of polarizability decomposition scheme reveals the significant role of the middle layer in shielding and promoting interlayer electron flow, with effects varying with twist angle and disc size.
Article
Chemistry, Multidisciplinary
Haozhe Yang, Maider Ormaza, Zhendong Chi, Eoin Dolan, Josep Ingla-Aynes, C. K. . Safeer, Franz Herling, Nerea Ontoso, Marco Gobbi, Beatriz Martin-Garcia, Frederik Schiller, Luis E. Hueso, Felix Casanova
Summary: The spin Hall effect in graphene can be enhanced by decorating it with a light metal oxide, which overcomes the low spin-orbit coupling and retains a long spin diffusion length. The efficiency of this all-light-element heterostructure can be tuned by the Fermi level position and exhibits a maximum around the charge neutrality point. It shows a higher efficiency compared to conventional spin Hall materials and can be controlled by gate voltage up to room temperature, offering a potential spin-to-charge conversion system free from heavy metals and compatible with large-scale fabrication.
Article
Multidisciplinary Sciences
Natalia Cortes, Oscar Negrete, Francisco J. Pena, Patricio Vargas
Summary: The electrocaloric effect in graphene structures can be influenced by external electric fields, with different stacking arrangements resulting in different thermal responses. In certain stacking configurations, both direct and inverse electrocaloric responses may occur within the same sample.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Ying Xu, You-Bo Ma, Feng Gu, Shan-Shan Yang, Chuan-Shan Tian
Summary: Graphitic electrode is widely used in electrochemical reactions due to its excellent in-plane conductivity, structural robustness and cost efficiency. Graphene, as a two-dimensional building block of graphite, shares similar chemical properties with graphite and offers more possibilities for developing advanced graphitic devices. This study demonstrates the minimal influence of extrinsic factors on the structural evolution at the graphene-water interface by using large-size suspended substrate-free monolayer graphene. The findings provide insights into the microscopic processes at graphitic-electrode interfaces.
Article
Optics
Menghui Fan, Yao Zhang, Deliang Chen, Lirong Ren, Qin Yang, Chaobiao Zhou
Summary: This paper numerically studies the light trapping and manipulation of an asymmetric graphene metasurface. The results show that the designed device has significant light field capture and regulation ability, providing a new idea for the realization of active regulation of high-performance low-dimensional optical devices.
Review
Chemistry, Inorganic & Nuclear
Manabu Nakaya, Ryo Ohtani, Leonard F. Lindoy, Shinya Hayami
Summary: This review provides an overview of reported examples of SCO iron(III) systems that exhibit the LIESST effect, which is crucial for understanding the excited states and spin state transitions in iron(III) complexes.
INORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Physics, Applied
Juliana M. da Silva, Fernando A. F. Santana, Jorge G. G. S. Ramos, Anderson L. R. Barbosa
Summary: In this study, we investigate the behavior of the spin Hall effect in a system with disorder and interface-induced spin-orbit coupling by experimental and numerical simulations of single-layer graphene devices. The results show that the spin Hall angle of graphene devices exhibits mesoscopic fluctuations and follows a universal relationship with the dimensionless longitudinal conductivity.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Multidisciplinary
Fei Gao, Rodrigo E. E. Menchon, Aran Garcia-Lekue, Mads Brandbyge
Summary: Recently, researchers have combined porphyrin units with graphene nanoribbons (Por-GNR) to create various structures. In this study, the authors use first-principles calculations to investigate the properties of two experimentally feasible Por-GNR hybrids. They find that one of the hybrids has a small band gap and can be used as electrodes in devices. By embedding a Fe atom in the porphyrin, a spin-polarized ground state is achieved. The authors examine the spin transport properties of a 2-terminal setup involving a Fe-Por-GNR between Por-GNR electrodes and observe a Fano anti-resonance feature. They also demonstrate how mechanical strain or chemical adsorption can induce spin-crossover, leading to different spin states. These findings provide valuable insights for the development of carbon-based spintronics and chemical sensing applications.
COMMUNICATIONS PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Yun Ni, Hu Hua, Jia Li, Ni Hu
Summary: The study focuses on a heterojunction composed of specific graphene and graphyne nanoribbons, showing potential for spintronic and spin caloritronic devices with excellent properties. The proposed heterojunction offers promise for multi-effect and low-power-consumption electronic devices.
Article
Engineering, Electrical & Electronic
Leon C. Camenzind, Simon Geyer, Andreas Fuhrer, Richard J. Warburton, Dominik M. Zumbuehl, Andreas Kuhlmann
Summary: The greatest challenge in quantum computing is achieving scalability. However, silicon fin field-effect transistors can host spin qubits operating above 4 K, potentially enabling the scaling and development of quantum computing systems.
NATURE ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Victor H. Guarochico-Moreira, Jose L. Sambricio, Khalid Omari, Christopher R. Anderson, Denis A. Bandurin, Jesus C. Toscano-Figueroa, Noel Natera-Cordero, Kenji Watanabe, Takashi Taniguchi, Irina Grigorieva, Ivan J. Vera-Marun
Summary: Spin injection and tunable spin signal in graphene have been achieved using van der Waals heterostructures with one-dimensional (1D) contacts. This architecture prevents significant doping from the contacts, enabling high-quality graphene channels. At low temperature, spin signals can be enhanced by electrostatic gating.
Article
Multidisciplinary Sciences
Chun-Pu Wang, Shih-Hung Cheng, Wen-Jeng Hsueh
Summary: In this paper, the advantages of using two-dimensional materials for spintronic device designs are investigated. A spin valve based on graphene nanoribbons is proposed to generate a large spin current density at room temperature, which can reach the critical value with the help of a tunable gate voltage. This proposed spin valve overcomes the difficulties faced by traditional magnetic tunnel junction-based magnetic random-access memories and meets the criteria for the reading mode, opening up possibilities for spin logic devices based on 2D materials.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
Jianwei Li, Hao Jin, Yadong Wei, Hong Guo
Summary: This study demonstrates that the intrinsic spin Hall conductivity (ISHC) in bilayer PtTe2 can be manipulated from positive to negative values by changing the stacking mode. The strong stacking-dependent ISHC originates from interlayer coupling, providing fundamental understanding and application guidelines for next-generation spintronic devices using bilayer PtTe2.
Article
Physics, Applied
Koustav Kashyap Gogoi, Avijit Chowdhurya
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Chemistry, Physical
Koustav Kashyap Gogoi, Avijit Chowdhury
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Engineering, Electrical & Electronic
Subrat Kumar Barik, Koustav Kashyap Gogoi, Sudarsan Sahoo, Hoe Joon Kim, Sugato Hajra
Summary: In the current era, the focus is on meeting energy security challenges globally due to excessive energy demands. Fossil fuels like coal and petroleum are fading out, leading to renewable energy sources becoming an alternative medium and new scientific investment. Research is being carried out to enhance the efficiency of these devices, with multifunctional materials like BNLTO showing promise for producing low-cost energy devices with superior properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Physics, Condensed Matter
Anupriya Nyayban, Subhasis Panda, Avijit Chowdhury
Summary: The text discusses the instability of organic-inorganic hybrid halide perovskites due to various environmental factors and the ongoing research to increase their stability and efficiency. Through density functional theory calculations, it explores the structural, electronic, and optical properties of RbMI3 compounds (M = Ge and Sn) to establish their chemical stability and potential for improved photovoltaic performance.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Green & Sustainable Science & Technology
Virendra Vishnu Bhagwat, Sujit Roy, Biplab Das, Nikhilkumar Shah, Avijit Chowdhury
Summary: This study investigated the performance of a heat pipe assisted parabolic trough collector with paraffin wax based phase change material for solar energy storage. The experiment was conducted in North-East India, comparing the system with and without circular fins in the heat pipe evaporator section. The presence of fins improved both charging and discharging efficiency of the latent heat storage system.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Review
Nanoscience & Nanotechnology
Suma Das, Avijit Chowdhury
Summary: Heterogeneous photocatalysis using advanced oxidation processes has a wide range of applications in water purification and environmental remediation. One promising material for this purpose is graphitic carbon nitride (g-C3N4), a metal-free polymer with excellent structural and physicochemical properties. However, challenges such as high recombination rate of electron-hole pairs, smaller specific surface area, and lower electrical conductivity limit the catalytic efficacy of g-C3N4. To overcome these challenges, magnetic nanocomposites (NCs) have been used to enhance the efficiency and reusability of the catalyst. This review summarizes the latest progress in the design and development of magnetic g-C3N4-based NCs and their applications in photocatalytic systems.
Article
Materials Science, Multidisciplinary
Nipom Sekhar Das, Saikat Mitra, Avijit Chowdhury, Asim Roy
Summary: Hybrid composites of layered two-dimensional materials, composed of reduced graphene oxide and molybdenum disulfide, exhibit stable and repeatable bipolar resistive switching characteristics. The intercalation of the reduced graphene oxide leads to an increased energy bandgap, while the restoration of carbon structure results in dominant blue emission.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Condensed Matter
Anupriya Nyayban, Subhasis Panda, Avijit Chowdhury
Summary: In this study, the structural, electronic, and optical properties of RbPb1-xMxI3 (M = {Sn,Ge} and x = {0.25, 0.50, 0.75}) were investigated by alloying the B-site with Sn and Ge. The results showed a decrease in energy bandgap with increasing Sn/Ge contents, as well as a change in exciton type in the mixed systems.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Engineering, Electrical & Electronic
Anupriya Nyayban, Subhasis Panda, Avijit Chowdhury
Summary: Structural stability is a major concern for perovskite solar cells, but compositional engineering can effectively address this issue. The structural, electronic, and optical properties of bromide mixed orthorhombic RbPb(I1-XBrX)(3) were studied using density functional theory. The lowest energy band gaps of 2.288 eV and 2.986 eV were obtained for bromide mixing of x = 0.50 using PBE and TB-mBJ, respectively. Mixed halide structures showed smaller effective mass, facilitating better carrier transport. PBE predicted Mott-Wannier type excitons, while TB-mBJ predicted Frenkel type excitons for bromide mixing of x = 0.75 and Mott-Wannier type for other mixings. The highest spectroscopic limited maximum efficiency (SLME) of 14.0% was observed for equal admixture of I and Br using PBE. The calculated properties are consistent with reported data of similar structures.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Nipom Sekhar Das, Rajesh Jana, Asim Roy, Avijit Chowdhury
Summary: Heterostructures of two-dimensional layered materials can regulate the confinement and transportation of charge carriers via vacancy-induced defect and interfacial states. In this study, reduced graphene oxide-molybdenum disulfide (rGO-MoS2) nanohybrid was fabricated and reinforced with various polymers to study resistive memory properties. The devices based on rGO-MoS2 exhibited improved memristive performances due to charge transfer interaction with the conductive carbon substrates.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Suma Das, Soumik Das, Ranjith G. Nair, Avijit Chowdhury
Summary: Ternary nanocomposites (TNCs) composed of layered functional materials are used to enhance photocatalytic performance by suppressing carrier recombination and utilizing the full UV-visible-near infrared spectrum. In this study, g-C3N4/rGO/ZnFe2O4 (CNGZF) TNCs with tunable g-C3N4 mass fraction were developed for efficient photo-Fenton reactions under visible light. The optimized TNCs exhibited superior photocatalytic efficacy compared to individual g-C3N4 and ZnFe2O4, as well as binary composite CNZF. The presence of H2O2 further enhanced the removal efficiency, achieving more than 93% and 97% degradation of methylene blue under artificial visible light and solar irradiation, respectively. The TNCs also demonstrated excellent stability and recyclability due to their magnetic properties. The enhanced performance results from the unique properties of layered nanosheets, broadband absorption capabilities, and efficient electron migration. The study provides insights into the design of advanced photocatalysts for environmental remediation.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Materials Science, Multidisciplinary
Nipom Sekhar Das, Rajesh Jana, Asim Roy, Avijit Chowdhury
Summary: Nanohybrid of rGO-SnS2 reinforced with polymers shows memory characteristics in MIM configuration. Polymer films encapsulating the nanohybrid promote charge transfer. The combination of nanohybrid with PMMA and PVDF/or polymer blend exhibits distinct memory features.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Suma Das, Swapnamoy Pramanik, Ranjith G. Nair, Avijit Chowdhury
Summary: Tailoring the surface properties of catalysts by introducing functional groups has been an effective strategy to enhance photocatalytic performance. In this study, ultrathin nanosheets of graphitic carbon nitride (g-C3N4) were produced through thermal exfoliation, exhibiting a high specific surface area and abundant active sites. These nanosheets showed superior photocatalytic activity in the degradation of various pollutants and antibiotics in aqueous solutions, making them promising materials for energy and environmental applications.
NEW JOURNAL OF CHEMISTRY
(2023)
Review
Chemistry, Physical
Suma Das, Trinayana Deka, Pujita Ningthoukhangjam, Avijit Chowdhury, Ranjith G. Nair
Summary: Solar photocatalysis using graphitic carbon nitride is a promising solution for sustainable energy and environmental issues. However, its photocatalytic performance is limited by factors such as low absorption range and high electron-hole recombination rate. Various strategies, including doping and forming Z-scheme heterojunctions, have been developed to overcome these limitations. Among them, direct Z-scheme photocatalysts have shown the most potential, especially those based on narrow band gap graphitic carbon nitride. However, further optimization and understanding of the Fermi level alignment are still needed for commercialization.
APPLIED SURFACE SCIENCE ADVANCES
(2022)
Article
Chemistry, Multidisciplinary
Debarati Chakraborty, Meghali Devi, Bishal Das, Monjur H. Barbhuiya, Siddhartha S. Dhar, Avijit Chowdhury
Summary: A novel MoO3-bonded imidazolium sulfonic acid chloride (MoO3-IL) was synthesized and applied for the photocatalytic degradation of ciprofloxacin and metronidazole. The photocatalyst showed high degradation efficiency due to the synergism of nano MoO3 and ionic liquid, lower band gap, and late recombination of photoinduced charge carriers.
NEW JOURNAL OF CHEMISTRY
(2021)
