Article
Chemistry, Physical
Jiajia Chen, Kai Wu, Wei Hu, Jinlong Yang
Summary: Research shows that 2D polar perovskites have large Rashba constants and strong electric field responses, making them suitable for use in spin FETs, enabling a short spin channel length of tens of nanometers to preserve spin coherence.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Physics, Multidisciplinary
Zheng Chen, Zhongran Liu, Yanqiu Sun, Xiaoxin Chen, Yuan Liu, Hui Zhang, Hekang Li, Meng Zhang, Siyuan Hong, Tianshuang Ren, Chao Zhang, He Tian, Yi Zhou, Jirong Sun, Yanwu Xie
Summary: This report discusses the observation of superconductivity at the interface between LaAlO3 film and KTaO3 single crystal, suggesting a two-dimensional nature. The study provides estimates for carrier density, superconducting layer thickness, and coherence length.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Lijie Wang, Wenhao He, Guangyi Huang, Huanyi Xue, Guanqun Zhang, Gang Mu, Shiwei Wu, Zhenghua An, Changlin Zheng, Yan Chen, Wei Li
Summary: This study reports the observation of two-dimensional superconductivity at the interface between a Mott insulator Ti2O3 and a polar semiconductor GaN, with a high transition temperature of up to 3.8 K. A striking quantum metallic state is also observed at the verge of superconductivity, indicating its precursor nature. These findings suggest exciting opportunities for exploiting emergent quantum phenomena at heterointerfaces through heterostructure engineering.
Article
Chemistry, Physical
Yuming Jin, Jia Li, Guang Wang, Qian Zhang, Ze Liu, Xiujuan Mao
Summary: The electronic structures and Rashba effect of two-dimensional polar tetragonal perovskites TlSnX3 (X = Cl, Br, I) were investigated using density functional theory. Intrinsic Rashba effects were found, with TlSnI3 exhibiting the largest Rashba constant. Additionally, TlSnBr3 and TlSnI3 showed strong responses to an applied electric field. These materials have promising applications due to their large Rashba constants and strong electric field responses.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Physics, Applied
Yan Wang, Jiahe Cao, Hanzhao Song, Chuang Zhang, Zhigao Xie, Yew Hoong Wong, Chee Keong Tan
Summary: This study presents an investigation of the polarization in ε-(AlxGa1-x)(2)O-3/ε-Ga2O3 heterostructures. The results show that the spontaneous polarization increases with the increase in Al content, but the strain-induced piezoelectric polarization also increases, resulting in the total polarization remaining almost constant. Additionally, a high-density polarization-induced 2DEG can be formed at the interface of polarization reversed ε-(AlxGa1-x)(2)O-3/ε-Ga2O3.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Tarek Hidouri, Antonella Parisini, S. Dadgostar, J. Jimenez, R. Fornari
Summary: In this study, ε-Ga2O3 films were deposited on (0001)-Al2O3 substrates using metal-organic vapor phase epitaxy, and their properties were investigated using experimental and theoretical methods. The extracted emission peaks from cathodoluminescence measurements demonstrated a non-monotonic behavior, which was attributed to localization phenomena related to point defects. The temperature-dependent behavior of the main luminescence emissions was successfully simulated using a localized state ensemble model.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Weiqu Chen, Haoxun Luo, Zimin Chen, Yanli Pei, Gang Wang, Xing Lu
Summary: This letter reports the demonstration of epsilon-phase gallium oxide (epsilon-Ga2O3) based MOSFETs for the first time. The high crystalline quality of the epilayer was confirmed, and fluorine atoms were incorporated to decrease the sheet resistance. The MOSFETs showed a high output current density and a significant carrier accumulation near the film surface, indicating the potential of epsilon-Ga2O3 based electronics for high-speed and high-power applications.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Ruijia Zhang, Min Li, Gai Wu, Lijie Li, Zhaofu Zhang, Kang Liang, Wei Shen
Summary: Fl-Ga2O3 is a promising material for next-generation power electronic and optoelectronic devices due to its exceptional properties. This study investigates the effects of strain engineering on the electronic properties of fl-Ga2O3, revealing that strain manipulation can induce a bandgap transition and changes in effective masses and electron mobility. These findings provide important insights for utilizing strain engineering as a powerful tool for modulating fl-Ga2O3's electronic properties.
RESULTS IN PHYSICS
(2023)
Article
Chemistry, Physical
Y. Yang, K. H. Gao, W. J. Wang, G. Yu, Y. Sun, X. H. Zhang, Z. Q. Li
Summary: An anomalous carrier-concentration dependence of electron-electron interactions was observed in epitaxial graphene on SiC, offering a new route to control EEI in graphene.
Article
Chemistry, Physical
Xinli Wang, Juping Xu, Peng-Fei Liu, Bao-Tian Wang, Wen Yin
Summary: Understanding the electronic properties of 2D semiconductor heterostructures is crucial for their application in photocatalyst and nano-electronic devices. In this study, we use first-principles calculations to systematically investigate the electronic properties of QL-Al2O3/MoSO heterostructures. We find that the evolution of band alignment, spatial charge distribution, and interface charge transfer is synergetic, and driven by the inner polarization electric field.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Yuanjun Yang, Guilin Wang, Wenyu Huang, Cangmin Wang, Yingxue Yao, Xiaoli Mao, Hui Lin, Ting Zhang, Huaili Qiu, Zhongjun Li, Hui Zhang, Yuewei Yin, Jinhua Guo, Yong Guan, Wensheng Yan, Zhenlin Luo, Chongwen Zou, Yangchao Tian, Gang Xiao, Xiaoguang Li, Chen Gao
Summary: A vertical heterojunction made of VO2 and TiO2 is demonstrated with an efficient modulation of its metal-insulator transition by visible light irradiation, showing reversible optical tunability. The magnitude of the transition and resistance switching are influenced by light power density, indicating potential optically controlled applications.
SCIENCE CHINA-MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Debjit Ghoshal, Hanzhi Shang, Xin Sun, Xixing Wen, Dongxue Chen, Tianmeng Wang, Zonghuan Lu, Tushar Gupta, Harry Efstathiadis, Damien West, Nikhil Koratkar, Toh-Ming Lu, Shengbai Zhang, Su-Fei Shi
Summary: Through the use of mica as a model substrate, the growth mechanism of large-area epitaxial PbI2 thin films was revealed, uncovering the presence of inversion domain boundaries supporting the growth of epitaxial films. By combining experimental results with first-principles calculations, a deeper understanding of the thermodynamic and kinetic factors governing the growth mechanism was achieved, laying the foundation for the synthesis of high-quality large-area PbI2 thin films on other substrates.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Ceramics
Xiao Tang, Kuang-Hui Li, Che-Hao Liao, Jose Manuel Taboada Vasquez, Chuanju Wang, Na Xiao, Xiaohang Li
Summary: The study presents a novel CSD technique for depositing highly epitaxial indium and aluminum-doped Ga2O3 thin films, showing pure beta phase with good crystallization qualities. The incorporation of indium and aluminum shifts the crystallization of the thin films to lower and higher temperatures, respectively, and the bandgap of the sintered thin films can be tuned from 4.05 to 5.03 eV using mixed precursor solutions. Photodetectors based on the samples exhibit maximum photocurrents at different wavelengths, suggesting potential for producing high-quality bandgap tunable deep ultraviolet photoelectrical and high-power devices.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Haohao Chen, Junlei Zhao, Xinyu Wang, Xiaolong Chen, Zhaofu Zhang, Mengyuan Hua
Summary: This study investigates the effects of polarization reversal transition of the 2D ferroelectric Ga2O3 monolayer on MoS2/Ga2O3 heterogeneous bilayers. The results demonstrate distinct changes in the heterostructures and excellent optical absorption under biaxial strain, indicating potential applications in flexible electrical and optical devices. The highly tunable physical properties of the bilayer heterostructures are also explored for photocatalytic water splitting and field-controlled switch channel in MOSFET devices.
Article
Chemistry, Physical
A. Y. Polyakov, V. I. Nikolaev, A. I. Pechnikov, E. B. Yakimov, S. Yu. Karpov, S. I. Stepanov, I. V. Shchemerov, A. A. Vasilev, A. V. Chernykh, A. Kuznetsov, In-Hwan Lee, S. J. Pearton
Summary: Typically, semiconducting oxides and nitrides exhibit conductivity type asymmetries. In this study, p-type conductivity was observed at the kappa-Ga2O3/AlN interface. Lightly Sn-doped-Ga2O3 films were deposited on AlN/Si templates using HVPE method. Measurements on Schottky diodes and Ohmic contacts showed p-type-like behavior, and EBIC images suggested the formation of a p-type layer near the Ga2O3/AlN interface. Modelling indicated the formation of a two-dimensional hole layer at this interface, depending on the doping level and thickness of the kappa-Ga2O3.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Yang Liu, Guodong Ren, Tengfei Cao, Rohan Mishra, Jayakanth Ravichandran
Summary: This article presents a method for calculating the electro-optic coefficients of ferroelectric materials and applies it to study the electro-optic constants of BaTiO3, LiNbO3, and LiTaO3. The predicted constants agree with experimental results and provide benchmarks for experimental verification.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Multidisciplinary Sciences
John Cavin, Rohan Mishra
Summary: Alloying is an important strategy for tuning the phases and properties of two-dimensional transition metal dichalcogenides. This study presents a method for generating temperature-composition equilibrium phase diagrams by combining total-energy calculations with thermodynamic solution models, and successfully applies it to three representative 2D TMDC alloys.
Article
Chemistry, Physical
Boyang Zhao, Md Shafkat Bin Hoque, Gwan Yeong Jung, Hongyan Mei, Shantanu Singh, Guodong Ren, Milena Milich, Qinai Zhao, Nan Wang, Huandong Chen, Shanyuan Niu, Sang-Jun Lee, Cheng-Tai Kuo, Jun-Sik Lee, John A. Tomko, Han Wang, Mikhail A. Kats, Rohan Mishra, Patrick E. Hopkins, Jayakanth Ravichandran
Summary: Low-dimensional materials, such as chain-like or layered structures, exhibit significant anisotropic electrical, optical, and thermal properties. BaTiS3 (BTS), a material with a chain-like structure, has been found to possess giant in-plane optical anisotropy and glass-like thermal conductivity. By characterizing BTS crystals with different orientations, it is revealed that BTS has strong optical and thermal anisotropy.
CHEMISTRY OF MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Mythili Surendran, Boyang Zhao, Guodong Ren, Shantanu Singh, Amir Avishai, Huandong Chen, Jae-Kyung Han, Megumi Kawasaki, Rohan Mishra, Jayakanth Ravichandran
Summary: In this study, quasi-epitaxial thin films of hexagonal chalcogenide BaTiS3 were successfully grown by pulsed laser deposition. The effects of various growth conditions on the film structure were examined. Weak epitaxial relationships between the film and substrate were observed, providing a pathway for the realization of hexagonal chalcogenide thin films and their heterostructures with perovskite chalcogenides.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Upendra Kumar, Vipin Kumar, Ajay Kumar Kushwaha, Sung Beom Cho
Summary: This study investigates the behavior of bulk and surface state of topological insulators under a high frequency electromagnetic field, revealing the presence of Floquet oscillation. The Floquet approximation is validated through numerical simulation.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Chemistry, Physical
Hyunseok Ko, Wonkyeong Son, Min Sung Kang, Han Uk Lee, Chan-Yeup Chung, Seungwu Han, Changsoon Choi, Sung Beom Cho
Summary: Hydrovoltaics, an emerging technology, harvests energy from water using nanostructured materials. However, the lack of understanding of its principles has limited its advancement. This study presents the first multiscale and multiphysics model for hydrovoltaic phenomena, providing a detailed interpretation and analysis of its working principles. Experimental validation supports the model, which considers hydrodynamics, ion transport, chemical reactions, and electrostatics. Protonation and ionic dynamics are found to be key factors for electricity generation, while the asymmetric proton concentration gradient drives the electric potential. The study also investigates the effects of various parameters on the electrical performance of hydrovoltaic devices.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Tengfei Cao, Guodong Ren, Ding -Fu Shao, Evgeny Y. Tsymbal, Rohan Mishra
Summary: The recent observation of ferroelectricity in binary metal oxides, such as HfO2, ZrO2, Hf0.5Zr0.5O2, and Ga2O3, has attracted much attention. Hole doping is proposed to play a key role in stabilizing polar phases in these oxides. First-principles calculations demonstrate that holes mainly occupy one of the oxygen sublattices and their localization enhances the electrostatic energy of the system, making the polar phase more stable at high concentrations. The electrostatic mechanism is responsible for the stabilization of the ferroelectric phase in HfO2 doped with elements that introduce holes to the system.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hongyan Mei, Guodong Ren, Boyang Zhao, Jad Salman, Gwan Yeong Jung, Huandong Chen, Shantanu Singh, Arashdeep S. Thind, John Cavin, Jordan A. Hachtel, Miaofang Chi, Shanyuan Niu, Graham Joe, Chenghao Wan, Nick Settineri, Simon J. Teat, Bryan C. Chakoumakos, Jayakanth Ravichandran, Rohan Mishra, Mikhail A. Kats
Summary: This work demonstrates that a bulk crystal with subtle periodic modulations in its structure, Sr9/8TiS3, exhibits transparent and positive-uniaxial properties in the mid- to far-infrared range, with extraordinary index n(e) = 4.5 and ordinary index n(o) = 2.4. The unique structural modulations contribute to the formation of highly oriented electron clouds, resulting in record birefringence.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
TaeHyun Hong, Hyeon Woo Kim, Yoon-Seo Kim, Hyun-Jun Jeong, Sung Beom Cho, Jin-Seong Park
Summary: In this study, a computational workflow based on DFT was used to design metastable materials, and PEALD was found to be a profitable method for synthesizing the target material. The CAH-IZO material, with its superior electrical properties, was identified as a promising candidate for thin-film transistor (TFT) applications.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Min Sung Kang, Hyunseok Ko, Seokhee Lee, Sung Beom Cho
Summary: Hydrovoltaic is a promising energy harvesting technology that generates energy through the direct interaction of water and material. The distribution of ions plays a key role in improving the voltage output, with a higher gradient of ions' concentration leading to stronger potential differences. The presence of salt ions significantly affects the electrical performance, making it highly sensitive to substrate porosity but less sensitive to relative humidity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Geosciences, Multidisciplinary
Rajan K. Chakrabarty, Nishit J. Shetty, Arashdeep S. Thind, Payton Beeler, Benjamin J. Sumlin, Chenchong Zhang, Pai Liu, Juan C. Idrobo, Kouji Adachi, Nicholas L. Wagner, Joshua P. Schwarz, Adam Ahern, Arthur J. Sedlacek, Andrew Lambe, Conner Daube, Ming Lyu, Chao Liu, Scott Herndon, Timothy B. Onasch, Rohan Mishra
Summary: Observations of smoke plumes in the United States shows that atmospheric short-wave absorption due to wildfire smoke is mainly caused by dark brown carbon particles. Wildfires release large amounts of black carbon and light-absorbing organic carbon, known as brown carbon, into the atmosphere, which disrupts Earth's radiation budget. It is important to quantify these radiative impacts as wildfires are predicted to increase globally.
Article
Nanoscience & Nanotechnology
Giulio Fatti, Alessandra Ciniero, Hyunseok Ko, Han Uk Lee, Yujin Na, Chang Kyu Jeong, Sang-Geul Lee, Dongyub Kwak, Kwi-Il Park, Sung Beom Cho, Daniele Dini
Summary: The lack of theoretical understanding of triboelectrification has hindered the development of energy harvesting technologies like triboelectric nanogenerators. A model predictive of the triboelectric behavior of polytetrafluoroethylene is formulated, driving the development of improved nanogenerators. By using a combined computational-experimental approach, it is shown that defluorination enhances the triboelectric charging of polytetrafluoroethylene at the nanoscale, leading to a one-order-of-magnitude output increase in triboelectric nanogenerators.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Hyeon Woo Kim, Joo Hyeong Han, Hyunseok Ko, Tuhin Samanta, Dong Geon Lee, Dong Won Jeon, Woongchan Kim, Yong-Chae Chung, Won Bin Im, Sung Beom Cho
Summary: Exploring the vast and veiled chemical spaces through synthesis is crucial in solid-state materials. This study focuses on navigating metal halides, particularly the coexistence of perovskites and their derivatives, which has restricted their exploration. By combining high-throughput density functional theory calculations and machine learning, the researchers systematically explore inorganic halide perovskite derivatives, charting the chemical spaces and predicting their electrical properties and thermal stability. The successful synthesis of new Cs3LuCl6 and its application in white-light-emitting diodes showcase the potential practical applications of inorganic metal halides.
ACS ENERGY LETTERS
(2023)
Article
Multidisciplinary Sciences
Xin Li, Yu Yun, Arashdeep Singh Thind, Yuewei Yin, Qiang Li, Wenbin Wang, Alpha T. N'Diaye, Corbyn Mellinger, Xuanyuan Jiang, Rohan Mishra, Xiaoshan Xu
Summary: This study investigates the electrical modulation of magnetic states in single-phase multiferroic materials using domain-wall magnetoelectric (ME) coupling. Results show that the domain-wall ME effect is dramatically enhanced when the separation between ferroelectric (FE) domain walls shrinks below the characteristic width of the antiferromagnetic (AFM) domain walls. These findings suggest that the domain-wall ME effect is capable of electrical control of magnetization.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Sungyoon Jung, Tengfei Cao, Rohan Mishra, Pratim Biswas
Summary: This study investigates the effect of CO2 concentration in the feed stream on CH4 oxidation in oxy-combustion systems. Experimental results show that an increase in CO2 concentration leads to a higher rate of CO2 generation and complete CH4 oxidation. Theoretical calculations suggest that a high surface coverage of CO2 on Pd reduces the activation energy for CH4 dissociation and subsequent oxidation reactions. These findings indicate the beneficial role of a CO2-rich environment in reducing oxygen content in exhaust gases.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
