Article
Physics, Multidisciplinary
Ran Feng, Liang Yan, Jiandi Zhang
Summary: Oxide interfaces exhibit intriguing phenomena, such as broken symmetry, lattice mismatch, charge transfer, and spatial confinement. The interface superconductivity in oxide heterostructures has attracted extensive attention due to its rich physical connotations. It not only provides alternative research platforms for exploring new superconductors and investigating superconducting mechanisms, but also opens up possibilities for future electronic device applications. Recent developments in heteroepitaxial techniques and accurate characterization methods have led to the discovery of quasi-two-dimensional interface superconductivity in various oxide heterostructures, revealing novel quantum phenomena and advancing the field of condensed matter physics. This review focuses on the quasi-two-dimensional superconductivity at oxide interfaces, using examples such as LaAlO3/SrTiO3 and copper oxides like La2CuO4/La1.56Sr0.44CuO4 to summarize the novel physical phenomena associated with interface superconductivity in complex oxide heterostructures. The remaining challenges and future prospects of interface superconductivity are also discussed.
ACTA PHYSICA SINICA
(2023)
Article
Chemistry, Physical
Yoonseo Jang, Dohwan Jung, Prakash R. Sultane, Christopher W. Bielawski, Jungwoo Oh
Summary: Beryllium oxide (BeO) is a metal oxide with excellent thermal conductivity and dielectric strength, which can form highly polarized heterostructures with different substrates. We have demonstrated the formation of a polarization-induced two-dimensional electron gas (2DEG) at the BeO/ZnO heterostructure interface, which exhibits high sheet carrier concentration and mobility, making it suitable for various electronic devices.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Kitae Eom, Hanjong Paik, Jinsol Seo, Neil Campbell, Evgeny Y. Tsymbal, Sang Ho Oh, Mark S. Rzchowski, Darrell G. Schlom, Chang-Beom Eom
Summary: This study reports the formation of 2-dimensional electron gases (2DEGs) with high mobility at room temperature at the LaScO3/BaSnO3 interface. By reducing the dislocation density and obtaining an atomically flat surface through specific treatment methods, an order of magnitude higher mobility at room temperature than previously achieved is achieved. This work opens up new possibilities for exploring the exciting physics of stannate-based 2DEGs at temperatures relevant to applications in oxide nanoelectronics.
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
Physics, Condensed Matter
Xiaobing Chen, Jine Zhang, Banggui Liu, Fengxia Hu, Baogen Shen, Jirong Sun
Summary: Heterointerfaces between infinite-layer oxide and perovskite oxide exhibit distinct interfacial effects, including the presence of a two-dimensional electron gas (2DEG) that exists in both interface layers. The metallicity of the new interface is robust even as the thickness of the SrCuO2 layer decreases. The conducting states in the interface layer follow the d(xy) form due to the absence of apical oxygen.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Chemistry, Multidisciplinary
Sakineh Chabi, Zeynel Guler, Adrian J. Brearley, Angelica D. Benavidez, Ting Shan Luk
Summary: This study reports the successful synthesis of true two-dimensional silicon carbide using a top-down approach. The isolated 2D SiC nanosheets are environmentally stable and show potential for applications in light-emitting devices. The thickness of the nanosheets showed a strong correlation with the intensity of the longitudinal optical Raman mode.
Article
Physics, Applied
Wente Li, Lingyuan Gao, Wei Guo, Agham Posadas, Alexander A. Demkov
Summary: New functionalities and unexpected electronic structures can emerge in artificially engineered complex oxide heterointerfaces through the coupling of multiple physical properties. By combining theoretical analysis, experimental growth, and atomic level resolution techniques, intriguing emergent interfacial phenomena can be highlighted. Various methods such as band offset engineering, polarization doping, and oxygen vacancy doping are discussed for creating a two-dimensional carrier gas and manipulating electron/hole gases for potential applications in new electronic devices.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Oliver Dowinton, Denis Maryenko, Rodion Vladimirovich Belosludov, Bohm-Jung Yang, Mohammad Saeed Bahramy
Summary: 2D phases of matter have brought a wealth of novel quantum phenomena and device applications. This study presents a non-traditional method to realize a quasi-2D electron gas in a 3D bulk oxide perovskite, with magnetically controllable topological spin textures. The anomalous Hall effect and quantum oscillations in charge conductivity and thermoelectric properties are proposed as routes to experimentally demonstrate the quasi-2D behavior.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Zhuchi Wang, Shuming Zeng, Yinchang Zhao, Xinming Wang, Jun Ni
Summary: The study focuses on the search for multigap superconductors in two-dimensional boron-based materials doped with metal atoms, resulting in the discovery of stable InB2 and InB4 films with high Tc values of 41.5K and 53K, respectively. Additionally, the superconducting behavior of InB4 films is found to be influenced by biaxial strain, with Tc reaching up to 64K under specific conditions. Other trilayer films like GeB4 and ZnB4 also exhibit high Tc values of 48.5K and 32K, respectively, as two-gap superconductors.
Article
Physics, Multidisciplinary
A. Shuvaev, V. M. Muravev, P. A. Gusikhin, J. Gospodaric, A. Pimenov, I. Kukushkin
Summary: The experimental discovery of superluminal electromagnetic 2D plasma waves in a high-quality GaAs/AlGaAs two-dimensional electron system on a dielectric substrate is reported. The study shows a strong hybridization between plasma and Fabry-Perot light modes at large two-dimensional densities, and the plasma resonance split into two modes in the presence of a perpendicular magnetic field, each corresponding to a specific sense of circular polarization. The experimental results are in good agreement with the theory.
PHYSICAL REVIEW LETTERS
(2021)
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
Chemistry, Multidisciplinary
Srijani Mallik, Gerbold C. Menard, Guilhem Saiz, Ildar Gilmutdinov, David Vignolles, Cyril Proust, Alexandre Gloter, Nicolas Bergeal, Marc Gabay, Manuel Bibes
Summary: A study has found a large linear magnetoresistance in a SrTiO3 two-dimensional electron gas, which is caused by nanoscale inhomogeneities and revealed by interference between helicoidal electron trajectories, determining the thickness of 2DEG. These results deepen our understanding of the origin of linear magnetoresistance in quantum materials and open up exciting possibilities for exploring the interaction of linear MR with features like Rashba spin-orbit coupling.
Article
Nanoscience & Nanotechnology
Leyan Nian, Jiayi Li, Zhichao Wang, Tingting Zhang, Haoying Sun, Yueying Li, Tianyi Gao, Yu Deng, Yuefeng Nie, Yufeng Hao
Summary: Conductive amorphous Al2O3/SrTiO3 heterostructures have been successfully synthesized on a silicon wafer through a growth-and-transfer method. The formation of a two-dimensional electron gas (2DEG) at the interface of aAO/STO has been confirmed through electron energy loss spectroscopic measurements. This work provides a feasible strategy for integrating 2DEG on a silicon wafer and other desired substrates, with potential significance for functional and flexible electronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Heng-Jui Liu, Mao Ye, Chao-Yao Yang, Yue-Wen Fang, Yi-Ying Chin, Chun-Ying Chen, Ruei Tze Hung, Yuanmin Zhu, Liang-Ching He, Min-Yuan Huang, Lang Chen, Meng Gu, Shanming Ke, Yen-Fa Liao, Ku-Ding Tsuei, Hong-Ji Lin, Chien-Te Chen, Stefano Agrestini, Javier Herrero-Martin, Chih-Huang Lai
Summary: This study achieved robust room-temperature soft ferromagnetism and metallic characteristics in a high-quality SrRuO3 monolayer-based superlattice. The findings of local antiferromagnetic coupling between partial Ru and Ti ions not only break long-range ferromagnetic order, but also stabilize the intralayer ferromagnetic order in the SrRuO3 monolayers.
APPLIED MATERIALS TODAY
(2021)
Article
Chemistry, Physical
Leah Isseroff Bendavid, Serena Inoue, Brandon Mai, Sandra Yu
Summary: In this study, CdS/graphene bilayers were examined for their enhanced photocatalytic activity. Graphene oxide (GO) was used to strengthen interfacial adhesion in the CdS/graphene bilayer and tune its electronic properties. The effects of oxygen concentration and functional group identity on the interfacial and electronic properties were investigated. It was found that increasing the oxygen concentration weakened the interfacial adhesion, while increasing the hydroxyl functional group concentration could potentially enhance adhesion. The electronic structure of CdS monolayer was not significantly affected by the GO layer, preserving its optimal optoelectronic properties. However, the band edge alignment between the layers could be tuned by varying the oxygen composition of GO, thus increasing the efficiency of photoexcited charge transfer.
SURFACES AND INTERFACES
(2022)
Article
Oncology
Saule Khamzina, Jongoh Lee, Seung-Bum Ryoo, Min Jung Kim, Ji Won Park, Hyun-Cheol Kang, Eui Kyu Chie, Dae-Won Lee, Sae-Won Han, Tae-You Kim, Seung-Yong Jeong, Kyu Joo Park
Summary: The interval between neoadjuvant chemoradiotherapy (nCRT) and surgery has been debated for its impact on oncological outcomes and postoperative complications. This study found that performing surgery >8 weeks after nCRT can increase tumor regression, but it does not significantly affect oncological outcomes and postoperative complications compared to surgery conducted at 6-8 weeks after nCRT.
JOURNAL OF SURGICAL ONCOLOGY
(2023)
Article
Physics, Multidisciplinary
L. Luo, M. Mootz, J. H. Kang, C. Huang, K. Eom, J. W. Lee, C. Vaswani, Y. G. Collantes, E. E. Hellstrom, I. E. Perakis, C. B. Eom, J. Wang
Summary: The coupling between superconductors and oscillation cycles of light pulses, known as lightwave engineering, remains poorly understood due to the lack of measurements of high-order correlation functions. This study reports the discovery of parametrically driven superconductivity in iron-based superconductors induced by light-induced order-parameter collective oscillations. By separating the terahertz-frequency multidimensional coherent spectra, we measured non-perturbative, high-order correlations and found that the breakdown of susceptibility perturbative expansion occurs in this parametric quantum matter.
Article
Surgery
Jung Wook Suh, Heung-Kwon Oh, Jeehye Lee, In Jun Yang, Hong-min Ahn, Duck-Woo Kim, Sung-Bum Kang, Rumi Shin, Seung Chul Heo, Dong Woon Lee, Sung-Chan Park, Dae Kyung Sohn, Jae Hwan Oh, Min Jung Kim, Ji Won Park, Seung-Bum Ryoo, Seung-Yong Jeong, Kyu Joo Park, Seoul Colorectal Res Grp SECOG
Summary: In obstructive left-sided colorectal cancer, the time interval between self-expanding metallic stenting (SEMS) and radical surgery does not significantly impact short- and long-term outcomes.
SURGICAL ENDOSCOPY AND OTHER INTERVENTIONAL TECHNIQUES
(2023)
Article
Materials Science, Multidisciplinary
Ga In Choi, Chung Wung Bark, Hyung Wook Choi
Summary: The study focuses on the development of a mixed-cation halide perovskite-based photodetector for deep-UV sensing. By mixing different ions, the prepared perovskite exhibits high stability, excellent light absorption, and increased bandgaps. The FAPbCl3-MAPbCl3 perovskite shows high responsivity, detectivity, and external quantum efficiency, making it a promising material for sensitive photodetection.
Article
Chemistry, Multidisciplinary
Zunjian Ke, Dong He, Xingxu Yan, Wenhui Hu, Nicholas Williams, Hongxing Kang, Xiaoqing Pan, Jier Huang, Jing Gu, Xiangheng Xiao
Summary: Nitrate and nitrite are common contaminants in industrial wastewater and groundwater. The electroreduction of NOx- to produce ammonia presents a sustainable alternative to the energy-intensive Haber-Bosch process. However, the development of selective catalysts that can regulate the reaction pathway and suppress competing reactions is still lacking.
Article
Chemistry, Multidisciplinary
Yifan Ding, Zixiong Shi, Yingjie Sun, Jianghua Wu, Xiaoqing Pan, Jingyu Sun
Summary: A generic and simple material strategy has been presented to fabricate advanced mediator for improved sulfur electrochemistry. The Li-S cells derived from this strategy exhibit impressive cyclic performances and durable areal capacity, indicating the potential for rationalizing the design and modulation of reliable polysulfide mediators in Li-S batteries.
Article
Chemistry, Analytical
Zhaoyuan Lyu, Shichao Ding, Lingzhe Fang, Xin Li, Tao Li, Mingjie Xu, Xiaoqing Pan, Wenlei Zhu, Yang Zhou, Dan Du, Yuehe Lin
Summary: In this study, a two-dimensional Fe-N-C-based single-atomic-site catalyst (2D Fe-SASC) with excellent peroxidase-like activity was successfully synthesized and used to design ELISA for herbicide detection. The 2D structure of Fe-SASC exposes numerous single atomic active sites on the surface, enhancing the sensing performance. The assembled 2D Fe-SASC into a competitive ELISA kit achieved excellent detection performance for 2,4-dichlorophenoxyacetic acid (2,4-D). Fe-SASC shows great potential to replace expensive natural enzymes and work on various advanced sensing platforms for the detection of different target biomarkers.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Huaixun Huyan, Zhe Wang, Linze Li, Xingxu Yan, Yi Zhang, Colin Heikes, Darrell G. Schlom, Ruqian Wu, Xiaoqing Pan
Summary: Defect engineering in perovskite thin films has received extensive attention due to their atomic-level modification and the design of novel nanostructures. However, three-dimensional defect-assisted nanostructures in thin film matrices usually have large misfit strains and unstable structures. In contrast, one- or two-dimensional defect-assisted nanostructures embedded in thin films can sustain large misfit strains without relaxation, making them suitable for defect engineering in perovskite thin films.
Article
Materials Science, Multidisciplinary
Thi My Huyen Nguyen, Chung Wung Bark
Summary: In this study, a self-powered ultraviolet photodetector based on a p-n junction of ZnO@Polyvinylidene fluoride (PVDF) and poly [9,9-dioctylfluorene-co-N-[4-(3-methylpropyl)]-diphenylamine] (TFB) was developed by integrating an in-situ piezoelectric effect into the photoactive region. The fabricated ZnO@fiPVDF nanocomposite with strong piezoelectricity exhibited improved on/off ratio, detectivity, and response speed under 365-nm UV illumination. The device also showed stable operation over 1000 continuous on/off cycles and long-lasting photostability when exposed to UV light.
Review
Chemistry, Physical
Vo Pham Hoang Huy, Thi My Huyen Nguyen, Chung Wung Bark
Summary: This review provides comprehensive insights into the factors that influence the performance of the electron transport layer (ETL) SnO2 in perovskite solar cells (PSCs). The potential for doping is evaluated, aiming to achieve better results in PSCs and promote further development of SnO2-based PSCs.
Article
Materials Science, Multidisciplinary
Rui Tang, Rui He, Sangmo Kim, Chung Wung Bark
Summary: Driven by the demand for renewable and clean energy, this study investigated the photovoltaic effect of various solar cells and materials. By modifying the BLT and Co-BLT composites with FeCo-BLT films, the bandgap was narrowed and visible light absorption was increased, resulting in improved photovoltaic power generation performance. The modified double-ferroelectric, thin-film composites showed superior optoelectronic properties and enhanced current density, indicating improved efficiency of ferroelectric thin-film photovoltaic reactions.
Article
Chemistry, Multidisciplinary
Manh Hoang Tran, Thi My Huyen Nguyen, Chung Wung Bark
Summary: Al-doped ZnO (AZO) thin films are effective n-type semiconductors for UV detection. However, finding a balance between performance and fabrication ease remains a challenge for practical AZO-based UV photodetectors. In this study, a strategy is proposed to achieve a large photoactive area for outstanding performance using a facile sol-gel method.
Article
Chemistry, Multidisciplinary
Jaeha Lee, Peter Tieu, Jordan Finzel, Wenjie Zang, Xingxu Yan, George Graham, Xiaoqing Pan, Phillip Christopher
Summary: The addition of platinum-group metals (PGMs, e.g., Pt) to CeO2 promotes the rate of redox surface reactions in heterogeneous catalysis. However, the mechanistic picture of PGM-promoted H-2 reactions on CeO2 surfaces in powder catalysts remains unclear. This study investigates the influence of Pt nanoclusters and single atoms on H-2 reactions on Pt/CeO2 powder catalysts using controlled catalyst synthesis and various experimental techniques. The results show that Pt can promote H-2 consumption rates even when existing on a small fraction of CeO2 particles, and Pt changes the activation mechanism and rate limiting step for H-2 on CeO2 surfaces.
Article
Engineering, Electrical & Electronic
Thi My Huyen Nguyen, Manh Hoang Tran, Chung Wung Bark
Summary: In this study, an efficient ultraviolet photodetector (UV PD) is prepared based on a p-n junction that is metal-electrode-free and with a vertical configuration. The device exhibits high responsivity, a good on/off ratio, and fast response speed, with improved performance under reverse bias.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Review
Physics, Applied
Christopher Addiego, Wenpei Gao, Huaixun Huyan, Xiaoqing Pan
Summary: This article discusses the developments in high-resolution real-space charge distribution imaging using diffraction techniques and electron microscopy, focusing on the recent advancement of four-dimensional scanning transmission electron microscopy, electron holography, and applications to materials interfaces.
NATURE REVIEWS PHYSICS
(2023)