Article
Chemistry, Multidisciplinary
Chenxi Huang, Jun Fu, Miaomiao Xiang, Jiefu Zhang, Hualing Zeng, Xiang Shao
Summary: The research focused on the impact of interface interactions on the functionality of semiconductor heterojunctions when incorporating two-dimensional materials. By directly growing MoS2 nanosheets on SrTiO3 single crystal substrates, a model system with high-quality interfaces in the SH has been successfully constructed.
Article
Chemistry, Multidisciplinary
Inshad Jum'h, Husam H. Abu-Safe, Morgan E. Ware, I. A. Qattan, Ahmad Telfah, Carlos J. Tavares
Summary: This study investigates the surface atomic arrangement and physical properties of aluminum ultrathin layers deposited on c-Si(111)-7 x 7 and hydrogen-terminated c-Si(111)-1 x 1 surfaces using molecular beam epitaxy. X-ray photoelectron spectroscopy was used to determine the surface species, and 3D atomic force microscopy was used to investigate clustering formations in the film structure. Reflection high-energy electron diffraction experiments confirmed the surface crystalline structure of the c-Si(111) during the deposition of the aluminum layers. The surface electrical conductivity was tested against atmospheric oxidation, showing differences in conductivity based on the formation of various alloys on the surface.
Article
Multidisciplinary Sciences
Jin Yue, Yilikal Ayino, Tristan K. Truttmann, Maria N. Gastiasoro, Eylon Persky, Alex Khanukov, Dooyong Lee, Laxman R. Thoutam, Beena Kalisky, Rafael M. Fernandes, Vlad S. Pribiag, Bharat Jalan
Summary: Using hybrid MBE, high-quality SrTiO₃ films with low defect density were obtained, and their transport properties were studied. The dominant influence of intraband scattering at the second Lifshitz transition was observed, along with the anomalous temperature dependence of the Hall scattering factor and carrier density due to the antiferrodistortive transition.
Article
Materials Science, Multidisciplinary
Tian -Yu Jing, Zi-Yan Han, Zhi-Hao He, Ming-Xin Shao, Peng Li, Zhi-Qing Li
Summary: We investigated the low-temperature transport properties of NbN epitaxial films with different thicknesses. Two-dimensional (2D) superconductivity and a superconductor-insulator transition (SIT) were observed in films with thickness ranging from 2.0 to 4.0 nm. A magnetic-field-driven SIT was also observed in these 2D superconducting films. Both 2D and quasi-three-dimensional (quasi-3D) superconducting films showed wide regions of crossing low-temperature magnetoresistance isotherms. The divergent dynamical critical exponent near the critical point suggests the occurrence of quantum Griffiths singularity in both 2D and quasi-3D superconductors.
Article
Multidisciplinary Sciences
Su Jae Kim, Yong In Kim, Bipin Lamichhane, Young-Hoon Kim, Yousil Lee, Chae Ryong Cho, Miyeon Cheon, Jong Chan Kim, Hu Young Jeong, Taewoo Ha, Jungdae Kim, Young Hee Lee, Seong-Gon Kim, Young-Min Kim, Se-Young Jeong
Summary: Oxidation can deteriorate the properties of copper, especially in the semiconductor industry and electro-optics applications. This study explores copper oxidation and proposes a strategy to prevent oxidation by using copper thin films with flat surfaces and occasional mono-atomic steps. The exceptional oxidation resistance of these ultraflat Cu surfaces is explained by the imperviousness of mono-atomic step edges to oxygen.
Article
Crystallography
Atsushi Kobayashi, Kohei Ueno, Hiroshi Fujioka
Summary: The study found that the 7-nm-thick NbN film grown on AlN/sapphire substrate exhibited high crystallinity and a superconducting transition temperature of 11 K, making it suitable for superconducting single-photon detectors.
JOURNAL OF CRYSTAL GROWTH
(2021)
Article
Chemistry, Multidisciplinary
Christian Martella, Davide Campi, Pinaka Pani Tummala, Erika Kozma, Paolo Targa, Davide Codegoni, Marco Bernasconi, Alessio Lamperti, Alessandro Molle
Summary: A chemical vapor deposition approach utilizing the surfactant effects of organic molecules is used to grow atomically thin layers of MoS2 on nanopatterned substrates, adapting to the local substrate curvature through shear and slip mechanisms. This study reveals the role of perylene-based molecules in promoting layer adhesion to the substrate.
Article
Materials Science, Multidisciplinary
Xiucheng Wei, Pinku Roy, Zihao Yang, Di Zhang, Zihao He, Ping Lu, Olivia Licata, Haiyan Wang, Baishakhi Mazumder, Nag Patibandla, Yong Cao, Hao Zeng, Mingwei Zhu, Quanxi Jia
Summary: This study achieved high-quality ultrathin epitaxial NbN films using PVD technology at low temperatures, opening up new possibilities for quantum devices. The research revealed a close correlation between film thickness and superconducting properties, with lattice strain observed in films below 20 nm.
MATERIALS RESEARCH LETTERS
(2021)
Article
Chemistry, Physical
Vasily S. Stolyarov, Stephane Pons, Sergio Vlaic, Sergey Remizov, Dmitriy S. Shapiro, Christophe Brun, Sergey Bozhko, Tristan Cren, Tatiana Menshchikova, Evgueni Chulkov, Walter Pogosov, Yuriy E. Lozovik, Dimitri Roditchev
Summary: The superconducting nanohybrids formed by Pb on the surface of Bi2Te3 exhibit a thickness-dependent superconducting gap for Pb-islands and a position-independent proximity gap. The wetting layer of Pb leads to modifications of electronic states of Bi2Te3, resulting in a long-range proximity effect.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Filippo Franceschini, Maria Recaman Payo, Koen Schouteden, Jon Ustarroz, Jean Pierre Locquet, Irene Taurino
Summary: Reliable and microchip-compatible approaches to catalyst development for non-enzymatic glucose sensing using thin films of VOx on glassy carbon electrodes are reported. The electrochemical behavior of the VOx films and partial etching during polarization are examined, and a mechanistic description of the electrochemical process is proposed. The sensors show a wide linear range, good sensitivity, and a low limit of detection, making them promising for energy-efficient integrated electrochemical sensors and non-enzymatic glucose sensing.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ivan Yakovlev, Ivan Tarasov, Anna Lukyanenko, Mikhail Rautskii, Leonid Solovyov, Alexander Sukhachev, Mikhail Volochaev, Dmitriy Efimov, Aleksandr Goikhman, Ilya Bondarev, Sergey Varnakov, Sergei Ovchinnikov, Nikita Volkov, Anton Tarasov
Summary: In this study, Mn5Ge3 epitaxial thin films were successfully synthesized on Si(111) substrates by co-deposition of Mn and Ge. The highly ordered growth mode was stabilized by adjusting the evaporation rate of Mn and Ge. The lattice parameters of the films were close to the bulk values and exhibited two azimuthal crystallite orientations. A double buffer layer model was proposed to explain the elimination of lattice mismatch between Si and Mn5Ge3 film.
Article
Chemistry, Physical
Christoph Baeumer, Jiang Li, Qiyang Lu, Allen Yu-Lun Liang, Lei Jin, Henrique Perin Martins, Tomas Duchon, Maria GloEss, Sabrina M. Gericke, Marcus A. Wohlgemuth, Margret Giesen, Emily E. Penn, Regina Dittmann, Felix Gunkel, Rainer Waser, Michal Bajdich, Slavomir Nemsak, J. Tyler Mefford, William C. Chueh
Summary: The composition of LaNiO3 thin film surfaces dictates surface transformation and the activity of the oxygen evolution reaction, with Ni termination being significantly more active than La termination in the initial state. Active surface phases only develop for select as-synthesized surface terminations.
Article
Nanoscience & Nanotechnology
Lian Li, Qiang Zou, Basu Dev Oli, Huimin Zhang, Joseph Benigno, Xin Li
Summary: Scanning tunneling microscopy (STM) is used to image atomic structure and determine local elemental composition, chemical bonding, and electronic excitations. Machine learning is applied to analyze STM data and identify hidden patterns and correlations in multicomponent alloys. In this study, the Se/S concentration in single-layer FeSe1-xSx alloys is determined using K-means clustering and singular value decomposition methods. This analysis provides an efficient and reliable determination of alloy composition and reveals the correlations between nanoscale chemical inhomogeneity and superconductivity in iron chalcogenide films.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
S. Leith, M. Vogel, J. Fan, E. Seiler, R. Ries, X. Jiang
Summary: In recent years, researchers have shown increased interest in alternatives to bulk Nb for superconducting radio frequency (SRF) cavities, particularly focusing on thin films of Nb or other high T-c materials. Recent insights into the potential of single layer high -kappa materials have sparked additional research in this area.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Yuto Kajino, Kohei Sakanashi, Nobuyuki Aoki, Kenji Watanabe, Takashi Taniguchi, Kenichi Oto, Yasuhiro Yamada
Summary: Monolayer materials are significantly influenced by potential fluctuations induced by intrinsic corrugation or substrate surface roughness. The effective exciton-exciton annihilation (EEA) rate constants of monolayer WS2 on substrates with atomically flat terraces deviate from the overall tendency and exhibit multiple exciton decay components. It is crucial to use a quantized EEA model for a correct description, as the intrinsic EEA rate constants for the flat-terrace substrates are comparable to hBN-encapsulated monolayer WS2.
Article
Chemistry, Multidisciplinary
Xiao-Ang Nie, Shujing Li, Meng Yang, Zhen Zhu, Hao-Ke Xu, Xu Yang, Fawei Zheng, Dandan Guan, Shiyong Wang, Yao-Yi Li, Canhua Liu, Jian Li, Ping Zhang, Youguo Shi, Hao Zheng, Jinfeng Jia
Article
Physics, Multidisciplinary
Chengwei Wang, Meixiao Wang, Juan Jiang, Haifeng Yang, Lexian Yang, Wujun Shi, Xiaofang Lai, Sung-Kwan Mo, Alexei Barinov, Binghai Yan, Zhi Liu, Fuqiang Huang, Jinfeng Jia, Zhongkai Liu, Yulin Chen
Article
Physics, Multidisciplinary
Chenxiao Zhao, Mengli Hu, Jin Qin, Bing Xia, Canhua Liu, Shiyong Wang, DanDan Guan, Yaoyi Li, Hao Zheng, Junwei Liu, Jinfeng Jia
PHYSICAL REVIEW LETTERS
(2020)
Article
Materials Science, Multidisciplinary
Zhen Zhu, Si Li, Meng Yang, Xiao-Ang Nie, Hao-Ke Xu, Xu Yang, Dan-Dan Guan, Shiyong Wang, Yao-Yi Li, Canhua Liu, Zhi-Qiang Mao, Nan Xu, Yugui Yao, Shengyuan A. Yang, You-Guo Shi, Hao Zheng, Jin-Feng Jia
NPJ QUANTUM MATERIALS
(2020)
Article
Multidisciplinary Sciences
Yuqiang Zheng, Can Li, Chengyang Xu, Doreen Beyer, Xinlei Yue, Yan Zhao, Guanyong Wang, Dandan Guan, Yaoyi Li, Hao Zheng, Canhua Liu, Junzhi Liu, Xiaoqun Wang, Weidong Luo, Xinliang Feng, Shiyong Wang, Jinfeng Jia
NATURE COMMUNICATIONS
(2020)
Article
Physics, Condensed Matter
Hai-Yang Ma, Dandan Guan, Shiyong Wang, Yaoyi Li, Canhua Liu, Hao Zheng, Jin-Feng Jia
Summary: Based on first-principle calculations, the van der Waals layered compound Ti2Te2O is predicted to possess both the quantum anomalous Hall (QAH) and magnetic quantum spin Hall (QSH) states, depending on the magnetic order in its single layer. This research opens up new possibilities for achieving a controllable phase transition between two topological nontrivial phases through magnetism tailoring.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Physics, Applied
Zhen Zhu, Hao Zheng, Jin-feng Jia
Summary: The Majorana zero mode, a bound state of Majorana fermion in condensed matter, plays a critical role in fault-tolerant topological quantum computation. By using molecular beam epitaxy, artificially engineered topological superconductors such as Bi2Se3/NbSe2 and Bi2Te3/NbSe2 heterostructures can exhibit both topological phase and superconductivity simultaneously. Low-temperature scanning tunneling microscope has revealed several characteristic features of Majorana zero mode in the vortex, corroborated by theoretical results, paving the way for further applications in topological quantum computing.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Mechanics
A. D. Lai, J. F. Jia, J. L. Qu, J. Y. Wang, J. B. Sun, Z. H. Zhou, X. S. Xu, C. W. Lim
Summary: This study investigates the influence of local thinning thickness defects on the buckling of cylindrical shells. A static buckling model is established based on the Hamiltonian system, and the complete symplectic eigensolutions are superimposed to derive the buckling modes of the cylindrical shell with defects. The influence of different defect shapes on the shell's buckling is analyzed by constraining the defect volume, and it is concluded that defects of exponential function are more harmful.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Physics, Multidisciplinary
Chen Liu, Yinong Zhou, Guanyong Wang, Yin Yin, Can Li, Haili Huang, Dandan Guan, Yaoyi Li, Shiyong Wang, Hao Zheng, Canhua Liu, Yong Han, James W. Evans, Feng Liu, Jinfeng Jia
Summary: After depositing Bi on InSb(111)B, a Sierpifiski-triangle (ST)-like structure is observed in Bi thin films, which turns off the intrinsic electronic topology. The formation of ST-like islands is driven by the relaxation of a large misfit strain between the Bi adlayer and substrate. Besides a sufficiently large tensile strain, forming ST-like structures also requires larger adlayer-substrate and intra-adlayer elastic stiffnesses, and weaker intra-adlayer interatomic interactions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Hai-Yang Ma, Mengli Hu, Nana Li, Jianpeng Liu, Wang Yao, Jin-Feng Jia, Junwei Liu
Summary: The study introduces a new type of spin-valley locking enabled by crystalline symmetry, allowing for the generation of valley polarizations, net magnetization, and non-collinear spin currents, providing new possibilities for multifunctional antiferromagnetic materials.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Applied
Hai-Yang Ma, Dandan Guan, Shiyong Wang, Yaoyi Li, Canhua Liu, Hao Zheng, Jin-Feng Jia
Summary: This letter proposes a novel approach for realizing the braiding operations of Majorana zero modes in topological superconductors, by building arrays of electrically controllable pinning centers beneath the thin film instead of on top. This method increases the braiding rate and enables electrically controllable braiding, paving the way towards large-scale topological quantum computation.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Yin Yin, Guanyong Wang, Chen Liu, Haili Huang, Jiayi Chen, Jiaying Liu, Dandan Guan, Shiyong Wang, Yaoyii Li, Canhua Liu, Hao Zheng, Jinfeng Jia
Summary: A moire superlattice has been discovered in topological insulators, showing a periodic modulation on the electronic structure. This study demonstrates that the rotation angles between Sb2Te3 film and graphene substrate can be strongly influenced by substrate temperature, leading to different moire patterns with varying levels of complexity. Comparing dI/dV curves from Sb2Te3 films with different moire patterns suggests that the superstructure can provide degrees of freedom in modifying electronic structure, stimulating further research on the moire modulation in topological insulators.
Article
Physics, Multidisciplinary
Yunlong Li, Zhao Ran, Chaozhi Huang, Guanyong Wang, Peiyue Shen, Haili Huang, Chunqiang Xu, Yi Liu, Wenhe Jiao, Wenxiang Jiang, Jiayuan Hu, Gucheng Zhu, Chenhang Xu, Qi Lu, Guohua Wang, Qiang Jing, Shiyong Wang, Zhiwen Shi, Jinfeng Jia, Xiaofeng Xu, Wentao Zhang, Weidong Luo, Dong Qian
Summary: By combining various experimental and computational techniques, the low-energy band structure, atomic structure, and charge polarization on the surface of a topological semimetal candidate TaNiTe5 have been studied. Dirac-like surface states and switchable ferroelectric-like polarization were observed, and the noncentrosymmetric surface relaxation was proposed as the origin of the observed ferroelectric-like state in this novel material.
PHYSICAL REVIEW LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Kai Liu, Jian Zheng, Yating Sha, Bosai Lyu, Fengping Li, Youngju Park, Yulu Ren, Kenji Watanabe, Takashi Taniguchi, Jinfeng Jia, Weidong Luo, Zhiwen Shi, Jeil Jung, Guorui Chen
Summary: Interactions among charge carriers in graphene can lead to the spontaneous breaking of multiple degeneracies. In this study, the stacking orders of tetralayer graphene devices were determined using near-field infrared imaging. Through quantum transport measurements, a range of spontaneous broken-symmetry states and their transitions were observed, which could be finely tuned by carrier density and electric displacement field. These findings highlight the potential of multilayer graphene as a platform for investigating broken symmetries.
NATURE NANOTECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Zhiwei Wang, Yu-Xiao Jiang, Jia-Xin Yin, Yongkai Li, Guan-Yong Wang, Hai-Li Huang, Shen Shao, Jinjin Liu, Peng Zhu, Nana Shumiya, Md Shafayat Hossain, Hongxiong Liu, Youguo Shi, Junxi Duan, Xiang Li, Guoqing Chang, Pengcheng Dai, Zijin Ye, Gang Xu, Yanchao Wang, Hao Zheng, Jinfeng Jia, M. Zahid Hasan, Yugui Yao
Summary: This study reports the observation of electronic chiral charge order in CsV3Sb5 using scanning tunneling microscopy (STM). The research reveals the unique electronic nature of the chiral charge order, as well as the formation of domain walls in the 1 x 4 superlattice, possibly as a surface effect. Additionally, clean-limit superconductivity is observed through vortex core bound states within the superconducting energy gap under a c-axis magnetic field.
