Article
Chemistry, Physical
A. S. Tarasov, D. V. Ishchenko, I. O. Akhundov, V. A. Golyashov, A. E. Klimov, S. P. Suprun, E. V. Fedosenko, V. N. Sherstyakova, A. G. Rybkin, O. Yu. Vilkov, O. E. Tereshchenko
Summary: This study investigated the effects of surface treatment on Pb1-xSnxTe In In (1 1 1) surface in HCl-isopropanol solution, revealing the removal of native oxides and surface enrichment by elemental tellurium, as well as subsequent desorption of tellurium and restoration of (1x1) surface structure. Angle resolved photoemission spectroscopy (ARPES) measurements on MBE-grown films of Pb1-xSnxTe showed Dirac-like dispersion surface states at Gamma. Dark current and photocurrent were observed depending on surface chemical procedure and composition, pointing towards potential applications in TCI research.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Zhiyong Yu, Wenqiao Han, Zengji Yue, Boyuan Cai, Zhengfen Wan, Hua Lu, Khay See, Zhenxiang Cheng, Min Gu, Songbai Hu
Summary: This study demonstrated the photo-electrochemical properties of a typical topological insulator material, Sb2Te3 thin film. The Sb2Te3 thin films were grown on a glass substrate using atomic layer deposition and characterized using various techniques. The as-fabricated Sb2Te3 thin films showed continuous and coarse surfaces with high crystallization, and exhibited potential for photocatalytic water splitting application.
Article
Chemistry, Multidisciplinary
Liguo Zhang, Toni Helm, Haicheng Lin, Fengren Fan, Congcong Le, Yan Sun, Anastasios Markou, Claudia Felser
Summary: The study demonstrates that doping with vanadium can effectively modify the band structure in magnetic topological insulators, leading to the enhancement of SdH oscillations and the induction of long-range ferromagnetic order. The angle-dependent SdH oscillations reveal their 2D nature and their connection to topological surface states. This tunability by doping and the coexistence of surface states with ferromagnetism highlight the potential of Sb2-xVxTe3 thin films in energy band engineering for quantum electronics and spintronics design.
ADVANCED MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Hak Dong Cho, Juwon Lee, Deuk Young Kim, Sung Yun Chung, Jong-Kwon Lee
Summary: High-quality Bi2Se3 thin films with topological insulating properties are grown on a patterned sapphire substrate (PSS), showing enhanced light absorption and high crystallinity. The fabricated IR conversion device using Bi2Se3/PSS heterostructure exhibits excellent performance and high reliability. The enhanced device performance of Bi2Se3/PSS is confirmed by increased absorption spectra and improved light absorption distribution.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Yogesh Kumar, Prince Sharma, V. P. S. Awana
Summary: In this study, bismuth selenide thin films of varying thicknesses were deposited on a SiO2 substrate. The films were characterized and their transport properties were investigated, revealing the thickness dependence of weak anti-localization effect in Bi2Se3/SiO2 thin films.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Physics, Multidisciplinary
Wei-Xiong Wu, Yang Feng, Yun-He Bai, Yu-Ying Jiang, Zong-Wei Gao, Yuan-Zhao Li, Jian-Li Luan, Heng-An Zhou, Wan-Jun Jiang, Xiao Feng, Jin-Song Zhang, Hao Zhang, Ke He, Xu-Cun Ma, Qi-Kun Xue, Ya-Yu Wang
Summary: We report transport measurements on Josephson junctions consisting of Bi2Te3 topological insulator thin films contacted by superconducting Nb electrodes. The critical supercurrent can be modulated by an electrical gate, indicating different transport properties in p-type and n-type regimes.
CHINESE PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Iciar Arnay, Aida Serrano, Veronica Braza, Rosalia Cid, Ana M. Sanchez, Jsus Lopez-Sanchez, German R. Castro, Juan Rubio-Zuazo
Summary: This paper reports on the growth of epitaxial Fe3Si ultra-thin films by pulsed laser deposition on SrTiO3(001) substrates and analyzes the effect of deposition temperature on the structural, morphological, and magnetic properties of the films. The results show that the best magnetic response is achieved at 200°C, which represents the optimal compromise between phase purity and interface quality.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
K. H. M. Chen, K. Y. Lin, S. W. Lien, S. W. Huang, C. K. Cheng, H. Y. Lin, C-H Hsu, T-R Chang, C-M Cheng, M. Hong, J. Kwo
Summary: Topological material α-Sn exhibits rich topological phases and its band structure is influenced by strain and confinement effects. Researchers found that the gapped surface states of α-Sn transformed into linearly dispersive TSS at a critical thickness of 6 bilayers (BL), indicating a phase transition from trivial to nontrivial. Additional Rashba-like surface states (RSS) were identified in films thicker than 30 BL, serving as preformed TSS in another strain-induced topological phase transition. In thick films of 370 BL, α-Sn displayed a Dirac semimetal phase with Dirac nodes located along Gamma-Z. This thickness-dependent band structure study deepens the understanding of topological phase transitions and the evolution of Dirac states, and the coexistence of TSS and RSS in α-Sn may significantly enhance its potential for spintronic applications.
Article
Physics, Multidisciplinary
Rui Chen, Tianyu Liu, C. M. Wang, Hai-Zhou Lu, X. C. Xie
Summary: The paper discusses the Fermi-arc mechanism of the 3D quantum Hall effect in Weyl semimetals and proposes a method to achieve one-sided hinge states in Cd3As2-like Dirac semimetals using a tilted magnetic field. Additionally, a new experimental approach to detect these one-sided hinge states is suggested.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
A. Crespo, J. Gallenberger, M. De Santis, V. Langlais, F. Carla, J. M. Caicedo, J. Rius, X. Torrelles
Summary: The epitaxial growth and properties of anatase films deposited on SrTiO3 single crystals have been studied. The strain evolution, lattice parameters, and annealing effects were investigated. Pulsed laser deposition films grew into square islands that aligned with the substrate lattice directions. Film annealing melted the islands into flat terraces, with larger terraces achieved at higher temperatures. The growth process allowed control of surface terrace size and stoichiometry, making these films suitable for various applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Ceramics
Shuanghao Wu, Liuxue Xu, Kun Zhu, Baijie Song, Hao Yan, Bo Shen, Jiwei Zhai
Summary: The control of grain orientation and enhancement of piezoelectric and ferroelectric properties in thin films were achieved by introducing Nb-doped SrTiO3 single crystalline substrates. Consequently, Nb-doped SrTiO3 substrates facilitated the growth of oriented thin films with larger piezoelectric coefficient, energy storage density, and efficiency, promising broad application prospects.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Fei Wang, Yi-Fan Zhao, Zi-Jie Yan, Deyi Zhuo, Hemian Yi, Wei Yuan, Lingjie Zhou, Weiwei Zhao, Moses H. W. Chan, Cui-Zu Chang
Summary: In this study, we synthesized doped Bi2Te3 thin films with controlled doping concentrations using molecular beam epitaxy. By conducting magneto-transport measurements, we observed an unusual ferromagnetic response in both chromium (Cr)- and vanadium (V)-doped films, where the Curie temperature shows a local maximum at a critical doping concentration. We attribute this behavior to the dopant-concentration-induced magnetic exchange interaction, which transforms the ferromagnetism from van Vleck-type in a nontrivial magnetic topological insulator to Ruderman-Kittel-Kasuya-Yosida (RKKY)-type in a trivial diluted magnetic semiconductor. This work provides insights into the ferromagnetic properties of magnetically doped topological insulator thin films and facilitates the exploration of high-temperature quantum anomalous Hall effect.
Article
Nanoscience & Nanotechnology
Kavoos Mirabbaszadeh
Summary: The paper theoretically investigates the effects of strain and electric field on the electronic heat capacity of TCI SnTe (001) thin film, finding that the Schottky anomaly decreases with strain and electric field in different rates. However, the Schottky temperature remains consistent with strain but fluctuates with the electric field. The study confirms that the electronic heat capacity does not significantly change with strain and electric field at high temperatures due to thermal effects.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Physics, Applied
Ying Wang, Xinyu Liu, Seul-Ki Bac, Jiashu Wang, Jacek K. Furdyna, Badih A. Assaf, Maksym Zhukovskyi, Tatyana Orlova, Valeria Lauter, Neil R. Dilley, Leonid P. Rokhinson
Summary: The study reports different growth modes and corresponding magnetic properties of thin EuSe films grown on various substrates. The ordered magnetic phases include antiferromagnetic, ferrimagnetic, and ferromagnetic phases. The strong hysteresis of the antiferromagnetic-ferrimagnetic transition is observed, and the ability to grow epitaxial films on different substrates enables further investigation of interfacial exchange interactions.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Zhiwei Liu, Hongquan Liu, Jiaji Ma, Xiaoxuan Wang, Gang Li, Hanghui Chen
Summary: We provide design principles for inducing multiple topological states in oxide superlattices and show the existence of a strong topological insulator and multiple coexisting topological Dirac semi-metal states in a specific oxide superlattice.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Multidisciplinary Sciences
Jian Gou, Bingyu Xia, Xuguang Wang, Peng Cheng, Andrew Thye Shen Wee, Wenhui Duan, Yong Xu, Kehui Wu, Lan Chen
Summary: Quinary charge states of solitary defects are realized and manipulated in 2D intermetallic semiconductor, displaying unusually delocalized defect states and ultralow charging energy, suggesting possible application in charge-based qubits.
NATIONAL SCIENCE REVIEW
(2022)
Article
Chemistry, Multidisciplinary
Yizhou Liu, Nianlong Zou, Sibo Zhao, Xiaobin Chen, Yong Xu, Wenhui Duan
Summary: This research identifies silicon as an ideal candidate material for studying topological phonons. Various topological nodal lines and a novel type of topological nexus phonon are found in silicon. The symmetry analysis is also generalized to other centrosymmetric systems, revealing the presence of numerous candidate materials with topological phonons in solids.
Article
Chemistry, Multidisciplinary
Zhenhan Fang, Shaorong Duan, Haitao Liu, Zixin Hong, Hengcai Wu, Fei Zhao, Qunqing Li, Shoushan Fan, Wenhui Duan, Jiaping Wang
Summary: A strategy of lattice-reversible binary intermetallic compounds of metallic elements is proposed for flexible lithium-ion battery anode applications, providing improved active material utilization and cycle stability.
Article
Multidisciplinary Sciences
Xiangbin Cai, Zefei Wu, Xu Han, Yong Chen, Shuigang Xu, Jiangxiazi Lin, Tianyi Han, Pingge He, Xuemeng Feng, Liheng An, Run Shi, Jingwei Wang, Zhehan Ying, Yuan Cai, Mengyuan Hua, Junwei Liu, Ding Pan, Chun Cheng, Ning Wang
Summary: Researchers have developed a method to achieve nearly barrier-free electrical contacts between atomically thin transition metal dichalcogenide semiconductors and metal leads. This method increases the efficiency of carrier injection and exhibits robust ohmic behaviors across a wide temperature range. The improved performance of field-effect transistors is reflected in the low contact resistance, high field-effect mobility, and prominent transport characteristics at cryogenic temperatures. This method also allows for the local manipulation of atomic structures and electronic properties for device design.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Yunfeng You, Hei Lam, Caihua Wan, Chunlei Wan, Wenxuan Zhu, Lei Han, Hua Bai, Yongjian Zhou, Leilei Qiao, Tongjin Chen, Feng Pan, Junwei Liu, Cheng Song
Summary: This article reports the experimental observation of the anomalous Nernst effect (ANE) in an antiperovskite noncollinear antiferromagnet, Mn3SnN, which is triggered by the enhanced Berry curvature from Weyl points. By modulating strain, the ANE in the noncollinear antiferromagnet can be controlled, providing a potential class of materials for exploring Weyl physics and realizing antiferromagnetic spin caloritronics.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Multidisciplinary
Yufeng Luo, Zhenhan Fang, Shaorong Duan, Hengcai Wu, Haitao Liu, Yuxing Zhao, Ke Wang, Qunqing Li, Shoushan Fan, Zijian Zheng, Wenhui Duan, Yuegang Zhang, Jiaping Wang
Summary: The slow electrochemical reduction and chemical disproportionation of lithium disulfide (Li2S2) during the discharging process limit the reversible capacity of lithium-sulfur (Li-S) batteries, as they lead to further polysulfide dissolution and lithium sulfide generation without capacity contribution.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Zhiming Xu, Wenhui Duan, Yong Xu
Summary: In this study, we constructed a first-principles database for quantum anomalous Hall (QAH) materials and explored the microscopic mechanisms that determine their properties. We found that the Coulomb exchange, which is usually neglected, plays a strong role in a large class of QAH materials and is key to resolving experimental puzzles. Additionally, we identified simple indicators for property evaluation and suggested material design strategies to control QAH chirality and gap. This work is valuable for future research in magnetic topological physics and materials.
Article
Multidisciplinary Sciences
Shaohua Zhou, Changhua Bao, Benshu Fan, Hui Zhou, Qixuan Gao, Haoyuan Zhong, Tianyun Lin, Hang Liu, Pu Yu, Peizhe Tang, Sheng Meng, Wenhui Duan, Shuyun Zhou
Summary: Time-periodic light field has been used to manipulate quantum states in solid-state materials, cold atoms, and photonic systems. This is achieved through interaction with photon-dressed Floquet states in the strong-coupling limit, known as Floquet engineering. In this study, experimental evidence of momentum-resolved Floquet band engineering in a model semiconductor, black phosphorus, is reported using time and angle-resolved photoemission spectroscopy measurements. Strong band renormalization and light-induced dynamical gap opening are observed near the band edges under near-resonance pumping, along with the emergence of Floquet sidebands. The band renormalization shows a selection rule favoring pump polarization along the armchair direction, indicating pseudospin selectivity for Floquet band engineering enforced by lattice symmetry. This work demonstrates pseudospin-selective Floquet band engineering in black phosphorus and provides important guiding principles for Floquet engineering of semiconductors.
Article
Chemistry, Multidisciplinary
Xi Wu, Chao Ruan, Peizhe Tang, Feiyu Kang, Wenhui Duan, Jia Li
Summary: The theoretically predicted gapped surface state of antiferromagnetic topological insulator MnBi2Te4 has been experimentally observed to have a smaller or even gapless surface state, which is caused by the defects in MnBi2Te4. The study identifies antisite Mn-Bi and Bi(Mn) as dominant defects and reveals their evolution during the phase transition from MnTe/Bi2Te3 to MnBi2Te4. It is found that complete elimination of Mn(Bi) and Bi-Mn defects in MnBi2Te4 through simple annealing is almost impossible due to high migration barrier in kinetics. Moreover, increasing concentration of Mn-Bi and Bi-Mn defects in MnBi2Te4 monolayer leads to the elimination of gap in the Dirac point-related bands, explaining the experimentally unobserved large-gap surface state. The results provide insight into the theoretical understanding of the synthesized MnBi2Te4's quality and experimentally measured topological properties.
Article
Multidisciplinary Sciences
Xiaoxun Gong, He Li, Nianlong Zou, Runzhang Xu, Wenhui Duan, Yong Xu
Summary: The authors propose an E(3)-equivariant deep-learning framework for representing the density functional theory (DFT) Hamiltonian in material structures, which preserves Euclidean symmetry and allows for efficient electronic structure calculations.
NATURE COMMUNICATIONS
(2023)
Editorial Material
Nanoscience & Nanotechnology
Wenhui Duan
Article
Materials Science, Multidisciplinary
Haoyuan Zhong, Hongyun Zhang, Haoxiong Zhang, Ting Bao, Kenan Zhang, Shengnan Xu, Laipeng Luo, Awabaikeli Rousuli, Wei Yao, Jonathan D. Denlinger, Yaobo Huang, Yang Wu, Yong Xu, Wenhui Duan, Shuyun Zhou
Summary: We report the superconducting and electronic structure properties of a natural van der Waals superlattice (PbSe)(1.14)NbSe2. Anisotropic superconductivity with a higher transition temperature than monolayer NbSe2 is revealed by transport measurements. ARPES measurements reveal the two-dimensional electronic structure and charge transfer characteristics. Our study suggests that natural van der Waals superlattices can achieve intriguing properties distinct from bulk and monolayer samples.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Physical
Xiaoyu Liu, Benshu Fan, Hannes Huebener, Umberto De Giovannini, Wenhui Duan, Angel Rubio, Peizhe Tang
Summary: In this study, the manipulation of magnetism in topological materials is demonstrated using circularly polarized light through a Floquet engineering approach. With the increase of the laser field, besides the expected topological phase transition, a magnetic phase transition from ferromagnetism to paramagnetism is observed in the magnetically doped topological insulator thin film, whose critical behavior strongly depends on the quantum quenching. Unlike the equilibrium case, the non-equilibrium Curie temperatures vary for different time scales and experimental setups, not all relying on the change of topology. Our findings deepen the understanding of the relationship between topology and magnetism in the non-equilibrium regime and extend the optoelectronic device applications to topological materials.
ELECTRONIC STRUCTURE
(2023)
Article
Physics, Applied
Qichao Tian, Ziyu Wang, Wei-Min Zhao, Yong-Jie Xu, Gan Liu, Li Wang, Pengdong Wang, Li-Guo Dou, Wang Chen, Shaoen Jin, Junyu Zong, Qinghao Meng, Fan Yu, Can Wang, Xiaoxiang Xi, Fang-Sen Li, Shao-Chun Li, Junwei Liu, Yi Zhang
Summary: This study reports the growth of 1T' phase WS2 monolayer on the SrTiO3 (001) substrate using molecular beam epitaxy. Surprisingly, a large bandgap of 0.65 eV is revealed, which is abnormally larger than the theoretical expectance. Moreover, an additional near-flatband emerges in the grown monolayer 1T'-WS2, suggesting the effect of interfacial interactions.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Jizhang Wang, Hui Zeng, Wenhui Duan, Huaqing Huang
Summary: This study proposes an efficient method to detect the Neel vector in two-dimensional antiferromagnetic materials using the intrinsic nonlinear Hall effect. The results show that the nonlinear Hall effect can be accurately controlled by shifting the chemical potential, and it exhibits a 2g-periodic dependence on the Neel vector orientation. These findings provide flexible design schemes and promising material platforms for spintronic memory device applications based on two-dimensional antiferromagnets.
PHYSICAL REVIEW LETTERS
(2023)
