Article
Materials Science, Multidisciplinary
Tatsuya Miki, Shun-Ta Tamura, Shoma Iimura, Shintaro Hoshino
Summary: The disorder and interaction effects on Bogoliubov-Fermi surfaces with preserved inversion symmetry are studied, showing that nonideal Bogoliubov quasiparticles induce odd-frequency pair amplitude and self-energy contribution mainly from disorder effects. Two kinds of solutions are found depending on parameters, with characteristic self-energy structures reflected in the single-particle spectrum. The odd-frequency pairing of bogolons is mainly composed of electrons' odd-frequency pairing in the concrete fermion model.
Article
Materials Science, Multidisciplinary
Devi V. Ambika, Qing-Ping Ding, Khusboo Rana, Corey E. Frank, Elizabeth L. Green, Sheng Ran, Nicholas P. Butch, Yuji Furukawa
Summary: This study presents the coexistence of ferromagnetic and antiferromagnetic spin fluctuations in UTe2, as revealed by Te-125 nuclear magnetic resonance studies. The dominant ferromagnetic spin fluctuations are found within ladders, while the antiferromagnetic spin fluctuations originate from interladder magnetic coupling. Despite the presence of antiferromagnetic spin fluctuations, the ferromagnetic spin fluctuations in ladders may play an important role in the appearance of the spin-triplet superconducting state in UTe2.
Article
Materials Science, Multidisciplinary
Xiangwei Huang, Chunyu Guo, Carsten Putzke, Martin Gutierrez-Amigo, Yan Sun, Maia G. Vergniory, Ion Errea, Dong Chen, Claudia Felser, Philip J. W. Moll
Summary: The cascade of electronic phases in CsV3Sb5 provides an opportunity to study the mutual interactions in a clean, strongly interacting kagome lattice. CsV3Sb5 is a three-dimensional metal in the charge density wave state and exhibits anomalous magnetoresistance at low temperatures.
Article
Physics, Multidisciplinary
Dai Aoki, Hironori Sakai, Petr Opletal, Yoshifumi Tokiwa, Jun Ishizuka, Youichi Yanase, Hisatomo Harima, Ai Nakamura, Dexin Li, Yoshiya Homma, Yusei Shimizu, Georg Knebel, Jacques Flouquet, Yoshinori Haga
Summary: This study reports the first observation of the de Haas-van Alphen (dHvA) effect in the novel spin-triplet superconductor UTe2. The researchers found that UTe2 has two types of cylindrical Fermi surfaces with strong corrugation, and the angular dependence of the dHvA frequencies is in good agreement with the calculated results.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Materials Science, Multidisciplinary
Shan Zhao, Bin Liu, Yi-feng Yang, Shiping Feng
Summary: Recent observations of two nodeless gaps in superconducting CeCu2Si2 have sparked intense debates over its exact gap structure, either sign-reversal (s+-) or sign-preserving (s++) pairing. In this study, we investigate the quasiparticle interference (QPI) using realistic Fermi surface topology and find qualitative distinctions between s+- and s++ pairing states, providing important insights into the true pairing symmetry in the material.
Article
Materials Science, Multidisciplinary
Carsten Timm, Ankita Bhattacharya
Summary: Multiband effects in solids can result in fundamentally different electronic behavior, such as the emergence of Fermi surfaces in superconductors that break time-reversal symmetry. This study extends the analysis to include nonlocal pairing and consider internal degrees of freedom, focusing on even-parity pairing and providing symmetry analysis for several examples. The inclusion of nonlocal pairing expands the range of possible pairing symmetries, with a simple criterion for nodes in terms of form factor scalar products.
Article
Materials Science, Multidisciplinary
Jiahao Hao, Wenshan Hong, Xiaoxiang Zhou, Ying Xiang, Yaomin Dai, Huan Yang, Shiliang Li, Huiqian Luo, Hai-Hu Wen
Summary: The optical properties of KCa2Fe4As4F2 and KCa2(Fe0.95Ni0.05)(4)As4F2 have been studied, and nodeless superconducting gaps are observed in both samples. However, the superconducting gap in K12442 suggests strong-coupling Cooper pairs, while in Ni-K12442, it supports the BCS weak-coupling pairing state. Additionally, a pseudogap is observed in K12442 at higher temperatures, while no such behavior is detected in Ni-K12442.
Article
Physics, Multidisciplinary
Pan Nie, Huakun Zuo, Lingxiao Zhao, Zengwei Zhu
Summary: This study investigates the fermiology, electrical anisotropy, and Fermi liquid properties of the layered ternary boride MoAlB. Multiple methods were used to reveal the electronic bands in this system and observe a large out-of-plane electrical anisotropy. Calculations show that the Fermi liquid behavior differs between the in-plane and out-of-plane directions, indicating the need for further exploration.
CHINESE PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Bradraj Pandey, Rahul Soni, Ling-Fang Lin, Gonzalo Alvarez, Elbio Dagotto
Summary: This study investigates the doped two-orbital Hubbard model for the two-leg ladder BaFe2S3 and shows that hole doping can lead to incommensurate magnetic ordering. Depending on the Hubbard U coupling strength, different magnetic patterns may be stabilized. The study also suggests that tight hole pairs, primarily in one orbital, continue to form with increasing hole density as long as the magnetic order remains antiferromagnetic in one direction.
Article
Physics, Multidisciplinary
Paramita Dutta, Fariborz Parhizgar, Annica M. Black-Schaffer
Summary: The possible symmetries of the superconducting pair amplitude are related to the fermionic nature of Cooper pairs. While spin-1/2 systems are classified using SPOT = -1, higher spin fermions are classified using JPT = -1. Recent research on spin-3/2 superconductors suggests they may exhibit a Bogoliubov Fermi surface and finite odd-frequency pair amplitudes.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Qiang Cheng, Qing Yan, Qing-Feng Sun
Summary: Our study reveals that the Josephson effect in spin-triplet superconductor-quantum anomalous Hall insulator-spin-triplet superconductor junctions strongly depends on the orientations of the d vectors in superconductors, showing different effects for different configurations.
Article
Materials Science, Multidisciplinary
Vladimir A. Zyuzin, Alexander M. Finkel'stein
Summary: In this study, we consider a two-dimensional disordered conductor in the presence of a magnetic field that destroys the superconducting phase. By analyzing a combination of fluctuations of different origin, we observe that the end of superconductivity corresponds to a quantum critical point separating the conventional superconducting phase from a state with odd-frequency spin-triplet pairing instability. This finding may provide insights into the mysterious insulating state observed in strongly disordered superconducting films across a wide range of magnetic fields.
Article
Physics, Multidisciplinary
Xiao-Cheng Bai, Wen-Feng Wu, Han-Yu Wang, Ya-Min Quan, Xianlong Wang, Zhi Zeng, Liang-Jian Zou
Summary: In this work, an effective six-band model is constructed for CsV3Sb5 compounds and the pairing symmetry is investigated using the random phase approximation. The results indicate that the dominant pairing symmetry in CsV3Sb5 is A2g (I-wave), providing insights for understanding recent experimental observations.
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Zh Devizorova, S. Mironov, A. Buzdin
Summary: We studied the effect of the triplet proximity effect on Josephson transport in superconductor/half-metal/superconductor structures of atomic thickness beyond the quasiclassical approximation. The full spin polarization inside the half-metal gives rise to a nonmonotonic temperature dependence of the critical current in the S/HM/S Josephson junction with two spin active interfaces. Magnetic moment inside the S-2 layer in the S-1/HM/S-2 structure with a spin-active interface is calculated, induced by the spin-triplet superconducting correlations.
Article
Physics, Multidisciplinary
H. A. Muluneh, G. Kahsay, T. N. Wondim
Summary: This study investigates the temperature-dependent upper critical magnetic field (H-C2) of uranium ditelluride (UTe2) superconductor using the Ginzburg-Landau (GL) phenomenological equation. The results show that the upper critical magnetic field and GL characteristic parameter decrease and vanish at the superconducting critical temperature, while the GL coherence length and penetration depth increase and go to infinity.
INDIAN JOURNAL OF PHYSICS
(2023)
Article
Chemistry, Physical
Xu Zheng, Jiao Tan, Qianqian Wang, Chan Gao, Xiaohui Yu, Wenhui Xie, Yifeng Yang, Yujie Wang, Changqing Jin
Summary: In this study, MnN single crystal was synthesized under high pressure and temperature, and a first-order phase transition accompanied by an antiferromagnetic to ferromagnetic magnetic structure transition was observed. The magnetic and structural transition of MnN was found to be induced by the enhanced ferromagnetic double exchange interactions in the [001] plane. These findings provide important insights for the development of GaMnN or MnN layer diluted magnetic semiconductor materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Physics, Condensed Matter
Yi-feng Yang
Summary: Recent advances in experimental techniques have provided new insights into heavy fermion physics. This article summarizes the author's research in this area, specifically focusing on five major topics: development of phase coherence and two-stage hybridization, two-fluid behavior and hidden universal scaling, quantum phase transitions and fractionalized heavy fermion liquid, quantum critical superconductivity, and material-specific properties. These findings go beyond conventional mean-field or local approximation-based theories, leading to an emerging global picture of heavy fermion physics.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Engineering, Industrial
Xiaoyu Yang, Liyang Xie, Yifeng Yang, Bingfeng Zhao, Yuan Li
Summary: The Weibull distribution is widely used for reliability analysis. This paper presents a simple method called the minimum discrepancy method for parameter estimation of the Weibull distribution using both complete and censored data. The study also compares thirteen methods using several criteria in a small sample size. The results recommend the generalized least square 1, the weighted least square 1, the weighted maximum likelihood estimation, and the minimum discrepancy method for parameter estimation with small samples.
QUALITY ENGINEERING
(2023)
Article
Geriatrics & Gerontology
Zhaoshun Jiang, Yuxi Cai, Songbin Liu, Pei Ye, Yifeng Yang, Guangwu Lin, Shihong Li, Yan Xu, Yangjing Zheng, Zhijun Bao, Shengdong Nie, Weidong Gu
Summary: Using machine-learning algorithms, we identified abnormal functional connectivity patterns in the default mode network (DMN) of patients with delayed neurocognitive recovery (DNR), particularly in regions involved in visual processing, suggesting that these changes could serve as potential biomarkers for predicting DNR.
FRONTIERS IN AGING NEUROSCIENCE
(2023)
Article
Polymer Science
Chengpeng Li, Yanting Shi, Huixin Su, Yifeng Yang, Wen Li, Tong Zhang, Weiyin Chen, Roujun Lin, Yongzheng Li, Lusheng Liao
Summary: Siloxane elastomers were enhanced with multi-strength hydrogen bonds and dynamic disulfide bonds to achieve high stretchability, mechanical strength, self-healing capacity, and recyclability. The ratio of hydrogen bonding networks was adjusted to tune the mechanical properties and self-healing efficiency of the elastomers. The introduction of aromatic disulfide resulted in significantly improved tensile strength, strain, and toughness, with a healing efficiency of 75%. A self-healing flexible bifunctional sensor was also developed using liquid metal alloy encapsulated between the elastomers layers for pressure and motion detection.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Engineering, Civil
Xiaoyu Yang, Liyang Xie, Jiaxin Song, Jianpeng Chen, Bingfeng Zhao, Yifeng Yang
Summary: In this paper, an optimal probability estimator for Weibull parameters is obtained through Monte Carlo simulations, and it is found to exhibit stronger robustness and higher accuracy compared to five commonly used estimators, especially in cases of small sample sizes. The recommended optimal probability estimator is the midpoint rank for LRE, MDE, and EIV in practical applications.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Chemistry, Physical
Bei-Lei Liu, Yue-Chao Wang, Yu Liu, Yuan-Ji Xu, Xin Chen, Hong-Zhou Song, Yan Bi, Hai-Feng Liu, Hai-Feng Song
Summary: This study investigates the factors affecting the effective Coulomb interaction strength in lanthanide metals and compares the results obtained using LSCC, LR, and cRPA methods. It is found that LSCC is mainly influenced by orbital localization, cRPA is mainly influenced by screening effect, and LR shows a balance between the two factors. Additionally, the performance of these methods is affected by different starting points, especially for cRPA.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Dongchen Huang, Junde Liu, Tian Qian, Yi-Feng Yang
Summary: De-noising is crucial in spectrum post-processing. In this study, we propose a de-noising method for angle-resolved photoemission spectroscopy (ARPES) to extract intrinsic spectral information without a training set. Our method utilizes the self-correlation information of the spectra themselves, preserving the intrinsic energy band features for further analysis and processing. It has the potential to be extended to other fields and application scenarios with challenging training data acquisition.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Multidisciplinary Sciences
Haifeng Yang, Jingjing Gao, Yingying Cao, Yuanji Xu, Aiji Liang, Xiang Xu, Yujie Chen, Shuai Liu, Kui Huang, Lixuan Xu, Chengwei Wang, Shengtao Cui, Meixiao Wang, Lexian Yang, Xuan Luo, Yuping Sun, Yi-feng Yang, Zhongkai Liu, Yulin Chen
Summary: Mott physics plays a critical role in materials with strong electronic correlations. The transition from Mott insulator to metal in transition metal oxides is mainly driven by chemical doping, external pressure, temperature, and gate voltage, while in 4f-electron systems, it is mainly driven by Kondo hybridization. However, in YbInCu4, an unusual Mott instability is found to accompany its first-order valence transition, challenging the prevalent Kondo picture. This work provides important insight into the understanding and manipulation of correlated quantum phenomena in the f-electron system.
NATIONAL SCIENCE REVIEW
(2023)
Article
Multidisciplinary Sciences
Hanghui Chen, Yi-feng Yang, Guang-Ming Zhang, Hongquan Liu
Summary: In this study, first-principles calculations are used to demonstrate a charge-transfer-driven charge order mechanism in infinite-layer nickelates, resulting in a characteristic stripe state. The stability of this charge order arises from the competition between Hubbard interaction on Ni-d orbitals and charge transfer energy between Ni-d orbitals and conduction bands.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Yuzhu Song, Tiankuo Xu, Guoping Zhao, Yuanji Xu, Zhicheng Zhong, Xinqi Zheng, Naike Shi, Chang Zhou, Yiqing Hao, Qingzhen Huang, Xianran Xing, Ying Zhang, Jun Chen
Summary: This study discovers a method to form high-density, spontaneous magnetic biskyrmions in ferrimagnets, which can exist within a wide temperature range. The strong connection between the atomic-scale ferrimagnetic structure and nanoscale magnetic domains is revealed, and the critical role of negative thermal expansion in generating biskyrmions is demonstrated.
Article
Multidisciplinary Sciences
Jiangfan Wang, Yi-feng Yang
Summary: Understanding the nature of local-itinerant transition of strongly correlated electrons is a central problem in condensed matter physics. A solvable Kondo-Heisenberg model is proposed to investigate this issue, which reveals the continuous evolution of Fermi surfaces and two-fluid behaviors, providing important insight into the microscopic description of two-fluid phenomenology in heavy fermion systems.
Article
Materials Science, Multidisciplinary
Shuai-Kang Zhang, Zhao-Yi Zeng, Yuan-Ji Xu, Xiang-Rong Chen, Guang-Fu Ji
Summary: In this study, the surface electronic structures of CeCo2P2 with P- and Ce-terminated layer structures were investigated using density functional theory (DFT) and DFT+dynamical mean field theory method. The results showed that the surface states of the paramagnetic P-terminated slab exhibited heavy-fermion behavior, and the surface Ce-4f5/2 band in the P-terminated slab was closer to the Fermi level (EF) than that in bulk, hybridizing with Co-3d conductive bands. However, the surface Ce of the Ce-terminated slab was closer to the atomic state with lower hybridization strength, leading to a weaker Kondo resonance peak near EF.
Article
Materials Science, Multidisciplinary
Junde Liu, Dongchen Huang, Yi-feng Yang, Tian Qian
Summary: Spectroscopic data often contains unwanted extrinsic signals. A deep learning method is proposed in this study to effectively overcome this problem by utilizing the self-correlation information within the spectra. This method can remove the grid structure and noise while optimizing the quality of the spectra, potentially enhancing spectral measurements in various spectroscopic experiments.
