Article
Physics, Multidisciplinary
Dongliang Gong, Ming Yi, Meng Wang, Tao Xie, Wenliang Zhang, Sergey Danilkin, Guochu Deng, Xinzhi Liu, Jitae T. Park, Kazuhiko Ikeuchi, Kazuya Kamazawa, Sung-Kwan Mo, Makoto Hashimoto, Donghui Lu, Rui Zhang, Pengcheng Dai, Robert J. Birgeneau, Shiliang Li, Huiqian Luo
Summary: This study presents a comprehensive investigation on the nematic fluctuations in a non-superconducting iron pnictide system, revealing the crucial role of the interplay between local spins and itinerant electrons on Fermi surfaces. The results indicate that the in-plane resistivity anisotropy highly depends on the Cr dopings and the type of charge carriers, and the orbital degree of freedom may behave differently from the spin degree of freedom.
FRONTIERS IN PHYSICS
(2022)
Article
Physics, Condensed Matter
Garima Goyal, Dheeraj Kumar Singh
Summary: We investigate the existence of semimetallic spin-density wave (SDW) states in iron pnictides. It is found that the position of a pair of Dirac points with respect to the Fermi surface shows sensitivity to the orbital splitting between the d(xz) and d(yz) orbitals. In the presence of orbital splitting, the Fermi pockets not associated with the Dirac cones can be suppressed, leading to the realization of a semimetallic SDW state. The necessary conditions for coexisting Dirac semimetallic and SDW states are obtained based on the difference in slopes and orbital contents of the bands forming the Dirac cone, as well as other parameters.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Sourav Sen Choudhury, Anton B. Vorontsov
Summary: The study investigates thermal transport in a two-dimensional system with coexisting s- or d-wave superconducting and spin density wave orders, analyzing the nature of coexistence phase and the low temperature behavior of thermal conductivity. Different pairing states emerging from collinear spin density wave order show distinct heat transport signatures, depending on symmetry properties of the superconducting order parameter. The presence of stable Dirac nodal points in the coexistence phase results in finite residual heat conductivity.
Article
Physics, Applied
I. F. Llovo, D. Sonora, J. Mosqueira, S. Salem-Sugui, Shyam Sundar, A. D. Alvarenga, T. Xie, C. Liu, S-L Li, H-Q Luo
Summary: The study reports detailed magnetic relaxation and isothermal magnetization measurements in the vortex state of the 112-type iron-pnictide superconductor Ca0.82La0.18Fe0.96Ni0.04As2 with T-c of about 22 K. A well defined second magnetization peak (SMP) feature is observed below T-c for measurements with H parallel to c-axis, while the feature is suppressed at low temperatures when H is parallel to ab-planes. Rigorous analysis suggests an elastic to plastic pinning crossover across H-p, accompanied by a possible phase transition in vortex lattice near H-p. The dominant sources of pinning are likely point disorder and surface defects, contributing to delta l-type pinning in the sample, with a high J(c) exceeding 10(5) A cm(-2) observed.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Maria Teresa Mercaldo, Carmine Ortix, Francesco Giazotto, Mario Cuoco
Summary: The breaking of time-reversal and point-group spatial symmetries can profoundly affect superconductivity. This study explores the formation and stability of vortices with angular momentum in two-dimensional spin-singlet superconductors, revealing their spatial distribution. These findings have important implications for experimental detection.
Article
Physics, Multidisciplinary
Xiaochen Hong, Steffen Sykora, Federico Caglieris, Mahdi Behnami, Igor Morozov, Saicharan Aswartham, Vadim Grinenko, Kunihiro Kihou, Chul-Ho Lee, Bernd Buechner, Christian Hess
Summary: A systematic elastoresistance study of isovalent- and electron-doped KFe2As2 crystals revealed divergent elastoresistance along their [110] direction upon cooling. The increased nematicity could be associated with another electronic criticality.
FRONTIERS IN PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
M. H. Tang, C. H. Dong, Z. T. Xu, C. Liu, P. Yang, C. Tu, W. W. Guo, Y. C. Zhu, C. Yao, H. Huang, D. L. Wang, X. P. Zhang, Y. W. Ma
Summary: In this paper, a comparative investigation on the differences of vortex dynamics in Ba(Fe0.94Co0.06)2As2 single crystal, grain oriented polycrystal, and random oriented powder is conducted. It is found that the introduction of strong pins in the polycrystal effectively reduces the magnetization relaxation rates in the low magnetic field regime.
MATERIALS TODAY PHYSICS
(2022)
Article
Multidisciplinary Sciences
P. Lopes, Shyam Sundar, S. Salem-Sugui, Wenshan Hon, Huiqian Luo, L. Ghivelder
Summary: Magnetization measurements were performed on KCa2Fe4As4F2, an anisotropic bilayer pnictide superconductor with Tc≈34 K. A second magnetization peak (SMP) was observed below 16 K, suggesting the emergence of Josephson vortices. Vortex dynamics study revealed that the SMP can be explained by elastic pinning to plastic pinning crossover. Disorder caused by point defects contributed to pinning, and the material showed potential for high magnetic field applications.
SCIENTIFIC REPORTS
(2022)
Article
Multidisciplinary Sciences
K. Komedera, J. Gatlik, A. Blachowski, J. Zukrowski, D. Rybicki, A. Delekta, M. Babij, Z. Bukowski
Summary: Investigation of EuFe2-xNixAs2 compounds with 3d and/or 4f magnetic order was done using Fe-57 and Eu-151 Mossbauer spectroscopy. The study found that Ni-substitution suppresses the spin-density wave order of Fe moments, while Eu localized moments still order with a spin reorientation as Ni concentration increases. The transition from antiferromagnetic to ferromagnetic 4f spins coincides with the disappearance of 3d spins order, showing strong coupling between Eu2+ ions and conduction electrons.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Multidisciplinary
DianWu Song, LiXuan Zheng, FangHang Yu, Jian Li, LinPeng Nie, Min Shan, Dan Zhao, ShunJiao Li, BaoLei Kang, ZhiMian Wu, YanBing Zhou, KuangLv Sun, Kai Liu, XiGang Luo, ZhenYu Wang, JianJun Ying, XianGang Wan, Tao Wu, XianHui Chen
Summary: This study reveals the nature of density-wave-like transition in vanadium-based kagome superconductors through nuclear magnetic resonance measurements. It confirms the presence of a first-order structural transition and a three-dimensional structural modulation. The study suggests that the orbital order is the primary electronic order induced by the structural transition and provides evidence for possible orbital fluctuations.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Physics, Applied
Abhisek Bag, Saptarshi Mandal
Summary: We study a Cooper pair beam splitter in an iron-pnictide superconductor and calculate the entangled electron-hole current. The interplay of various physical parameters such as doping, nesting, and magnetic ordering affects the resultant current. The non-monotonous and oscillatory nature of the beam splitter current is a manifestation of interference effects. Our findings have potential applications in experimental determination of coexistence phase and in realizing quantum gates or switches.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2023)
Article
Physics, Multidisciplinary
J. Knoerzer, T. Shi, E. Demler, J. Cirac
Summary: By studying trapped-ion quantum systems, we can gain insights into generalized Holstein models and benchmark expensive numerical calculations. Our focus is on simulating many-electron systems and examining the competition between charge-density wave order, fermion pairing, and phase separation.
PHYSICAL REVIEW LETTERS
(2022)
Review
Physics, Multidisciplinary
Rong Yu, Haoyu Hu, Emilian M. Nica, Jian-Xin Zhu, Qimiao Si
Summary: Electron correlations play a central role in iron-based superconductors, especially in the normal state and superconducting state with electron filling n similar to 6. The interplay between orbital-selective correlations and electronic nematicity is a key focus of study.
FRONTIERS IN PHYSICS
(2021)
Article
Physics, Multidisciplinary
Yuan-Fang Yue, Zhong-Bing Huang, Huan Li, Xing Ming, Xiao-Jun Zheng
Summary: In this study, the competition between different magnetic structures in hole-doped Fe-pnicitides was explored using an extended five-orbital Hubbard model with long-range Coulomb interactions. The findings indicate that the stabilized magnetic structure changes with increasing hole doping level. The magnetic competition induced by hole doping may explain the decrease in the Neel temperature TN and the suppressed magnetic moment in hole-doped Fe-pnicitides.
Additionally, the sign reversal of the kinetic energy anisotropy as the magnetic ground state evolves may explain the puzzling sign reversal of the in-plane resistivity anisotropy in hole-doped Fe-pnicitides.
Article
Physics, Multidisciplinary
Ettore Vitali, Peter Rosenberg, Shiwei Zhang
Summary: By leveraging cutting-edge numerical methodologies, this study investigates the ground state and properties of a two-dimensional spin-polarized Fermi gas in an optical lattice. The results provide strong evidence of the stability of the elusive Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluid phase, and show the existence of density order in the system, suggesting the possibility of an intricate coexistence of long-range orders in the ground state. The study also points out significant differences between the ground-state properties and the standard mean-field description, providing a compelling avenue for future theoretical and experimental explorations of spin imbalance, strong interactions, and superfluidity in this exotic phase of matter.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Applied
Yue Zheng, Tao Zhou
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2019)
Article
Physics, Multidisciplinary
Yi Gao, Yuting Wang, Tao Zhou, Huaixiang Huang, Qiang-Hua Wang
PHYSICAL REVIEW LETTERS
(2018)
Article
Physics, Multidisciplinary
Tao Zhou, Yi Gao, ZiDan Wang
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2020)
Article
Physics, Applied
Xia Wu, Tao Zhou
Summary: Theoretical study on vortex states in electron-doped high-Tc superconductors using the mean-field approach and Bogoliubov-de Gennes equations reveals in-gap bound states and their characteristics. The presence of antiferromagnetic order and superconducting order in the underdoped region leads to symmetric in-gap peaks around the Fermi energy, with stronger intensities at negative energy. As doping density increases, the long-range antiferromagnetic order disappears and two in-gap peaks merge into one near the Fermi energy, suggesting that vortex states can be utilized to detect the signature of antiferromagnetic order in electron-doped high-Tc superconductors.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2021)
Article
Physics, Applied
Ziying Ou, Tao Zhou
Summary: In this study, the topological properties of a nodal-line spin gapless semimetal superconductor were examined, revealing the emergence of gapless states at system hinges in the presence of two open boundaries, indicating higher-order topological superconductivity in the system.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2021)
Article
Physics, Applied
Xiaoming Wang, Tao Zhou
Summary: This study reveals that the topologically nontrivial Dirac nodal loop semimetal becomes topologically trivial in the superconducting state with even parity. However, interestingly, the realization of Majorana zero modes is still possible in this topologically trivial state. In the presence of a vortex line, a pair of Majorana zero modes emerge in the vortex core. The occurrence/disappearance of Majorana zero modes can be characterized by the Z(2) topological invariant. Moreover, a vortex phase transition occurs upon changing the chemical potential.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Physics, Multidisciplinary
Xiaoming Wang, Tao Zhou
Summary: The fragile topological superconducting system can be realized in inversion symmetric odd parity superconducting nodal line semimetal materials, generating surface or edge states with zero modes. The results of vortex bound states strongly depend on the specific systems studied.
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Xiaoming Wang, Yu-Xuan Li, Tao Zhou
Summary: We investigate the possibility of introducing a Chern insulator in proximity to a d-wave pseudogap state of the high-Tc superconducting material as a platform for realizing a higher-order topological system. The presence of a proximity-induced d-density-wave (DDW) order leads to fully gapped edge states. In the real space, the DDW order parameter changes sign at the corners, resulting in gapless corner states, suggesting the presence of a higher-order topological state. The higher-order topology in this coupled system is confirmed through calculations of edge polarization and quadrupole moment. In the superconducting state where the superconducting order and DDW order coexist, Majorana corner states emerge.
Article
Materials Science, Multidisciplinary
Wei-Jie Lin, W. LiMing, Tao Zhou
Summary: Recent experimental reports suggest that heavily overdoped monolayer graphene may exhibit superconductivity beyond the Van Hove regime. Theoretical studies have shown that a static spin-density-wave state could be favored in this doping region due to the nested Fermi surface at the Van Hove singularity point. Further research is needed to explore the possibility of spin excitations in the superconducting state.
Article
Materials Science, Multidisciplinary
Yu-Xuan Li, Tao Zhou
Summary: In this study, a microscopic model was used to re-examine the phenomenon of higher-order topological superconductivity in a heterostructure with a two-dimensional topological insulator and a high-temperature superconductor. The symmetries of the quasiparticle energy spectra were found to be significantly different from previous results, with localized edge states appearing at only one boundary in a cylinder geometry. The asymmetrical results were attributed to exploring the pairing order parameter and the anomalous Green's function.
Article
Optics
Gaoyong Sun, Wen-Long You, Tao Zhou
Article
Materials Science, Multidisciplinary
Tao Zhou, Wei Chen, Yi Gao, Z. D. Wang
Article
Materials Science, Multidisciplinary
Tao Zhou, Yi Gao, Z. D. Wang
Article
Materials Science, Multidisciplinary
Tao Zhou, Yi Gao, Z. D. Wang
Article
Materials Science, Multidisciplinary
Yi Gao, Yan Yu, Tao Zhou, Huaixiang Huang, Qiang-Hua Wang
