Article
Multidisciplinary Sciences
Tian Shang, Jianzhou Zhao, Lun-Hui Hu, Junzhang Ma, Dariusz Jakub Gawryluk, Xiaoyan Zhu, Hui Zhang, Zhixuan Zhen, Bocheng Yu, Yang Xu, Qingfan Zhan, Ekaterina Pomjakushina, Ming Shi, Toni Shiroka
Summary: TRuSi materials exhibit unconventional superconductivity and behave as three-dimensional Kramers nodal-line semimetals in their normal states. These materials spontaneously break time-reversal symmetry at the superconducting transition, while possessing fully gapped superconductivity. Their unconventional behavior is consistent with unitary (s + ip) pairing, indicating a mixture of spin singlets and spin triplets.
Article
Materials Science, Multidisciplinary
Arnob Kumar Ghosh, Tanay Nag, Arijit Saha
Summary: We theoretically investigate the Floquet generation of second-order topological superconducting phase in both 2D and 3D high-temperature platforms, revealing a transition between weak and strong SOTSC phases. Numerical and analytical validation confirms the existence of these phases and demonstrates the robustness of corner modes against moderate disorder.
Article
Materials Science, Multidisciplinary
Chang Xu, Ka Ho Wong, Eric Mascot, Dirk K. Morr
Summary: Recent experiments demonstrate the existence of two competing topological superconducting phases in FeSe0.45Te0.55, and the topological origin of these regions is identified by studying the form of Majorana edge modes.
Article
Physics, Multidisciplinary
Chang -woo Cho, Jian Lyu, Liheng An, Tianyi Han, Kwan To Lo, Cheuk Yin Ng, Jiaqi Hu, Yuxiang Gao, Gaomin Li, Mingyuan Huang, Ning Wang, Jorg Schmalian, Rolf Lortz
Summary: This study investigates the unconventional superconducting states of 2H-NbSe2 in its two-dimensional form through magnetoresistance experiments. The results show that it can exhibit nontrivial superconductivity under high magnetic fields, which may be attributed to the presence of multiple competing superconducting channels.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
A. Singh, H. Y. Huang, J. D. Xie, J. Okamoto, C. T. Chen, T. Watanabe, A. Fujimori, M. Imada, D. J. Huang
Summary: Electron quasiparticles play an important role in solid-state physics, but there has been skepticism towards conventional theories for high-temperature superconducting cuprates. This study discovers an unusually enhanced excitonic excitation in a superconducting material, proving the involvement of high-energy excitons in superconductivity. These findings provide important constraints for theories on pseudogap and superconducting mechanisms, and offer a novel approach to understanding the electronic structure of superconducting cuprates.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Mukhtar L. Adam, Zhanfeng Liu, Oyawale A. Moses, Xiaojun Wu, Li Song
Summary: Controlled doping and intercalation of donor atoms can enhance the superconducting behavior of materials, as demonstrated by the 20-fold increase in superconducting temperature of TaSe2 through Sn atoms intercalation. The existence of nontrivial topological features, such as nodal lines and drumhead-like surface states with inversion symmetry, in Sn0.5TaSe2 make it a potential candidate for topological superconductivity.
Article
Physics, Condensed Matter
A. G. Groshev, A. K. Arzhnikov
Summary: This study investigates thermal fluctuations of a superconducting order parameter with extended s and chiral d + id symmetry on a triangular lattice, based on a quasi-two-dimensional single-band model with attraction between electrons. The distribution functions of phase fluctuation probabilities dependent on temperature and charge carrier concentration are obtained, as well as the temperature dependences of the amplitudes of the averaged superconducting order parameter. Additionally, a phase diagram of superconducting states is constructed for the entire range of variation in charge carrier concentration, with comparisons to experimental data obtained using machine learning techniques.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Physics, Condensed Matter
Jiapei Zhuang, Ching-Yu Huang, Po-Yao Chang, Daw-Wei Wang
Summary: We systematically investigate the ground state phase diagram and finite temperature phase transitions for a Rydberg-dressed Fermi gas in a bilayer optical lattice. Our self-consistent mean-field calculation reveals that the gapped topological superfluids in each layer are coupled together by s-wave pairing in an intermediate inter-layer distance, resulting in spontaneously modulated phases between the two order parameters. The obtained ground state is a gapless topological superfluid with quantized topological charges at the gapless points, leading to a zero energy flat band at the edges. Finally, we observe two distinct critical temperatures in the finite temperature phase diagrams of this two-dimensional gapless superfluid, demonstrating the significant many-body effects on paired topological superfluids.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Optics
Chaohua Wu, Xin Guan, Jingtao Fan, Gang Chen, Suotang Jia
Summary: The study presents an experimentally feasible method to achieve a two-dimensional superconducting qubit lattice with tunable coupling strengths and configures a higher-order topological phase. By analyzing the dynamics of single-excitation quantum states, the quadrupole topological phases are effectively characterized. Additionally, an effective scheme for quantum information transfer via corner states is proposed in the qubit lattice system.
Article
Quantum Science & Technology
Long Zhang, Xiong-Jun Liu
Summary: This research proposes a scheme to realize unconventional Floquet topological phases by engineering local band structures in particular momentum subspaces called bandinversion surfaces (BISs). By manipulating the BIS configuration, novel Floquet topological phases can be efficiently realized, manipulated, and detected.
Article
Materials Science, Multidisciplinary
Ryoi Ohashi, Shingo Kobayashi, Yukio Tanaka
Summary: In this study, the authors numerically calculated the topological phases of QAH/unconventional SC hybrid systems, revealing a variety of phases such as crystalline symmetry-protected edge modes, line node phase, and multiple chiral Majorana edge modes. These phenomena arise from the nontrivial topological interplay between the QAH and unconventional SCs. Additionally, they discuss tunnel conductance in junctions between normal metals and hybrid systems, showing distinguishability between chiral and helical Majorana edge modes based on the presence or absence of a zero-bias conductance peak.
Article
Materials Science, Multidisciplinary
W. Zhou, B. Li, Y. Shen, J. J. Feng, C. Q. Xu, H. T. Guo, Z. He, B. Qian, Ziming Zhu, Xiaofeng Xu
Summary: By applying pressure, three distinct superconducting phases with corresponding structural transitions can be induced in GeSb4Te7 material, and the results from first-principles calculations are consistent with experimental observations.
Article
Multidisciplinary Sciences
Jingjing Niu, Tongxing Yan, Yuxuan Zhou, Ziyu Tao, Xiaole Li, Weiyang Liu, Libo Zhang, Hao Jia, Song Liu, Zhongbo Yan, Yuanzhen Chen, Dapeng Yu
Summary: This study simulates a second-order topological phase in a two-dimensional space using superconducting qubits, observing the realization of higher-order topology directly through the measurement of pseudo-spin texture in momentum space of the bulk for the first time. Novel topological phase transitions were further observed from the second-order topological phase to the trivial phase and to the first-order topological phase with nonzero Chern number.
Article
Materials Science, Multidisciplinary
L. X. Xu, Y. Y. Y. Xia, S. Liu, Y. W. Li, L. Y. Wei, H. Y. Wang, C. W. Wang, H. F. Yang, A. J. Liang, K. Huang, T. Deng, W. Xia, X. Zhang, H. J. Zheng, Y. J. Chen, L. X. Yang, M. X. Wang, Y. F. Guo, G. Li, Z. K. Liu, Y. L. Chen
Summary: In this study, we propose the layered superconducting material CaSn as a WTI with nontrivial Z(2) and protected nodal-line semimetal by crystalline nonsymmorphic symmetry. Our ARPES investigation on the electronic structure agrees well with the calculation, and STM/STS observation at the surface step edge shows signatures of the expected TES. These integrated evidences strongly support the existence of TES in the nonsymmorphic nodal-line semimetal CaSn, making it a versatile material platform for multiple exotic electronic states and topological superconductivity.
Article
Physics, Multidisciplinary
Mei-Ling Lu, Yao Wang, He-Zhi Zhang, Hao-Lin Chen, Tian-Yuan Cui, Xi Luo
Summary: By applying an external in-plane magnetic field, we observe the appearance of a topological nodal superconducting phase in the two-dimensional topological surface states. This phase is protected by chiral symmetry in the presence of a non-zero magnetic field, and exhibits Majorana Fermi arcs connecting the Majorana nodes along the edges, similar to Weyl semimetals. The topological nodal superconductor is an intermediate phase between two different chiral superconductors and remains stable against substrate effects. The two-dimensional effective theory of this phase also describes the low energy behavior of a three-dimensional lattice model of an iron-based superconductor with a thin film geometry. Manipulating the localization of Majorana nodes through external in-plane magnetic fields may introduce a non-trivial topological Berry phase between them.
Article
Physics, Condensed Matter
Z. H. Liu, Y. G. Zhao, Y. Li, L. L. Jia, Y. P. Cai, S. Zhou, T. L. Xia, B. Buechner, S. V. Borisenko, S. C. Wang
JOURNAL OF PHYSICS-CONDENSED MATTER
(2015)
Article
Physics, Multidisciplinary
Kun Jiang, Yi Zhang, Sen Zhou, Ziqiang Wang
PHYSICAL REVIEW LETTERS
(2015)
Article
Physics, Multidisciplinary
Sen Zhou, Kun Jiang, Hua Chen, Ziqiang Wang
Article
Physics, Multidisciplinary
Hao Zhou, Yuan-Yuan Xu, Sen Zhou
COMMUNICATIONS IN THEORETICAL PHYSICS
(2018)
Article
Physics, Multidisciplinary
Kun Jiang, Sen Zhou, Xi Dai, Ziqiang Wang
PHYSICAL REVIEW LETTERS
(2018)
Article
Materials Science, Multidisciplinary
S. Yu, X. D. Li, S. Q. Wu, Y. H. Wen, S. Zhou, Z. Z. Zhu
MATERIALS RESEARCH BULLETIN
(2014)
Article
Materials Science, Multidisciplinary
Sen Zhou, Yupeng Wang, Ziqiang Wang
Article
Multidisciplinary Sciences
Hui Chen, Haitao Yang, Bin Hu, Zhen Zhao, Jie Yuan, Yuqing Xing, Guojian Qian, Zihao Huang, Geng Li, Yuhan Ye, Sheng Ma, Shunli Ni, Hua Zhang, Qiangwei Yin, Chunsheng Gong, Zhijun Tu, Hechang Lei, Hengxin Tan, Sen Zhou, Chengmin Shen, Xiaoli Dong, Binghai Yan, Ziqiang Wang, Hong-Jun Gao
Summary: In this study, unconventional superconductivity and a pair density wave (PDW) were observed in CsV3Sb5, a vanadium-based kagome metal. The material exhibits a V-shaped pairing gap and a 3Q PDW, along with other unique characteristics such as strong-coupling superconductivity and charge order. These findings provide insights into the correlated electronic states and superconductivity in vanadium-based kagome metals.
Article
Multidisciplinary Sciences
Sen Zhou, Ziqiang Wang
Summary: The recent discovery of novel charge density wave (CDW) and pair density wave (PDW) in kagome lattice superconductors AV(3)Sb(5) suggests the presence of unexpected time-reversal symmetry breaking correlated and topological states. The authors propose that the metallic CDW state with circulating loop currents is a doped orbital Chern insulator near van Hove filling, leading to the emergence of various correlated and topological states.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Jin-Wei Dong, Ziqiang Wang, Sen Zhou
Summary: Recent experiments have found evidence for possible spontaneous time-reversal symmetry (TRS) breaking in the charge density wave (CDW) ordered state of vanadium-based nonmagnetic kagome metals AV3Sb5 (A = K, Rb, Cs). The emergence of loop currents has been suggested as a candidate for the TRS breaking state, but a microscopic model for this phenomenon is still lacking. In this study, the susceptibility of real and imaginary bond orders on the kagome lattice is calculated, and the importance of next-nearest-neighbor Coulomb repulsion V2 in triggering the instability toward imaginary bond ordered CDW is revealed. Furthermore, a concrete effective model on the kagome lattice is studied, providing insights into the ground states, properties, and phase diagram in relation to the values of V1 and V2 at van Hove filling. The research also extends these results to include electron doping, showcasing the stabilization of loop currents and the emergence of doped orbital Chern insulators with significant Berry curvature and orbital magnetic moment.
Article
Materials Science, Multidisciplinary
Jun-Ang Wang, Sen Zhou, Panagiotis Kotetes
Summary: Recent experiments have found evidence for chiral charge order in kagome superconductors. Researchers have discovered that a pyramidal heterostructure of superconductor/charge Chern insulator/superconductor can induce a one-dimensional spinless p-wave superconductor, allowing the pinning of Majorana zero modes (MZMs) at termination edges and domain walls. They have also shown that a double pyramidal hybrid can define a double MZM track, where braiding can occur by varying the superconducting phase differences in space and time.
Article
Materials Science, Multidisciplinary
Yun-Peng Huang, Jin-Wei Dong, Ziqiang Wang, Sen Zhou
Summary: Recent optical second-harmonic generation experiments in undoped spin-orbit Mott insulator Sr2IrO4 revealed broken spatial symmetries, leading to debates on its ground state nature. The proposed canted antiferromagnetism with circulating staggered pseudospin current breaks symmetries and shows magnetoelectric coexistence. A three-dimensional Hubbard model with spin-orbit coupling and structural distortion is used to demonstrate the microscopic realization of the coexistence state.
Article
Materials Science, Multidisciplinary
Yun-Peng Huang, Jin-Wei Dong, Panagiotis Kotetes, Sen Zhou
Article
Materials Science, Multidisciplinary
Zhan Wang, Sen Zhou, Weiqiang Chen, Fu-Chun Zhang
Article
Materials Science, Multidisciplinary
Sen Zhou, Long Liang, Ziqiang Wang
