Article
Physics, Multidisciplinary
Francesco Romeo
Summary: We propose a real-space version of the Bardeen-Cooper-Schrieffer interaction to investigate the interplay between many-body physics and particle confinement on a quantum graph. For the two-body problem, the two-particle wavefunction is found to satisfy an integro-differential Schrodinger equation. The solution reveals the existence of a stable bound state that is enhanced in graphs with specific topology. The enhancement effect is shown to be robust against many-body effects, as demonstrated by the Richardson exact solution. This suggests that effective pairing interaction can be enhanced in quantum graphs with appropriate connectivity. Experimental evidences in Josephson junctions arrays are discussed in connection with the microscopic mechanism described in this work.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Physics, Multidisciplinary
Jiaqi Hu, Zhaorong Wang, Seonghoon Kim, Hui Deng, Sebastian Brodbeck, Christian Schneider, Sven Hofling, Nai H. Kwong, Rolf Binder
Summary: By using a microcavity with strong polarization selectivity, researchers observed a fermionic gain mechanism underlying polariton laser, which is consistent with an open-dissipative-pumped system analog of a polaritonic BCS state.
Article
Physics, Multidisciplinary
P. Solinas, A. Amoretti, F. Giazotto
Summary: Since the 1960s, a deep and surprising connection between the development of superconductivity and quantum field theory has emerged, with examples such as the Anderson-Higgs mechanism and similarities between different equations. This parallelism predicts the superconducting Sauter-Schwinger effect, where electrostatic fields can create coherent excitations from the superconducting ground-state condensate. This phenomenon sheds light on the interaction between superconductors and electric fields and suggests a method for experimental verification.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Je Huan Koo
Summary: The high-transition temperatures of cuprate and pnictide superconductors can be explained by a different distribution of electrons, potentially involving resonance between superconducting electrons and independent charge density waves (CDWs) under the traditional BCS scheme.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Materials Science, Multidisciplinary
Anirban Sharma, Songyang Pu, J. K. Jain
Summary: Research suggests that there is no pairing evidence for filling factor nu = 1/2, but clear evidence for pairing at nu = 5/2. The optimization of parameters leads to the highest overlap between the exact Coulomb ground state at nu = 5/2 and the BCS state, supporting composite-fermion pairing as the mechanism for the 5/2 fractional quantum Hall effect.
Article
Physics, Multidisciplinary
Robert J. Lewis-Swan, Diego Barberena, Julia R. K. Cline, Dylan J. Young, James K. Thompson, Ana Maria Rey
Summary: The proposal suggests simulating dynamical phases of a BCS superconductor using cold atoms trapped in an optical cavity, with effective Cooper pairs encoded via internal states of the atoms and attractive interactions realized through the exchange of virtual photons. By controlling the interaction strength and dispersion relation of the effective Cooper pairs, exploration of the full dynamical phase diagram of the BCS model is enabled. This proposal opens the door for studying the nonequilibrium features of quantum magnetism and superconductivity through atom-light interactions in cold atomic gases.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Fedor Simkovic, Youjin Deng, Evgeny Kozik
Summary: This study investigates the superfluid instability in the 2D Hubbard model using a nonperturbative approach and maps out the superfluid ground-state phase diagram under various parameter ranges. The phase diagram undergoes dramatic transformations in different regions, showing rich physical phenomena under different parameter conditions.
Article
Physics, Multidisciplinary
H. P. Ojeda Collado, Gonzalo Usaj, C. A. Balserio, Damian H. Zanette, Jose Lorenzana
Summary: We present a systematic study of the dynamical phase diagram of a periodically driven BCS system. Three different driving mechanisms are considered and compared. We identify the locus in parameter space of parametric resonances and four dynamical phases. By mapping the BCS problem to a collection of nonlinear and interacting classical oscillators, we shed light on the origin of time-crystal phases and parametric resonances.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Yuta Mizukami, Masahiro Haze, Ohei Tanaka, Kohei Matsuura, Daiki Sano, Jakob Boeker, Ilya Eremin, Shigeru Kasahara, Yuji Matsuda, Takasada Shibauchi
Summary: The authors use FeSe1-xSx to investigate the evolution of the superconducting state in the BCS-BEC crossover regime and observe the multiband nature of the crossover, as well as a suppression of the nematic order upon S-substitution. Recent experiments suggest that investigations into the BCS-BEC crossover may be possible using strongly correlated systems, in addition to ultracold atomic systems.
COMMUNICATIONS PHYSICS
(2023)
Article
Multidisciplinary Sciences
Daniel K. Hoffmann, Vijay Pal Singh, Thomas Paintner, Manuel Jaeger, Wolfgang Limmer, Ludwig Mathey, Johannes Hecker Denschlag
Summary: Researchers demonstrate the variation of second sound wave in the crossover from Bose-Einstein condensate to Bardeen-Cooper-Schrieffer superfluid using ultracold fermionic Li-6 atoms with tunable interactions. The speed of second sound varies only slightly in this crossover regime, providing deeper insight into the propagation of sound waves. The measurement results are compared with classical-field simulations to aid in the interpretation of experiments.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Arne Schobert, Jan Berges, Tim Wehling, Erik van Loon
Summary: Charge-density waves cause symmetry-breaking displacements of atoms and changes in electronic structure. Linear response theories offer a way to study these effects based on a single ab initio calculation. Downfolding approaches reduce the electronic system to a smaller number of bands, incorporating additional correlation and environmental effects, but the limitations of this approach are not always clear.
Article
Physics, Multidisciplinary
H. P. Ojeda Collado, Gonzalo Usaj, C. A. Balseiro, Damian H. Zanette, Jose Lorenzana
Summary: We studied the out-of-equilibrium dynamics of a BCS condensate under periodic drive and discovered emerging parametric resonances. Arnold tongues appear when the driving frequency matches a specific value, leading to a commensurate time-crystal condensate. Outside these tongues, the synchronized collective Higgs mode is stabilized without strong perturbation.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Multidisciplinary Sciences
Israel Chavez, Marcela Grether, Manuel de Llano
Summary: The superfluid density of a superconductor is calculated using the generalized Bose-Einstein condensation theory, considering two special cases. The results show a linear relationship between temperature and superfluid density in the strong-coupling regime, while in the weak-coupling regime, the results agree with experimental data.
SN APPLIED SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
D. A. Mayoh, A. D. Hillier, G. Balakrishnan, M. R. Lees
Summary: The study presents evidence of time-reversal symmetry breaking (TRSB) and Bardeen-Cooper-Schrieffer (BCS)-like superconductivity in noncentrosymmetric La7Pd3, suggesting implications for other CS and NCS superconductors where TRSB has been observed.
Article
Chemistry, Multidisciplinary
Michael E. Berkowitz, Brian S. Y. Kim, Guangxin Ni, Alexander S. McLeod, Chiu Fan Bowen Lo, Zhiyuan Sun, Genda Gu, Kenji Watanabe, Takashi Taniguchi, Andrew J. Millis, James C. Hone, Michael M. Fogler, Richard D. Averitt, D. N. Basov
Summary: The study reveals that weak HCP features in the near-field can be significantly enhanced by coupling graphene SPP and HCP in layered graphene/hBN/Bi-2212 heterostructures. This enhancement arises from the multilayered structures acting as plasmonic cavities, altering collective modes of the layered superconductor.
Article
Physics, Applied
Ji Jiang, M. V. Milosevic, Yong-Lei Wang, Zhi-Li Xiao, F. M. Peeters, Qing-Hu Chen
Summary: A strong superconducting diode effect is observed in a thin superconducting film with periodic nanostructures of magnetic dots. The effect is caused by dissipation, activated by the current, being mitigated by vortex-antivortex pairs that periodically nucleate under the dots. By reversing the polarity of the applied current, the nucleation of vortex-antivortex pairs is suppressed, allowing the system to remain in a superconducting state even at higher currents, resulting in a pronounced diodic response. Dissipative Ginzburg-Landau simulations provide detailed information on the involved processes and reliable ranges for experimental realization of this nonvolatile superconducting diode, which functions without an applied magnetic field and is designed to exhibit fluxonics.
PHYSICAL REVIEW APPLIED
(2022)
Article
Multidisciplinary Sciences
Z. Guguchia, C. Mielke, D. Das, R. Gupta, J. -X. Yin, H. Liu, Q. Yin, M. H. Christensen, Z. Tu, C. Gong, N. Shumiya, Md Shafayat Hossain, Ts Gamsakhurdashvili, M. Elender, Pengcheng Dai, A. Amato, Y. Shi, H. C. Lei, R. M. Fernandes, M. Z. Hasan, H. Luetkens, R. Khasanov
Summary: In this study, pressure-tuned and ultra-low temperature muon spin spectroscopy was used to uncover the unconventional nature of superconductivity in RbV3Sb5 and KV3Sb5. It was found that at ambient pressure, time-reversal symmetry breaking charge order was observed in RbV3Sb5, and the superconducting state displayed a nodal energy gap and reduced superfluid density. Applying pressure suppressed the charge-order transitions, increased the superfluid density, and progressively evolved the superconducting state from nodal to nodeless. The optimal superconductivity state was found to break time-reversal symmetry. These results offer unique insights into the nature of the pairing state and highlight the tunable nodal kagome superconductivity competing with time-reversal symmetry-breaking charge order.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
Zihan Wei, Hongmei Du, Dingding Li, Mei Ping Jiang, Ping Zhang, Shixian Chen, Yang-Yang Lyu, Hancong Sun, Yong-Lei Wang, Dieter Koelle, Reinhold Kleiner, Huabing Wang, Peiheng Wu
Summary: In this study, we focus on controlling the superconductivity of the uppermost CuO2 double layer of BSCCO crystal. Gold electrodes are deposited onto the BSCCO surface by a high-vacuum evaporation technique, and surface Josephson junctions (SJJs) are fabricated as a probe to evaluate the superconductivity of the uppermost layer. The properties of the SJJs systematically reveal the evolutionary process of superconductivity, extending the range for practical applications.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Feng Li, Wei Liu, Jianxing Ma, Mingsheng Long, Xiaojie Lou, Kai Li, Chunchang Wang, Lei Shan
Summary: By introducing Bi0.5Li0.5TiO3 dopant, the electrocaloric effect (ECE) performance of NaNbO3-xBi(0.5)Li(0.5)TiO(3) (x = 0.08, 0.10, and 0.12) system in different phases (P, Q, and R) was studied. It was found that the addition of dopant changed the phase structure of the material and improved its ECE performance, especially in x = 0.10 where a dual peak ECE phenomenon occurred.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Changti Pan, Jiahui Zhao, Baojie Zhang, Jie Wang, Xiaokun Huo, Li Yang, Kun Xu, Yu Zhou, Lei Shan, Yunxiang Lin
Summary: The lattice Se atom-modified CoOOH electrocatalyst with a lower energy barrier was obtained through the electrochemical reconstruction of the Co0.85Se precatalyst, and it exhibited superior oxygen evolution reaction (OER) activity, which was consistent with theoretical predictions. Designing and fabricating electrocatalysts with ingenious lattice modifications are crucial for achieving a highly efficient OER process.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Jiaming Luo, Shuyi Li, Zhipeng Ye, Rui Xu, Han Yan, Junjie Zhang, Gaihua Ye, Lebing Chen, Ding Hu, Xiaokun Teng, William A. . Smith, Boris I. Yakobson, Pengcheng Dai, Andriy H. Nevidomskyy, Rui He, Hanyu Zhu
Summary: This study reports the first observation of coherent hybridization of magnons and phonons in monolayer antiferromagnet FePSe3, which exhibits nontrivial band inversion between longitudinal and transverse optical phonons in zero magnetic field. The presence of magnetic-field-controlled topological phase transition is theoretically guaranteed by the spin and lattice symmetry, as confirmed by nonzero Chern numbers calculated from the coupled spin-lattice model. The 2D topological magnon-phonon hybridization potentially paves the way for quantum phononics and magnonics with an ultrasmall footprint.
Article
Physics, Multidisciplinary
Xiaokun Teng, Ji Seop Oh, Hengxin Tan, Lebing Chen, Jianwei Huang, Bin Gao, Jia-Xin Yin, Jiun-Haw Chu, Makoto Hashimoto, Donghui Lu, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Garrett E. Granroth, Binghai Yan, Robert J. Birgeneau, Pengcheng Dai, Ming Yi
Summary: Electron correlations in quantum materials can lead to emergent orders, such as the topological states found in kagome lattice materials. These emergent orders are a result of the specific electronic band structure associated with the kagome lattice geometry. Various correlated electronic phases, including magnetism and superconductivity, have been discovered in kagome lattice materials. In this study, the authors observe all three electronic signatures of the kagome lattice in FeGe using angle-resolved photoemission spectroscopy and provide evidence for the interplay between magnetism and charge order in this material.
Article
Multidisciplinary Sciences
Yi Cui, Lu Liu, Huihang Lin, Kai-Hsin Wu, Wenshan Hong, Xuefei Liu, Cong Li, Ze Hu, Ning Xi, Shiliang Li, Rong Yu, Anders W. Sandvik, Weiqiang Yu
Summary: By using high-pressure 11B nuclear magnetic resonance measurements, we have observed a magnetic field-induced plaquette singlet to antiferromagnetic transition in the quantum magnet SrCu2(BO3)2. The first-order signatures of the transition weaken with increasing pressure, and quantum critical scaling is observed at the highest pressure. These findings provide an experimental platform for investigating the deconfined quantum critical point.
Article
Multidisciplinary Sciences
Bin Gao, Tong Chen, Xiao-Chuan Wu, Michael Flynn, Chunruo Duan, Lebing Chen, Chien-Lung Huang, Jesse Liebman, Shuyi Li, Feng Ye, Matthew B. Stone, Andrey Podlesnyak, Douglas L. Abernathy, Devashibhai T. Adroja, Manh Duc Le, Qingzhen Huang, Andriy H. Nevidomskyy, Emilia Morosan, Leon Balents, Pengcheng Dai
Summary: Magnetic order can still occur in materials with spin-singlet ground state due to exchange interactions mixing excited crystal electric field states. The study investigates Ni2Mo3O8 and finds that crystal electric field states in both the paramagnetic and antiferromagnetic states exhibit dispersive excitations.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Hongwei Shi, Kai Li, Feng Li, Jianxing Ma, Yubing Tu, Mingsheng Long, Yilin Lu, Weiping Gong, Chunchang Wang, Lei Shan
Summary: This study designs the (1 - x) (0.65BiFeO(3)-0.35BaTiO(3))-xLa(0.5)Na(0.5)TiO(3) (BF-BT-xLNT) system, and significantly improves the piezoelectric properties, relaxor property, and resistivity of the material by adding La(0.5)Na(0.5)TiO(3). The thermal stability of electrostrain is achieved at the x = 0.04 composition, making this material suitable for high-temperature piezoelectric and stable electrostrain applications.
Article
Physics, Multidisciplinary
Hualei Sun, Liang Qiu, Yifeng Han, Yunwei Zhang, Weiliang Wang, Chaoxin Huang, Naitian Liu, Mengwu Huo, Lisi Li, Hui Liu, Zengjia Liu, Peng Cheng, Hongxia Zhang, Hongliang Wang, Lijie Hao, Man-Rong Li, Dao-Xin Yao, Yusheng Hou, Pengcheng Dai, Meng Wang
Summary: Understanding the interplay between superconductivity and magnetism in EuTe2 is achieved through high pressure studies. A structural transition and superconductivity are observed at different pressures. Strong couplings between local moments and conduction electrons are observed in the low-pressure phase, while the high-pressure phase loses magnetism and has a lower upper critical field.
COMMUNICATIONS PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Daniel Multer, Jia-Xin Yin, Md. Shafayat Hossain, Xian Yang, Brian C. Sales, Hu Miao, William R. Meier, Yu-Xiao Jiang, Yaofeng Xie, Pengcheng Dai, Jianpeng Liu, Hanbin Deng, Hechang Lei, Biao Lian, M. Zahid Hasan
Summary: Direct imaging and magnetic tuning of flat band localization in kagome materials is achieved through scanning tunneling microscopy and photoemission spectroscopy. This study provides crucial insights into the localization of flat band states.
COMMUNICATIONS MATERIALS
(2023)
Correction
Chemistry, Inorganic & Nuclear
Changti Pan, Jiahui Zhao, Baojie Zhang, Jie Wang, Xiaokun Huo, Li Yang, Kun Xu, Yu Zhou, Lei Shan, Yunxiang Lin
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Abhijit Biswas, Rui Xu, Joyce Christiansen-Salameh, Eugene Jeong, Gustavo A. Alvarez, Chenxi Li, Anand B. Puthirath, Bin Gao, Arushi Garg, Tia Gray, Harikishan Kannan, Xiang Zhang, Jacob Elkins, Tymofii S. Pieshkov, Robert Vajtai, A. Glen Birdwell, Mahesh R. Neupane, Bradford B. Pate, Tony Ivanov, Elias J. Garratt, Pengcheng Dai, Hanyu Zhu, Zhiting Tian, Pulickel M. Ajayan
Summary: In this research, the phase stability of 2D/3D h-BN/c-BN nanocomposites is investigated, showing that the coexistence of the two phases can result in strong nonlinear optical properties and low thermal conductivity at room temperature. Spark-plasma sintering of the nanocomposites demonstrates complete phase transformation to 2D h-BN with improved crystalline quality, where the nucleation and growth kinetics are possibly governed by 3D c-BN. These findings provide insights into phase engineering of BN polymorph-based nanocomposites with desirable properties for optoelectronics and thermal energy management applications.
Article
Materials Science, Multidisciplinary
Bin Gao, Tong Chen, Chien-Lung Huang, Yiming Qiu, Guangyong Xu, Jesse Liebman, Lebing Chen, Matthew B. Stone, Erxi Feng, Huibo Cao, Xiaoping Wang, Xianghan Xu, Sang-Wook Cheong, Stephen M. Winter, Pengcheng Dai
Summary: In this study, neutron scattering was used to investigate CoZnMo3O8 and found a wave-vector-dependent excitation continuum at low energy that disappears with increasing temperature. Although these excitations resemble a spin excitation continuum in a quantum spin liquid state, their presence in CoZnMo3O8 is due to magnetic intersite disorder-induced dynamic spin states with peculiar excitations. Therefore, this study provides direct experimental evidence for the presence of a disorder-induced spin excitation continuum.
