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
Physics, Multidisciplinary
Lorenzo Dominici, Amir Rahmani, David Colas, Dario Ballarini, Milena De Giorgi, Giuseppe Gigli, Daniele Sanvitto, Fabrice P. Laussy, Nina Voronova
Summary: The authors study the rotational entities of phase vortices and skyrmions in condensates, superfluids, and optics, using two-component microcavity polaritons. They reveal the dynamics of these entities and their connection to the Berry curvature, which unifies different quantum spaces. The Berry curvature also explains the ultrafast spiraling motion of singular vortex cores and provides a simple expression for their velocity.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Multidisciplinary
Shin-ichi Uchida
Summary: Recent research has successfully revealed universal aspects of charge order and its fluctuations in high-Tc cuprates. It has been found that charge order is compatible with superconductivity, with fluctuations having high onset temperatures and energy scales comparable to those of the pseudogap. The correlations of charge order may be essential for creating the pseudogap and potentially generating high-Tc superconductivity by collaborating with spin and pairing correlations.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2021)
Article
Optics
S. S. Seidov, M. Fistul
Summary: This theoretical study examines the coherent quantum dynamics of a single magnetic fluxon trapped in Josephson-junction parallel arrays with large kinetic inductances. The dynamics of the magnetic fluxon are analyzed in detail, including energy bands, quantum tunneling, and oscillations controlled by external factors like voltage and bias current. The study shows how these quantum effects manifest in the current-voltage characteristics of the arrays.
Article
Multidisciplinary Sciences
Riccardo Arpaia, Leonardo Martinelli, Marco Moretti Sala, Sergio Caprara, Abhishek Nag, Nicholas B. Brookes, Pietro Camisa, Qizhi Li, Qiang Gao, Xingjiang Zhou, Mirian Garcia-Fernandez, Ke-Jin Zhou, Enrico Schierle, Thilo Bauch, Ying Ying Peng, Carlo Di Castro, Marco Grilli, Floriana Lombardi, Lucio Braicovich, Giacomo Ghiringhelli
Summary: Charge density fluctuations are found to be associated with the quantum critical point of the strange metal phase, strengthening the role of charge order and providing insights into high-temperature superconductivity.
NATURE COMMUNICATIONS
(2023)
Article
Astronomy & Astrophysics
Patrick Copinger, Pablo Morales
Summary: Motivated by the fermionic Berry's phase in momentum space, this study focuses on a local Abelian phase in momentum space coupled to electromagnetism for complex scalars. The interaction of both Abelian fields leads to a momentum gauge dependent emergent spacetime. A concrete example is provided, where classical solutions of the Berry-inspired gauge field result in an emergent Newtonian gravity with gravitational potential predicted by coupled Coulomb fields in both configuration and momentum spaces. The noncommutative aspects of the theory are also explored.
Article
Physics, Multidisciplinary
Konstantin Yu. Arutyunov, Janne S. Lehtinen, Alexey Radkevich, Andrew G. Semenov, Andrei D. Zaikin
Summary: The study investigates quantum phase slips in nano-scale superconducting devices, revealing their impact on transport properties at low temperatures, exhibiting non-trivial superconducting and weak Coulomb blockade characteristics caused by the quantum tunneling of magnetic fluxons in the nanowire.
COMMUNICATIONS PHYSICS
(2021)
Article
Physics, Multidisciplinary
H. Y. Huang, A. Singh, C. Y. Mou, S. Johnston, A. F. Kemper, J. van den Brink, P. J. Chen, T. K. Lee, J. Okamoto, Y. Y. Chu, J. H. Li, S. Komiya, A. C. Komarek, A. Fujimori, C. T. Chen, D. J. Huang
Summary: Quantum phase transitions are crucial in shaping the phase diagram of high-temperature cuprate superconductors, with evidence found for the role of charge order in the compound La2-xSrxCuO4 (LSCO) impacting phonon softening. These results provide insight into the quantum critical scaling and discommensurations associated with charge order in LSCO.
Article
Physics, Multidisciplinary
Jaime Merino, Arnaud Ralko
Summary: The large thermal Hall conductivity recently observed in Mott insulating cuprates has been attributed to chiral neutral spin excitations. A quantum spin liquid with Majorana excitations, Chern number +/- 4, and large thermal Hall conductivity has been found as an excited state of a frustrated Heisenberg model on the square lattice.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Yingying Peng, Leonardo Martinelli, Qizhi Li, Matteo Rossi, Matteo Mitrano, Riccardo Arpaia, Marco Moretti Sala, Qiang Gao, Xuefei Guo, Gabriella Maria De Luca, Andrew Walters, Abhishek Nag, Andi Barbour, Genda Gu, Jonathan Pelliciari, Nicholas B. Brookes, Peter Abbamonte, Marco Salluzzo, Xingjiang Zhou, Ke-Jin Zhou, Valentina Bisogni, Lucio Braicovich, Steven Johnston, Giacomo Ghiringhelli
Summary: This study investigates the electron-phonon coupling in high-Tc superconducting cuprates using resonant inelastic x-ray scattering. By comparing the results from two cuprate families at different doping levels, it is found that the EPC strength decreases with doping and shows a nonmonotonic trend at smaller momenta, which is attributed to the screening effect of charge carriers.
Article
Physics, Multidisciplinary
A. von Hoegen, M. Fechner, M. Foerst, N. Taherian, E. Rowe, A. Ribak, J. Porras, B. Keimer, M. Michael, E. Demler, A. Cavalleri
Summary: In this study, it is shown that certain lattice vibrations in cuprate high-T-c superconductors can induce transient terahertz reflectivity features suggestive of nonequilibrium superconductivity above the critical temperature. Time-resolved measurements reveal a three-order-of-magnitude amplification of a 2.5-THz electronic mode in driven YBa2Cu3O6+x. Theoretical analysis explains these observations by proposing an amplification mechanism for finite-momentum Josephson plasma polaritons. The study also emphasizes the significance of nonlinear mode mixing in amplifying fluctuating modes above the transition temperature in a wide range of materials.
Article
Physics, Multidisciplinary
Han Jin-Ge, Ouyang Peng-Hui, Li En-Ping, Wang Yi-Wen, Wei Lian-Fu
Summary: This paper presents a method for calibrating the parameters of Josephson junctions using low frequency current biases. The typical parameters of the junction, such as junction capacitance, critical current, and damping coefficient, are estimated by measuring I-V curves and statistical distributions of jump currents. The method provides a relatively noise-insensitive and microwave driving-free approach for estimating the damping coefficient of the junction.
ACTA PHYSICA SINICA
(2021)
Article
Materials Science, Multidisciplinary
Haiyu Lu, Makoto Hashimoto, Su-Di Chen, Shigeyuki Ishida, Dongjoon Song, Hiroshi Eisaki, Abhishek Nag, Mirian Garcia-Fernandez, Riccardo Arpaia, Giacomo Ghiringhelli, Lucio Braicovich, Jan Zaanen, Brian Moritz, Kurt Kummer, Nicholas B. Brookes, Ke-Jin Zhou, Zhi-Xun Shen, Thomas P. Devereaux, Wei-Sheng Lee
Summary: This study investigates the interplay between charge order (CO) and superconductivity using resonant inelastic x-ray scattering (RIXS) in the Bi-2212 cuprate phase diagram. The results show that as doping increases, the CO wave vector decreases, and the correlation length becomes shorter. CO excitations in the superconducting state are strongest at the critical doping p(c), consistent with behavior at a charge order quantum critical point. Interestingly, p(c) appears to be near optimal doping, where the superconducting transition temperature is maximal.
Article
Materials Science, Multidisciplinary
Wenshan Hong, Honglin Zhou, Zezhong Li, Yang Li, Uwe Stuhr, Amit Pokhriyal, Haranath Ghosh, Zhen Tao, Xingye Lu, Jiangping Hu, Shiliang Li, Huiqian Luo
Summary: Based on inelastic neutron scattering measurements on a superconducting iron pnictide, a highly three-dimensional spin resonance mode with upward V-shape dispersion has been discovered, both in the ab plane and along the c axis. The c-axis dependence of both the resonance energy and its intensity in iron pnictides can be universally scaled with the distance between two adjacent Fe-As layers, suggesting the role of interlayer coupling in iron-based superconductivity. These results highlight the possibility of interlayer pairing driven by magnetic fluctuations under certain spin-orbit couplings.
Article
Materials Science, Multidisciplinary
E. J. Koenig, I. Protopopov, A. Levchenko, I. Gornyi, A. D. Mirlin
Summary: This study investigates the problem of finite resistance R in superconducting films near zero temperature, with resistance generated by vortex configurations of the phase field. Different processes lead to different resistance mechanisms, with optimization of vortex number yielding a tunneling distance of the order of the coherence length xi. Incorporating quantum fluctuations reveals a quantum phase transition to an insulating state for specific values of the dimensionless normal-state conductance g.