Article
Materials Science, Multidisciplinary
Z. Feng, J. Si, T. Li, H. Dong, C. Xu, J. Yang, Z. Zhang, K. Wang, H. Wu, Q. Hou, J-J Xing, S. Wan, S. Li, W. Deng, J. Feng, A. Pal, F. Chen, S. Hu, J-Y Ge, C. Dong, S. Wang, W. Ren, S. Cao, Y. Liu, X. Xu, J. Zhang, B. Chen, N-C Yeh
Summary: This study demonstrates that pressure can induce two-phase superconductivity and suggests the critical role of Te vacancies in the occurrence of superconductivity in NiTe2-x. The coexistence of hexagonal and monoclinic structures and the presence of two-phase superconductivity are key findings in this research.
MATERIALS TODAY PHYSICS
(2021)
Article
Physics, Multidisciplinary
An-Lei Zhang, Li-Xin Gao, Jing-Yu He, Volodimir B. Filipov, Shixun Cao, Qi-Ling Xiao, Jun-Yi Ge
Summary: By combining macroscopic and microscopic measurements, this study investigates the superconducting properties and vortex matter of ZrB12. The vortex phase diagram is constructed and the existence of surface superconductivity and semi-Meissner state is revealed, both attributed to the weakly coupled two-band effect.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Materials Science, Multidisciplinary
G. Singh, G. Venditti, G. Saiz, G. Herranz, F. Sanchez, A. Jouan, C. Feuillet-Palma, J. Lesueur, M. Grilli, S. Caprara, N. Bergeal
Summary: The discovery of interfacial superconductivity in LaAlO3/SrTiO3 heterostructures has reignited interest in the superconductivity of doped SrTiO3 after decades of debate. The complex band structure and tunable occupancy of different orbital symmetries make these interfaces promising for multigap superconductivity.
Article
Optics
Masahiro Hitaka, Kazuyoshi Hirose, Takahiro Sugiyama, Akio Ito
Summary: A 1.5 pm laser diode has practical applications in eye-safe LiDAR and optical communications. By using n-type doping and an NPN-type PCSEL structure, the output power of a 1.5 pm PCSEL was increased to 100 mW, exceeding previous reported values by two orders of magnitude.
Article
Materials Science, Multidisciplinary
Xu Li, Hao Tian, Hong Jian Zhao, Changsong Xu, Meng Ye, Lan Chen, Hongjun Xiang, Di Wu, Yurong Yang, Jun-Ming Liu, L. Bellaiche
Summary: The Rashba-type and Zeeman effects in the two-dimensional three-atom-layer structures XTe/MnTe/X Te are found to cooperate and improve each other, which is crucial for the realization of stable Majorana fermions and topological superconductivity.
Article
Physics, Applied
Yuee Xie, Yujiao Kang, Siwen Li, Xiaohong Yan, Yuanping Chen
Summary: The research proposes a method to achieve phase transition between type-I and type-II Dirac semimetals in 2D materials by tuning external strains. Two 2D nanosheets were identified through first-principles calculations to confirm the mechanism. Additionally, a possible routine for synthesizing the new 2D structures was proposed.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
A. A. Slobodchikov, I. A. Nekrasov, N. S. Pavlov, M. M. Korshunov
Summary: The band structure, density of states, and Fermi surface of the oxygen-deficient tungsten oxide WO2.9 (equivalent to W20O58) were studied using density functional theory. Despite the complexity of the structure, the low-energy band structure is feasible, mainly influenced by specific distortions in the structure.
Article
Multidisciplinary Sciences
Fei Wang, Yang Zhang, Zhijie Wang, Haoxiong Zhang, Xi Wu, Changhua Bao, Jia Li, Pu Yu, Shuyun Zhou
Summary: In this study, the authors demonstrate a self-intercalation method driven by ionic liquid gating to obtain high-quality PdTe and NiTe single crystals from PdTe2 and NiTe2, respectively. This synthesis pathway for transition metal monochalcogenides provides new opportunities for exploring their unique properties, such as emergent superconductivity.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Florian Simon, Marc Gabay, Mark O. Goerbig, Louis Pagot
Summary: This article theoretically investigates the impact of Berry curvature on the superconducting properties of two-dimensional electronic systems. The authors show that Berry curvature provides additional terms in the Hamiltonian describing interacting electrons within a single band, modifying the coupling constant and lowering the superconducting gap and critical temperature as a function of doping.
Article
Materials Science, Multidisciplinary
C. M. N. Kumar, A. Akrap, C. C. Homes, E. Martino, B. Klebel-Knobloch, W. Tabis, O. S. Barisic, D. K. Sunko, N. Barisic
Summary: Understanding the physical properties of unconventional superconductors and other correlated materials is challenging due to their unconventional evolution with doping, frequency, and temperature. This study focuses on the optical spectra of two typical cuprates, underdoped HgBa2CuO4+delta and optimally doped Bi2Sr2CaCu2O8+delta, and interprets them based on the standard Fermi-liquid paradigm. The presence of a second, gapped electronic subsystem modifies the perfect frequency-temperature Fermi-liquid scaling at both dopings. This non-Fermi-liquid component emerges as a distinct mid-infrared spectral feature after subtracting the Fermi-liquid contribution. The temperature, frequency, and doping dependence of this feature indicate a gapped rather than dissipative response.
Article
Physics, Multidisciplinary
Siheon Ryee, Myung Joon Han, Sangkook Choi
Summary: Motivated by the discovery of superconductivity in infinite-layer nickelates, this study investigates the role of Hund coupling J in a quarter-filled two-orbital Hubbard model. The results reveal distinctive regimes of correlated metals, with one related to Mott insulator proximity. Defines criteria for characterizing these metals, establishing the existence of Hund metallicity in two-orbital systems.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Tatsuya Shishidou, Han Gyeol Suh, P. M. R. Brydon, Michael Weinert, Daniel F. Agterberg
Summary: UTe2 is a likely spin-triplet superconductor with evidence for chiral Majorana edge states. It features inversion-symmetry related pairs of U atoms forming rungs of ladders. Each rung's two sublattice degrees of freedom play a key role in understanding the electronic structure and the origin of superconductivity.
Article
Chemistry, Inorganic & Nuclear
Conrad H. R. Gillard, Xiuquan Zhou, Maxim Avdeev, Efrain E. Rodriguez, Neeraj Sharma
Summary: The research focuses on the reaction mechanism of anti-PbO type CoSe in Li, Na, and K ion half cells. The study shows that intercalation followed by a conversion reaction occur in all systems, with Li, Na, and K demonstrating high initial capacities but significantly lower second discharge capacities. This is likely attributed to volume changes and irreversibility associated with conversion and intercalation reactions, with the study correlating electrochemical features to structural evolution, magnetic properties, and reaction mechanisms.
INORGANIC CHEMISTRY
(2021)
Article
Multidisciplinary Sciences
Martin R. Otto, Jan-Hendrik Pohls, Laurent P. Rene de Cotret, Mark J. Stern, Mark Sutton, Bradley J. Siwick
Summary: This study investigates the electron-phonon coupling phenomena in 1T-TiSe2 using ultrafast electron diffuse scattering, distinguishing the contributions to phonon softening from different mechanisms. By selectively photo-doping carriers into the electron pocket, the researchers observe specific renormalization of soft zone-boundary phonon frequencies followed by electron-phonon equilibration.
Article
Materials Science, Multidisciplinary
San-Jun Zhang, Da Wang, Qiang-Hua Wang
Summary: Recent experiments in Sr2RuO4 suggest the presence of a multicomponent pairing function, with a theoretical cusp in the transition temperature Tc that can be easily smeared out by spatial inhomogeneity of strain. Experimental data can be qualitatively reproduced by a percolation model. Additionally, a thorough group-theoretical classification of the pairing functions reveals two types of intraorbital pairings that are favorable in view of most existing experiments.
Article
Physics, Particles & Fields
Julien Garaud, Jin Dai, Antti J. Niemi
Summary: Vortices in a Bose-Einstein condensate are modeled as minimum energy solutions of the Gross-Pitaevskii equation, with their behavior influenced by the conserved angular momentum of the entire condensate. A symmetric pair of identical vortices engages in an emergent gauge field in their relative coordinate, with a flux equal to the ratio between precession and shift velocities.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Mathematical
Filipp N. Rybakov, Egor Babaev
Summary: The article discussed the Gor'kov microscopic derivation and extension of the GL model, investigating whether the extended GL model can describe local minima solutions of superconducting states.
JOURNAL OF MATHEMATICAL PHYSICS
(2021)
Article
Physics, Multidisciplinary
I. Bobkova, A. M. Bobkov, M. A. Silaev
Summary: Recent research focuses on ordered states that appear exclusively under time-dependent drives in quantum matter. A class of systems featuring dynamic spin-triplet superconducting order stimulated by alternating electric fields have been demonstrated. This effect is based on the interplay of ferromagnetism, interfacial spin-orbital coupling, and condensate motion driven by the field, converting hidden static p-wave order into dynamic s-wave equal-spin triplet correlations.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Remko Fermin, Dyon van Dinter, Michel Hubert, Bart Woltjes, Mikhail Silaev, Jan Aarts, Kaveh Lahabi
Summary: This study develops nanostructured Josephson junctions with highly controllable spin texture and induces long-range triplet (LRT) superconductivity in a ferromagnet through the interaction between the vortex magnetization of Co and the Cooper pairs of Nb. Surprisingly, the LRT correlations emerge only in highly localized channels at the rim of the ferromagnet, despite its trivial band structure.
Article
Physics, Multidisciplinary
Risto Ojajarvi, F. S. Bergeret, M. A. Silaev, Tero T. Heikkila
Summary: This paper investigates the influence of spin supercurrent phenomenon between superconductor and ferromagnet on magnetization dynamics. By observing magnetic hysteresis and ferromagnetic resonance response in experiments, the analog of the current-phase relation is determined and the mechanism of spin supercurrent is explored.
PHYSICAL REVIEW LETTERS
(2022)
Review
Physics, Condensed Matter
I. Bobkova, A. M. Bobkov, M. A. Silaev
Summary: The review focuses on the fundamental aspects and characteristic features of magnetoelectric effects in Josephson junctions (JJs), discussing the direct and inverse magnetoelectric effects in various types of Josephson systems. It highlights the coupling of magnetization in JJs with the Josephson current and the importance of these effects for electrical control of magnetization. Additionally, the review explores the perspectives of coupling magnetization in JJs with ferromagnetic interlayers to the Josephson current through magnetoelectric effects.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Physics, Multidisciplinary
Julien Garaud, Egor Babaev
Summary: Based on recent experiments, this study derives an effective model to describe the spontaneous magnetic fields observed in the condensate of four-fermion composites. The model, similar to the Faddeev-Skyrme model, is shown to be capable of accommodating topological excitations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Particles & Fields
Julien Garaud, Antti J. Niemi
Summary: The characteristics of Bose-Einstein condensed atoms in a non-rotated and axially symmetric harmonic trap were studied, including vortices, antivortices, stagnation points, and their interrelationships.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Applied
Mikhail Silaev
Summary: The study demonstrates the spectroscopic manifestation of the Anderson-Higgs mass in superconductor/ferromagnet/superconductor multilayers, and the observed spontaneous ferromagnetic resonance frequency shift in recent experiments. The theory explains many experimental features and suggests effective control over the magnon spectrum with tunable spectral gap and group velocity reversal.
PHYSICAL REVIEW APPLIED
(2022)
Article
Astronomy & Astrophysics
Maxim N. Chernodub, Julien Garaud, Dmitri E. Kharzeev
Summary: Our paper explores the Chiral Magnetic Josephson junction (CMJ junction) composed of two non-centrosymmetric superconductors connected by a uniaxial ferromagnet. This structure shows an analog of the Chiral Magnetic Effect and has potential applications as a qubit with a tunable Hamiltonian. The CMJ junction offers a simpler and more robust architecture without the need for an offset magnetic flux, providing strong protection against noise from magnetization fluctuations.
Article
Materials Science, Multidisciplinary
Yao Lu, Risto Ojajarvi, P. Virtanen, M. A. Silaev, Tero T. Heikkila
Summary: We demonstrate that the Higgs mode and spin dynamics can couple together in superconductors with a static spin-splitting field and Rashba spin-orbit coupling. This coupling greatly modifies the spin susceptibility near the superconducting critical temperature and enhances the spin pumping effect in a ferromagnetic insulator/superconductor bilayer system. We also show that this effect can be detected by measuring the magnon transmission rate and the magnon-induced voltage through the inverse spin Hall effect.
Article
Materials Science, Multidisciplinary
Fredrik Nicolai Krohg, Egor Babaev, Julien Garaud, Havard Homleid Haugen, Asle Sudbo
Summary: The study uses large-scale Monte-Carlo simulations to investigate thermal fluctuations in chiral p-wave superconductors in an applied magnetic field, finding that the dissociation of double-quanta vortices is driven by thermal fluctuations. However, the calculations also show that the previous predictions of hexagonal doubly-quantized vortices, where thermal fluctuations were ignored, are very robust in the considered model.
Article
Physics, Multidisciplinary
Emil Blomquist, Johan Carlstrom
Summary: Recent advances in optically trapped ultracold atomic gases have enabled access to microscopic observables in doped Mott insulators, addressing questions about attraction between charge carriers and their mechanisms. By employing the worm-algorithm Monte Carlo method, unbiased results for two charge carriers in a Mott insulator have been obtained, allowing access to lower temperatures than current experiments and providing evidence for attraction between dopants at feasible temperature scales in ultracold atomic systems.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Martin Speight, Thomas Winyard
Summary: The standard Ginzburg-Landau model of competing-order superconductors, which is applicable to various high T-c cuprates, was studied and found to possess two distinct species of vortex with integer valued topological charges. A simple point particle model of long-range forces between (anti)vortices was developed and compared with numerical simulations, showing excellent agreement. Surprisingly, there is a parameter regime where vortices of one species repel both vortices and antivortices of the other species.
Article
Physics, Multidisciplinary
A. Vargunin, M. A. Silaev, E. Babaev