Article
Multidisciplinary Sciences
Haoxin Zhou, Ludwig Holleis, Yu Saito, Liam Cohen, William Huynh, Caitlin L. Patterson, Fangyuan Yang, Takashi Taniguchi, Kenji Watanabe, Andrea F. Young
Summary: Spin-polarized superconductivity is observed in Bernal bilayer graphene under a large applied perpendicular electric field. Electrostatic gate tuning leads to transitions between electronic phases with different polarizations in the spin space. A transition to a superconducting state is observed at a finite magnetic field, and the critical temperature is consistent with a spin-triplet order parameter.
Article
Multidisciplinary Sciences
Lin-Ding Yuan, Xiuwen Zhang, Carlos Mera Acosta, Alex Zunger
Summary: This article discusses the hidden spin polarization effect in collinear antiferromagnets without spin-orbit coupling and validates these symmetry enabling predictions with first-principles density functional calculations. This will boost the theoretical and experimental efforts in finding new spin-polarized materials.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
Jean-Lois Bello, Yassine Quessab, Jun-Wen Xu, Maxime Verges, Heloise Damas, Sebastien Petit-Watelot, Juan-Carlos Rojas Sanchez, Michel Hehn, Andrew D. Kent, Stephane Mangin
Summary: In this study, the switching of magnetization in Ir/GdFeCo/Cu/Pt heterostructures is observed at zero applied magnetic field, which is shown to be a result of the competition between spin-orbit torque, the Oersted field generated by the charge current, and the coercivity of the material. This finding provides a new approach for the design of future spintronics devices.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Simon Michel, Michael Potthoff
Summary: The geometrical Berry phase feedback in an electron system has a significant impact on the slow dynamics of classical degrees of freedom, which is determined by the Berry curvature. In this study, we investigate the local magnetic moments in a Chern insulator, modeled as classical spins, and explore their coupling to the Haldane model. We find an anomalous geometrical spin torque derived from the spin Berry curvature, which is non-zero due to the broken time-reversal symmetry in the condensed matter system. By developing a general theory and calculating the spin Berry curvature, we analyze its spatial structure, symmetry properties, distance dependence, as well as other characteristics. Moreover, we demonstrate that the magnitude of the spin Berry curvature is influenced by the insulating gap size, the system size, and the strength of local exchange coupling.
Article
Physics, Particles & Fields
Phung Van Dong, Duong Van Loi
Summary: The SU(3)L circle times U(1)X symmetry is directly broken to the electroweak symmetry SU(2)L circle times U(1)Y by a Higgs triplet, leading to new physics at TeV scale. In contrast, this study proposes that the higher weak isospin SU(3)L can be broken at a much higher energy scale by a Higgs octet, forming an intermediate symmetry SU(2)L circle times U(1)T8 at TeV, before being recombined with U(1)X to define U(1)Y by a Higgs singlet. The remaining nondecoupled physics presents a novel family-nonuniversal abelian model, U(1)T8 circle times U(1)X, which significantly modifies the standard model and provides consistent results for various phenomena.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Multidisciplinary
Jonathan B. Curtis, Nicholas R. Poniatowski, Yonglong Xie, Amir Yacoby, Eugene Demler, Prineha Narang
Summary: A recent experiment demonstrated that proximity-induced Ising spin-orbit coupling can enhance spin-triplet superconductivity in Bernal bilayer graphene. However, the fluctuations of the spin orientation of the triplet order parameter in graphene suppress the superconducting transition to nearly zero temperature due to its perfect spin rotation symmetry. Both Ising spin-orbit coupling and an in-plane magnetic field can eliminate these fluctuations, significantly increasing the transition temperature, as supported by our analysis and consistent with the experiment. Our model also suggests the existence of a phase with quasilong-range ordered spin-singlet charge 4e superconductivity at low anisotropy and magnetic field, while the triplet 2e superconducting order only exhibits short-ranged correlations. Relevant experimental signatures are discussed.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
J. P. Carlomagno, D. Gomez Dumm, N. N. Scoccola
Summary: The study uses a nonlocal PNJL model to analyze the features of strongly interacting matter in the presence of nonzero isospin chemical potential, describing the behavior of thermodynamic quantities and studying the phase diagram in the mu(I) - T plane. It is found that the system may be in an isospin symmetry broken phase under certain conditions, with results for the phase diagram being in better agreement with lattice QCD calculations than other theoretical approaches such as the local PNJL model.
Article
Physics, Multidisciplinary
Sergio C. de la Barrera, Samuel Aronson, Zhiren Zheng, Kenji Watanabe, Takashi Taniguchi, Qiong Ma, Pablo Jarillo-Herrero, Raymond Ashoori
Summary: This study demonstrates the existence of a cascade of symmetry-broken states with spontaneous spin and valley isospin ordering in bilayer graphene at zero magnetic field. These states are intrinsic to natural graphene bilayers and can be explored by independently tuning the carrier density and electric displacement field.
Article
Chemistry, Physical
Timothy J. Callow, Benjamin Pearce, Nikitas Gidopoulos
Summary: This paper investigates the behavior of electrons in zero external magnetic field using the Kohn-Sham scheme of density functional theory (DFT) or spin-density functional theory (SDFT). It is found that correcting the closed-shell approximation for open-shell systems allows the approximate DFT xc functionals to be as accurate as those in SDFT. Additionally, it is discovered that the KS equations of SDFT emerge as the generalized KS equations of DFT in the zero magnetic field limit, establishing a previously unknown link between the two theories.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Yang Zhang, Qiunan Xu, Klaus Koepernik, Roman Rezaev, Oleg Janson, Jakub Zelezny, Tomas Jungwirth, Claudia Felser, Jeroen van den Brink, Yan Sun
Summary: The study found a strong relationship between spin Hall conductivity (SHC) and crystalline symmetry, with large SHC typically associated with mirror symmetry-protected nodal line band structures. They also identified 11 materials with substantial SHC, comparable to or larger than that of Pt. Different types of spin currents were found, and it was discovered that they can be obtained by rotating applied electrical fields.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Physics, Multidisciplinary
Meng-Na Tang, Yong-Hui Lin, Feng-Kun Guo, Christoph Hanhart, Ulf-G. Meissner
Summary: The internal structure of charm-strange mesons D-s0*(2317) and D-s1(2460) is being extensively studied. Their narrow widths are due to their dominant decay through isospin-breaking hadronic channels. The decay of D-s1(2460) can also occur through hadronic final states with isospin conservation, but is strongly suppressed due to phase space limitations. By considering the Ds1(2460) as a D*K hadronic molecule, we find that the predicted partial widths and the pi(+)pi(-) invariant mass distribution are consistent with experimental measurements, and suggest possible ways to distinguish between the hadronic molecular and compact state pictures for the D-s1(2460)(+). Predictions for B-s1(0) -> B-s(0) pi(+) pi(-) are also made.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2023)
Article
Multidisciplinary Sciences
Eckart Marsch, Yasuhito Narita
Summary: A new approach to the Dirac equation and the associated hadronic symmetries is proposed, highlighting the use of the spinor-helicity representation. By expanding the standard Dirac equation with an inner abstract hadronic isospin, the occurrence of a quadruplet of inner states reveals the SU(4) symmetry. This leads to two independent fermion state spaces, interpreted as the U(1) symmetry of the leptons and the SU(3) symmetry of the three quarks.
Article
Multidisciplinary Sciences
Jie Yang, Jun Luo, Changjiang Yi, Youguo Shi, Yi Zhou, Guo-qing Zheng
Summary: K2Cr3As3 is a new type of spin-triplet superconductor with unique magnetic properties and superconducting behavior, making it a promising platform for the study of topological superconductivity and potential technological applications.
Article
Physics, Nuclear
J. Schmitt, G. B. King, R. G. T. Zegers, Y. Ayyad, D. Bazin, B. A. Brown, A. Carls, J. Chen, A. Davis, M. DeNudt, J. Droste, B. Gao, C. Hultquist, H. Iwasaki, S. Noji, S. Pastore, J. Pereira, M. Piarulli, H. Sakai, A. Stolz, R. Titus, R. B. Wiringa, J. C. Zamora
Summary: In this study, the (p, n) charge-exchange reaction was used to test the extraction of beta-Gamow-Teller transition strengths, B(GT), from proton-rich unstable isotopes. The results were compared to shell-model and ab initio calculations, and demonstrated the feasibility of using this method.
Article
Chemistry, Multidisciplinary
Dmitry Yu Aleshin, Rosa Diego, Leoni A. Barrios, Yulia Nelyubina, Guillem Aromi, Valentin V. Novikov
Summary: The study successfully observed the dynamics of two rare spin states, opening up new possibilities for information storage and processing.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Physics, Multidisciplinary
Maxim Mai, Ulf -G. Meissner, Carsten Urbach
Summary: In this review, the current understanding of the excited strongly interacting particle spectrum is presented. The systematic and model-independent calculation methods, namely lattice QCD and effective field theories, are discussed. The synergies between these approaches can provide a deeper understanding of the hadron spectrum. The use of the Breit-Wigner parametrization is shown to be inconsistent with chiral symmetry and should be avoided in strongly coupled channels.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Meng-Na Tang, Yong-Hui Lin, Feng-Kun Guo, Christoph Hanhart, Ulf-G. Meissner
Summary: The internal structure of charm-strange mesons D-s0*(2317) and D-s1(2460) is being extensively studied. Their narrow widths are due to their dominant decay through isospin-breaking hadronic channels. The decay of D-s1(2460) can also occur through hadronic final states with isospin conservation, but is strongly suppressed due to phase space limitations. By considering the Ds1(2460) as a D*K hadronic molecule, we find that the predicted partial widths and the pi(+)pi(-) invariant mass distribution are consistent with experimental measurements, and suggest possible ways to distinguish between the hadronic molecular and compact state pictures for the D-s1(2460)(+). Predictions for B-s1(0) -> B-s(0) pi(+) pi(-) are also made.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2023)
Article
Multidisciplinary Sciences
Shihang Shen, Serdar Elhatisari, Timo A. Laehde, Dean Lee, Bing-Nan Lu, Ulf-G. Meissner
Summary: The carbon atom is the backbone of organic chemistry and has a complex nucleus in its predominant isotope, C-12. In this study, a model-independent density map of the nuclear states of C-12 is provided using nuclear lattice effective field theory. The well-known Hoyle state is found to have a bent-arm or obtuse triangular arrangement of alpha clusters. All low-lying nuclear states of C-12 are identified as having an intrinsic shape composed of three alpha clusters forming either an equilateral triangle or an obtuse triangle.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Particles & Fields
Daniel Severt, Maxim Mai, Ulf-G. Meissner
Summary: We propose a new finite-volume approach based on an Effective Field Theory Lagrangian to implement two- and three-body dynamics in a transparent way. The formalism utilizes a particle-dimer picture and formulates the quantization conditions based on the self-energy of the decaying particle. The study focuses on the Roper resonance, utilizing input from lattice QCD and phenomenology, and predicts finite-volume energy eigenvalues, which are then compared to existing lattice QCD calculations as initial guidance for precision requirements.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
H. Alharazin, B. -d. Sun, E. Epelbaum, J. Gegelia, U. -g. Meissner
Summary: This article applies the definition of local spatial densities using sharply localized one-particle states to spin-3/2 systems. Matrix elements of the electromagnetic current and the energy-momentum tensor are considered, and integral expressions of associated spatial distributions in terms of form factors are derived.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
J. Yu. Panteleeva, E. Epelbaum, J. Gegelia, U. -G. Meissner
Summary: This paper considers the matrix elements of the electromagnetic current and energy-momentum tensor for spin-1 systems with sharply localized states. It discusses their interpretation as local spatial densities of various characteristics of the system in question.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Maral Salajegheh, Hamzeh Khanpour, Ulf-G. Meissner, Hadi Hashamipour, Maryam Soleymaninia
Summary: This study presents an updated set of SKMHS diffractive parton distribution functions (PDFs), including the recent diffractive dijet cross-section measurement. The new sets, SKMHS23 and SKMHS23-dijet, are presented at NLO and NNLO accuracy in perturbative QCD. The effect of diffractive dijet data and higher-order QCD corrections on the extracted PDFs and data/theory agreements are clearly examined and discussed.
Article
Physics, Multidisciplinary
Caleb Hicks, Dean Lee
Summary: Solving the generalized eigenvalue problem is a useful method for finding energy eigenstates of large quantum systems. However, the process is susceptible to small errors, especially when using stochastic methods with significant error bars. In this work, the trimmed sampling algorithm is introduced to overcome this problem by sampling prior probability distributions determined by uncertainty estimates and physics-informed constraints. The method provides a probability distribution for the eigenvectors and observables with reliable error estimates, outperforming standard regularization methods.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Nuclear
A. Zare, R. Wirth, C. A. Haselby, H. Hergert, M. Iwen
Summary: In this work, we propose a program that utilizes JLEs to reduce the computational cost and memory requirements of many-body methods. These embeddings allow for the compression of large tensors while preserving important structural features. Numerical experiments demonstrate the validity and potential of this approach, showing significant storage savings and computational efficiency improvements.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Physics, Nuclear
Johann Haidenbauer, Ulf-G. Meissner, Andreas Nogga, Hoai Le
Summary: A hyperon-nucleon potential for the S = -1 sector up to third order in the chiral expansion is introduced, considering both the SU(3) flavor symmetry and explicit SU(3) symmetry breaking. An innovative regularization scheme is used, leading to an excellent description of scattering data and the analysis of new data from J-PARC. Results for hypertriton and A = 4 hyper-nuclear separation energies are presented, along with an uncertainty estimate for selected observables in the hyperon-nucleon system.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Physics, Nuclear
Yong-Hui Lin, Hans-Werner Hammer, Ulf-G. Meissner
Summary: Using dispersion theory, the Sigma-to-Lambda transition form factors in electromagnetic interactions are calculated considering the pion electromagnetic form factor, SU(3) chiral perturbation theory, the baryon decuplet, and the pi pi- K coupled-channel effect. The electric form factor is significantly affected by the inclusion of the K channel, while the magnetic form factor is minimally affected. The uncertainties in the three-flavor chiral perturbation theory are estimated using a bootstrap sampling method.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Physics, Particles & Fields
Chao-Wei Shen, Yong-hui Lin, Ulf-G. Meissner
Summary: Using an effective Lagrangian with heavy quark spin symmetry, this study investigates the coupled-channel dynamics of the doubly charmed systems D-(*) Sigma((*))(c). The potential considered includes exchanges of pseudoscalar and vector mesons in the t-channel. By applying the first iterated solution of the N/ D method, several S-wave bound states with isospin I = 1/2 are discovered. These states correspond to open-charm partners of the hidden charm pentaquarks P-psi(N) observed by the LHCb Collaboration.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
J. Yu. Panteleeva, E. Epelbaum, J. Gegelia, U-G Meissner
Summary: Using spherically symmetric sharply localized wave packets, we determine the details of defining the spatial densities corresponding to the gravitational form factors of spin-0 and spin-1/2 systems. The expressions for the spatial densities are provided in the frames with both zero and non-zero expectation values of the momentum operator.
EUROPEAN PHYSICAL JOURNAL C
(2023)
