Sensitive experiments have been developed that search for electric dipole moments of atoms, molecules, and the neutron. These experiments play an important role in deciding which of the myriad theoretical models correctly describes violations of the principle of time-reversal invariance.
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Coalescence of multiple topological orders in quasi-one-dimensional bismuth halide chains.
Nat Commun
January 2025
School of Physics, Beihang University, Haidian District, Beijing, China.
Topology is being widely adopted to understand and to categorize quantum matter in modern physics. The nexus of topology orders, which engenders distinct quantum phases with benefits to both fundamental research and practical applications for future quantum devices, can be driven by topological phase transition through modulating intrinsic or extrinsic ordering parameters. The conjoined topology, however, is still elusive in experiments due to the lack of suitable material platforms.
View Article and Find Full Text PDFTransverse Momentum Distributions from Lattice QCD without Wilson Lines.
Phys Rev Lett
December 2024
Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA.
The transverse-momentum-dependent distributions (TMDs), which are defined by gauge-invariant 3D parton correlators with staple-shaped lightlike Wilson lines, can be calculated from quark and gluon correlators fixed in the Coulomb gauge on a Euclidean lattice. These quantities can be expressed gauge invariantly as the correlators of Coulomb-gauge-dressed fields, which reduce to the standard TMD correlators under principal-value prescription in the infinite boost limit. In the framework of large-momentum effective theory, a quasi-TMD defined from such correlators in a large-momentum hadron state can be matched to the TMD via a factorization formula, whose exact form is derived using soft collinear effective theory and verified at one-loop order.
View Article and Find Full Text PDFNon-Abelian lattice gauge fields in photonic synthetic frequency dimensions.
Nature
January 2025
Edward L. Ginzton Laboratory, Stanford University, Stanford, CA, USA.
Article Synopsis
- Non-Abelian gauge fields play a crucial role in explaining spin-related phenomena across various fields of physics, and lattice models help in exploring their applications.
- Researchers successfully demonstrated SU(2) lattice gauge fields for photons in synthetic frequency dimensions, marking a significant advancement since this had not been previously achieved.
- The study reveals the properties of these lattice gauge fields, such as Dirac cones and their implications for topological physics, which could enhance photonic technologies by controlling photon spins in innovative ways.
Manipulating Floquet-driven topological insulator with off-resonant elliptically polarized light in presence of hexagonal Fermi surface warping.
J Phys Condens Matter
December 2024
Department of Physics, University of Allahabad, Prayagraj 211002, India.
The irradiation of topological insulator surface with elliptically polarized light modifies the topological properties in a phase-dependent manner impacting the Floquet Chern number which is a crucial topological invariant associated with such driven systems. Employing Floquet theory in presence of hexagonal warping term in the Dirac fermion Hamiltonian under off-resonant conditions, we derive an effective Hamiltonian that highlights distinct features in the Floquet-Dirac surface states. Specifically, we identify a helicity and ellipticity-dependent mass term in the quasi-static Hamiltonian, breaking time reversal symmetry.
View Article and Find Full Text PDFSynthetic Microwave Focusing Techniques for Medical Imaging: Fundamentals, Limitations, and Challenges.
Biosensors (Basel)
October 2024
School of EECS, The University of Queensland, St Lucia, QLD 4072, Australia.
Synthetic microwave focusing methods have been widely adopted in qualitative medical imaging to detect and localize anomalies based on their electromagnetic scattering signatures. This paper discusses the principles, challenges, and limitations of synthetic microwave-focusing techniques in medical applications. It is shown that the various focusing techniques, including time reversal, confocal imaging, and delay-and-sum, are all based on the scalar solution of the electromagnetic scattering problem, assuming the imaged object, i.
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