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Final COMPASS Results on the Transverse-Spin-Dependent Azimuthal Asymmetries in the Pion-Induced Drell-Yan Process.
Phys Rev Lett
August 2024
Warsaw University of Technology, Institute of Radioelectronics, 00-665 Warsaw, Poland.
The COMPASS Collaboration performed measurements of the Drell-Yan process in 2015 and 2018 using a 190 GeV/c π^{-} beam impinging on a transversely polarized ammonia target. Combining the data of both years, we present final results on the amplitudes of five azimuthal modulations, which correspond to transverse-spin-dependent azimuthal asymmetries (TSAs) in the dimuon production cross section. Three of them probe the nucleon leading-twist Sivers, transversity, and pretzelosity transverse-momentum dependent (TMD) parton distribution functions (PDFs).
View Article and Find Full Text PDFSeparation of Inverse Altermagnetic Spin-Splitting Effect from Inverse Spin Hall Effect in RuO_{2}.
Phys Rev Lett
August 2024
Center of Atomic Initiatives for New Materials, National Taiwan University, Taipei 10617, Taiwan.
Recently, a significant amount of attention has been attracted toward a third classification of magnetism, altermagnetism, due to the unique physical properties of altermagnetic materials, which are compensated collinear antiferromagnets that host time-reversal symmetry-breaking phenomena like a ferromagnet. In an altermagnetic material, through the nonrelativistic altermagnetic spin-splitting effect (ASSE), a transverse spin current is generated upon charge current injection. However, it is very challenging to experimentally establish the ASSE since it is inevitably mixed with the spin Hall effect due to the relativistic spin-orbit coupling of the material.
View Article and Find Full Text PDFSpin-photon interaction in a nanowire quantum dot with asymmetrical confining potential.
J Phys Condens Matter
February 2024
Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, People's Republic of China.
The electron (hole) spin-photon interaction is studied in an asymmetrical InSb (Ge) nanowire quantum dot. The spin-orbit coupling in the quantum dot mediates not only a transverse spin-photon interaction, but also a longitudinal spin-photon interaction due to the asymmetry of the confining potential. Both the transverse and the longitudinal spin-photon interactions have non-monotonic dependence on the spin-orbit coupling.
View Article and Find Full Text PDFSingle Transverse Spin Asymmetry as a New Probe of Standard-Model-Effective-Field-Theory Dipole Operators.
Phys Rev Lett
December 2023
Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
Electroweak dipole operators in the standard-model-effective-field theory (SMEFT) are important indirect probes of quantum effects of new physics beyond the standard model (SM), yet they remain poorly constrained by current experimental analyses for lack of interference with the SM amplitudes in constructing cross section observables. In this Letter, we point out that dipole operators flip fermion helicities and so are ideally studied through single transverse spin asymmetries. We illustrate this at a future electron-positron collider with transversely polarized beams, where such an effect exhibits as azimuthal cosϕ and sinϕ distributions which originate from the interference of the electron dipole operators with the SM and are linearly dependent on their Wilson coefficients.
View Article and Find Full Text PDFThermally generated spin current in the topological insulator BiSe.
Sci Adv
December 2023
Department of Physics, Cornell University, Ithaca, NY 14853, USA.
We present measurements of thermally generated transverse spin currents in the topological insulator BiSe, thereby completing measurements of interconversions among the full triad of thermal gradients, charge currents, and spin currents. We accomplish this by comparing the spin Nernst magneto-thermopower to the spin Hall magnetoresistance for bilayers of BiSe/CoFeB. We find that BiSe does generate substantial thermally driven spin currents.
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