Pengtao Yang

Apr 17, 2024 | link.aps.org | Shuxiang Xu |Ziyi Liu |Pengtao Yang

We report on crystal growth and physical properties of the quasi-one-dimensional compound Bi19S27I3 by combining crystal structure, electrical resistivity, magnetic properties, Seebeck coefficient, Hall coefficient as well as hydrostatic pressure effect up to 11.5 GPa. Unlike p-type Bi19S27I3 crystals, the maximum size of high-quality n-type Bi19S27I3 crystals can reach 2–3 mm by optimizing the chemical vapor transport method.

Feb 16, 2024 | nature.com | Rui Lou |Alexander Fedorov |Pengtao Yang |Bosen Wang |Yang Xu |Weiwei Zhao | +7 more

AbstractThe noncentrosymmetric ferromagnetic Weyl semimetal CeAlSi with simultaneous space-inversion and time-reversal symmetry breaking provides a unique platform for exploring novel topological states. Here, by employing multiple experimental techniques, we demonstrate that ferromagnetism and pressure can serve as efficient parameters to tune the positions of Weyl nodes in CeAlSi. At ambient pressure, a magnetism-facilitated anomalous Hall/Nernst effect (AHE/ANE) is uncovered.

Jan 17, 2024 | link.aps.org | Yi Liu |Beijing Normal |Pengtao Yang |Paul Kelly

Abstract A systematic, computational study of the Gilbert damping in Co|Ni,Co|Pd, and Co|Pt multilayers is carried out using first-principles scattering calculations. The damping we find shows little temperature dependence and agrees well with experimental findings only when the interface damping enhancement is taken into account. In the absence of this extrinsic enhancement, the intrinsic damping of bulklike Co|Ni multilayers increases linearly with increasing ratio of Ni to Co layers.