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Ab Initio Simulation for Large Scale Spin Texture
Ab Initio Simulation for Large Scale Spin Texture
Noncollinear spin pattern presents distinct physical propeties in contrast to their collinear counterparts. Exchange forces, including Dzyaloshinskii–Moriya (DM) interaction and Ruderman–Kittel–Kasuya–Yosida (RKKY) interaction, reduce the configuratioin energies among spins in a noncollinear alignment, stabilizing spin textures such as spin spiral (1D), skyrmion (2D) and Hopfion (3D). These spin structures introduce tunable symmetry breaking on top of the crystalline structure, raising novel emergent phenomena, such as topological Hall effect and nonlinear optics.
H.-Y. Chen, T. Nomoto, M. Hirschberger, R. Arita, Topological Hall Effect of Skyrmions from first Principles, Physical Review X 15 011054
H.-Y. Chen, R. Arita, Y. Nomura, First-Principles Approach to Spin Excitations in Noncollinear Magnetic Systems, npj. Comput. Mater. accepted. arXiv:2510.14405
Exciton Dynamics
Exciton Dynamics
H.-Y. Chen, M. Palummo, D. Sangalli, M. Bernardi, Theory and Ab Initio Computation of the Anisotropic Light Emission in Monolayer Transition Metal Dichalcogenides. Nano Letters 2018, 18, 3839
H.-Y Chen, V.A. Jhalani, M. Palummo, M. Bernardi, Ab initio calculations of exciton radiative lifetimes in bulk crystals, nanostructures, and molecules, Physical Review B 2019, 100, 075135
V.A. Jhalani, H.-Y Chen, M. Palummo, M. Bernardi, Precise Radiative Lifetimes in Bulk Crystals from First Principles: The Case of Wurtzite GaN, Journal of Physics: Condensed Matter 2019 32, 084001.
H.-Y. Chen, D. Sangalli, M. Bernardi, Exciton-Phonon Interactions and Relaxation Times from First Principles. Physical Review Letters 2020 125, 107401.
H.-Y. Chen, D. Sangalli and M. Bernardi, First-principles ultrafast exciton dynamics and time-domain spectroscopies: Dark-exciton mediated valley depolarization in monolayer WSe2, Physical Review Research 2022 4, 043203.
H.-Y. Chen, T. Nomoto, R. Arita, Development of ab initio method for exciton condensation and its application to TiSe2, Physical Review Research 2023 5 , 043183
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