Tracking Berry curvature effect in molecular dynamics by ultrafast magnetic x-ray scattering

• URL: http://arxiv.org/abs/2307.06523v1
• Date: Thu, 13 Jul 2023 01:52:56 GMT
• Title: Tracking Berry curvature effect in molecular dynamics by ultrafast magnetic x-ray scattering
• Authors: Ming Zhang, Xiaoyu Mi, Linfeng Zhang, Chengyin Wu, Zheng Li
• Abstract summary: spin-dependent Berry force is a genuine effect of Berry curvature in molecular dynamics. In molecular photodissociation, dissociation rates can be different for molecules with opposite initial spin directions due to Berry force. We showcase that the spatially separated spin density, which is transiently induced by Berry force, can be reconstructed from the circular dichroism of ultrafast non-resonant magnetic x-ray scattering.
• Score: 11.857269615893525
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The spin-dependent Berry force is a genuine effect of Berry curvature in molecular dynamics, which can dramatically result in spatial spin separation and change of reaction pathways. However, the way to probe the effect of Berry force remains challenging, because the time-reversal (TR) symmetry required for opposite Berry forces conflicts with TR symmetry breaking spin alignment needed to observe the effect, and the net effect could be transient for a molecular wave packet. We demonstrate that in molecular photodissociation, the dissociation rates can be different for molecules with opposite initial spin directions due to Berry force. We showcase that the spatially separated spin density, which is transiently induced by Berry force as the molecular wave packet passes through conical intersection, can be reconstructed from the circular dichroism (CD) of ultrafast non-resonant magnetic x-ray scattering using free electron lasers.

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