Direct observation of geometric phase in dynamics around a conical intersection

• URL: http://arxiv.org/abs/2211.07320v3
• Date: Fri, 11 Aug 2023 05:07:33 GMT
• Title: Direct observation of geometric phase in dynamics around a conical intersection
• Authors: Christophe H. Valahu and Vanessa C. Olaya-Agudelo and Ryan J. MacDonell and Tomas Navickas and Arjun D. Rao and Maverick J. Millican and Juan B. P\'erez-S\'anchez and Joel Yuen-Zhou and Michael J. Biercuk and Cornelius Hempel and Ting Rei Tan and Ivan Kassal
• Abstract summary: We experimentally observe geometric-phase interference in the dynamics of a wavepacket travelling around an engineered conical intersection. We develop a technique to reconstruct the two-dimensional wavepacket densities of a trapped ion. Experiments agree with the theoretical model, demonstrating the ability of analog quantum simulators to accurately describe nuclear quantum effects.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Conical intersections are ubiquitous in chemistry and physics, often governing processes such as light harvesting, vision, photocatalysis, and chemical reactivity. They act as funnels between electronic states of molecules, allowing rapid and efficient relaxation during chemical dynamics. In addition, when a reaction path encircles a conical intersection, the molecular wavefunction experiences a geometric phase, which can affect the outcome of the reaction through quantum-mechanical interference. Past experiments have measured indirect signatures of geometric phases in scattering patterns and spectroscopic observables, but there has been no direct observation of the underlying wavepacket interference. Here, we experimentally observe geometric-phase interference in the dynamics of a wavepacket travelling around an engineered conical intersection in a programmable trapped-ion quantum simulator. To achieve this, we develop a technique to reconstruct the two-dimensional wavepacket densities of a trapped ion. Experiments agree with the theoretical model, demonstrating the ability of analog quantum simulators -- such as those realised using trapped ions -- to accurately describe nuclear quantum effects.

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