Berry curvature signatures in chiroptical excitonic transitions

Samuel Beaulieu; Shuo Dong; Viktor Christiansson; Philipp Werner; Tommaso Pincelli; Jonas D. Ziegler; Takashi Taniguchi; Kenji Watanabe; Alexey Chernikov; Martin Wolf; Laurenz Rettig; Ralph Ernstorfer; Michael Schüler

doi:10.1126/sciadv.adk3897

論文 Berry curvature signatures in chiroptical excitonic transitions

Samuel Beaulieu ; Shuo Dong ; Viktor Christiansson ; Philipp Werner ; Tommaso Pincelli ; Jonas D. Ziegler ; Takashi Taniguchi (National Institute for Materials Science) ; Kenji Watanabe (National Institute for Materials Science) ; Alexey Chernikov ; Martin Wolf ; Laurenz Rettig ; Ralph Ernstorfer ; Michael Schüler

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Samuel Beaulieu, Shuo Dong, Viktor Christiansson, Philipp Werner, Tommaso Pincelli, Jonas D. Ziegler, Takashi Taniguchi, Kenji Watanabe, Alexey Chernikov, Martin Wolf, Laurenz Rettig, Ralph Ernstorfer, Michael Schüler. Berry curvature signatures in chiroptical excitonic transitions. Science Advances. 2024, 10 (26), eadk3897. https://doi.org/10.1126/sciadv.adk3897

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The topology of the electronic band structure of solids can be described by its Berry curvature distribution across the Brillouin zone. We theoretically introduce and experimentally demonstrate a general methodology based on the measurement of energy- and momentum-resolved optical transition rates, allowing to reveal signatures of Berry curvature texture in reciprocal space. By performing time- and angle-resolved photoemission spectroscopy of atomically thin WSe become an asset in extracting the quantum geometrical properties of solids. We also investigate the resilience of our measurement protocol against ultrafast scattering processes following direct chiroptical transitions.

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