Giant and Helical Exciton Dipole from Berry Curvature in Flat Chern Bands
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The paper directly demonstrates that Berry curvature in a flat Chern band produces a giant helical exciton dipole, providing a concrete quantum-geometric control of an observable response.
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Author(s): Kaijie Yang, Huiyuan Zheng, Xiaodong Xu, Di Xiao, and Ting Cao Berry curvature in twisted molybdenum ditelluride drives the oppositely charged particles in an exciton in opposite transverse directions, producing a dipole moment of approximately 150 Debye. [Phys. Rev. Lett. 137, 126602] Published Tue Sep 15, 2026