Quantum geometric exciton drift velocity

@article{Cao2020QuantumGE,
  title={Quantum geometric exciton drift velocity},
  author={Jinlyu Cao and Herbert A. Fertig and Luis Brey},
  journal={arXiv: Mesoscale and Nanoscale Physics},
  year={2020}
}
We show that the dipole moment of an exciton is uniquely determined by the quantum geometry of its eigenstates, and demonstrate its intimate connection with a quantity we call the dipole curvature. The dipole curvature arises naturally in semiclassical dynamics of an exciton in an electric field, adding a term additional to the anomalous velocity coming from the Berry's curvature. In a uniform electric field this contributes a drift velocity akin to that expected for excitons in crossed… 
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