• DOI:10.1103/PhysRevLett.126.027601
• Corpus ID: 220936397

Topological Charge Pumping in Excitonic Insulators.

@article{Sun2020TopologicalCP,
  title={Topological Charge Pumping in Excitonic Insulators.},
  author={Zhiyuan Sun and Andrew J. Millis},
  journal={Physical review letters},
  year={2020},
  volume={126 2},
  pages={
          027601
        }
}

• Zhiyuan Sun, A. Millis
• Published 1 August 2020
• Physics
• Physical review letters

We show that in excitonic insulators with s-wave electron-hole pairing, an applied electric field (either pulsed or static) can induce a p-wave component to the order parameter, and further drive it to rotate in the s+ip plane, realizing a Thouless charge pump. In one dimension, each cycle of rotation pumps exactly two electrons across the sample. Higher dimensional systems can be viewed as a stack of one-dimensional chains in momentum space in which each chain crossing the Fermi surface contributes a channel of charge pumping. Physics beyond the adiabatic limit, including in particular dissipative effects is discussed.