DC current generation and power feature in strongly driven Floquet-Bloch systems

  title={DC current generation and power feature in strongly driven Floquet-Bloch systems},
  author={Qiang Gao and Yafei Ren and Q. Niu},
  journal={Physical Review Research},
We study the DC current generation in a periodically driven Bloch system connected to a heat bath. Under a relaxation time approximation, the density matrix for such a system is obtained, which is related to two equilibria: a Floquet quasi-equilibrium where the density matrix is diagonal under the Floquet-Bloch eigenbasis and an instantaneous Bloch thermal equilibrium. Then, the current responses and their power features, i.e. the power input behavior, are discussed in a unified manner, which… 

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