## Abstract

The ladder structure of the quasi-energy states of a one-dimensional semiconductor superlattice under combined dc-ac fields has been studied by calculating the absorption spectrum based on the semiconductor Bloch equations. In particular, we investigated the periodic motion of the carriers in a band under an ac field or a dc field. Under ac field with the frequency of ω_{L}, we found periodic motion of ω_{L}, which was very similar to the Bloch oscillation under the a dc field. The ladder structure of quasi-energy states with a ladder spacing ℏω_{L} under an ac field were shown to be the counterparts of the frequency domain of periodic motion. Under combined ac-dc fields, we found the absorption peaks corresponding to the so-called dynamical fractional Stark ladders with energies ∈_{o} + mℏω_{B} + m′ℏω_{L}, where m and m′ are integers and ω_{B} is the Bloch oscillation frequency.

Original language | English |
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Pages (from-to) | 614-617 |

Number of pages | 4 |

Journal | Journal of the Korean Physical Society |

Volume | 38 |

Issue number | 5 |

Publication status | Published - 2001 May |

## All Science Journal Classification (ASJC) codes

- Physics and Astronomy(all)