TY - JOUR

T1 - Time-dependence of quasi-energy states and dynamical fractional stark ladders in semiconductor superlattice

AU - Je, Koo Chul

AU - Park, Seung Han

AU - Kim, Yup

N1 - Copyright:
Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.

PY - 2001/5

Y1 - 2001/5

N2 - 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 ωL, we found periodic motion of ωL, which was very similar to the Bloch oscillation under the a dc field. The ladder structure of quasi-energy states with a ladder spacing ℏωL 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 + mℏωB + m′ℏωL, where m and m′ are integers and ωB is the Bloch oscillation frequency.

AB - 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 ωL, we found periodic motion of ωL, which was very similar to the Bloch oscillation under the a dc field. The ladder structure of quasi-energy states with a ladder spacing ℏωL 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 + mℏωB + m′ℏωL, where m and m′ are integers and ωB is the Bloch oscillation frequency.

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M3 - Article

AN - SCOPUS:0035343826

VL - 38

SP - 614

EP - 617

JO - Journal of the Korean Physical Society

JF - Journal of the Korean Physical Society

SN - 0374-4884

IS - 5

ER -