Optical absorption spectra and dynamical fractional Stark ladders in semiconductor superlattices
The optical response of semiconductor heterostructure under a combined dc-ac fields, F{sub dc}+F{sub ac}cos{omega}{sub L}t, is studied by calculating absorption spectra based on semiconductor Bloch equations. First, we investigate the periodic motion of the carrier in a band under a ac field or dc field. Under the ac field with the frequency {omega}{sub L}, we find the periodic motion of {omega}{sub L}, which is very similar to the Bloch oscillation under the dc field. The ladder spacing of quasienergy states under the ac field is observed to be {Dirac_h}{omega}{sub L}. Under combined ac-dc fields, we discover the absorption peaks corresponding to the so-called dynamical fractional Stark ladders with ladder spacing m{Dirac_h}{omega}{sub B}+m{prime}{Dirac_h}{omega}{sub L} where m and m{prime} are integers and {omega}{sub B} is the Bloch oscillation frequency.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40230875
- Journal Information:
- Physical Review B, Vol. 64, Issue 7; Other Information: DOI: 10.1103/PhysRevB.64.075111; Othernumber: PRBMDO000064000007075111000001; 039131PRB; PBD: 15 Aug 2001; ISSN 0163-1829
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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