We report the first room‐temperature observation of Wannier–Stark localization in a strained InGaAs/GaAs superlattice. The localization effects are in close agreement to theory. At low electric fields, the room‐temperature absorption data show a small Wannier exciton peak at the lower edge of the miniband, and a more prominent M1 exciton at higher energy. At higher fields, the miniband localizes to a single quantum well exciton with accompanying +1 and −1 transitions. At even higher fields the initial blue shift of the Wannier exciton changes to a Stark effect red shift with a Δα/α of about 3.
REFERENCES
1.
E.
Mendez
, F.
Agullo‐Rueda
, and J.
Hong
, Phys. Rev. Lett.
60
, 2426
(1988
).2.
J.
Bleuse
, P.
Voisin
, M.
Allovon
, and M.
Quillec
, Appl. Phys. Lett.
53
, 2632
(1988
).3.
R. H.
Yan
, F.
Laruelle
, and L. A.
Coldren
, Appl. Phys. Lett.
55
, 2002
(1989
).4.
R. H.
Yan
, R. J.
Simes
, H.
Ribot
, L. A.
Coldren
, and A. C.
Gossard
, Appl. Phys. Lett.
54
, 1549
(1989
).5.
E. E. Mendez, presented at the Quantum Wells for Optics and Optoelectronics: Topical Meeting, Salt Lake City, Utah 1989, paper MA1‐1.
6.
B.
Soucail
, N.
Dupuis
, R.
Ferreira
, P.
Voisin
, A. P.
Roth
, D.
Morris
, K.
Gibb
, and C.
Lacelle
, Phys. Rev. B
41
, 8568
(1990
).7.
T. E. Van Eck, S. Niki, P. Chu, W. S. C. Chang, H. H. Wieder, A. J. Mardingly, K. Aron, and G. A. Hansen, in Quantum Wells for Optics and Optoelectronics: Topical Meeting, Sail Lake City, Utah, 1989 (Optical Society of America, Washington DC, 1989), paper WA 3‐1.
8.
S.
Niki
, A. L.
Kellner
, S. C.
Lin
, A.
Cheng
, A. R.
Williams
, W. S. C.
Chang
, and H. H.
Wieder
, Appl. Phys. Lett.
56
, 475
(1990
).9.
J. I. Pankove, Optical Processes in Semiconductors (Dover, New York, 1971), p. 103.
10.
I. J.
Fritz
, S. T.
Picraux
, L. R.
Dawson
, T. J.
Drummond
, W. D.
Laidig
, and N. G.
Anderson
, Appl. Phys. Lett.
46
, 967
(1985
).11.
T. E.
Van Eck
, P.
Chu
, W. S. C.
Chang
, and H. H.
Wieder
, Appl. Phys. Lett.
49
, 135
(1986
).12.
J.‐P.
Reithmaier
, R.
Hoger
, H.
Riechert
, A.
Keberle
, G.
Ahstreiter
, and G.
Weimann
, Appl. Phys. Lett.
56
, 536
(1990
).
This content is only available via PDF.
© 1990 American Institute of Physics.
1990
American Institute of Physics
You do not currently have access to this content.
