We have observed an enhancement of terahertz intersubband electroluminescence in a quantum cascade structure in the presence of a magnetic field applied normal to the epitaxial layers. At a field of B=7.2 T the emission efficiency doubles. This effect is attributed to the suppression of nonradiative Auger–intersubband transitions caused by Landau-quantization of the in-plane electron motion. The magnetic field dependence of the luminescence intensity shows strong oscillations. These magnetointersubband oscillations are caused by the modulation of the transition rate via resonant inter-Landau-level transfer.

1.
J.
Faist
,
F.
Capasso
,
D. L.
Sivco
,
C.
Sirtori
,
A. L.
Hutchinson
, and
A. Y.
Cho
,
Science
264
,
553
(
1994
).
2.
M.
Helm
,
E.
Colas
,
P.
England
,
F.
DeRosa
, and
S. J.
Allen
, Jr.
,
Appl. Phys. Lett.
53
,
1714
(
1988
).
3.
B.
Xu
,
Q.
Hu
, and
M. R.
Melloch
,
Appl. Phys. Lett.
71
,
440
(
1997
).
4.
M.
Rochat
,
J.
Faist
,
M.
Beck
,
U.
Oesterle
, and
M.
Ilegems
,
Appl. Phys. Lett.
73
,
3724
(
1998
).
5.
P.
Hyldgaard
and
J. W.
Wilkins
,
Phys. Rev. B
53
,
6889
(
1996
).
6.
M.
Hartig
,
S.
Haacke
,
P. E.
Selbmann
,
B.
Deveaud
,
R. A.
Taylor
, and
L.
Rota
,
Phys. Rev. Lett.
80
,
1940
(
1998
).
7.
J. N.
Heyman
,
K.
Unterrainer
,
K.
Craig
,
J.
Williams
,
M. S.
Sherwin
,
K.
Campman
,
P. F.
Hopkins
,
A. C.
Gossard
,
B. N.
Murdin
, and
C. J. G. M.
Langerak
,
Appl. Phys. Lett.
68
,
3019
(
1996
).
8.
A.
Blank
and
S.
Feng
,
J. Appl. Phys.
74
,
4795
(
1993
).
9.
E.
Gornik
,
Modern Problems in Condensed Matter Physics
27.2
,
911
(
1991
).
10.
J.
Ulrich
,
R.
Zobl
,
N.
Finger
,
K.
Unterrainer
,
G.
Strasser
, and
E.
Gornik
,
Physica B
272
,
216
(
1999
).
11.
P. D.
Buckle
,
J. W.
Cockburn
,
M. S.
Skolnick
,
R.
Grey
,
G.
Hill
, and
M. A.
Pate
,
Phys. Rev. B
53
,
13651
(
1996
).
12.
D.
Bertram
,
K. v.
Klitzing
,
O.
Kuhn
,
D. K.
Maude
,
J. C.
Portal
,
H. T.
Grahn
, and
K. H.
Ploog
,
Phys. Rev. B
56
,
R7084
(
1997
).
13.
H. T.
Grahn
,
Phys. Scr.
T49
,
507
(
1993
).
14.
T. H.
Sander
,
S. N.
Holmes
,
J. J.
Harris
,
D. K.
Maude
, and
J. C.
Portal
,
Phys. Rev. B
58
,
13856
(
1998
).
15.
S.
Osako
,
T.
Hamano
,
N.
Mori
,
C.
Hamaguchi
,
S.
Sasa
, and
M.
Inoue
,
Physica B
249–251
,
740
(
1998
).
16.
M. E.
Raikh
and
T. V.
Shahbazyan
,
Phys. Rev. B
49
,
5531
(
1994
).
This content is only available via PDF.
You do not currently have access to this content.