Biomedical Engineering Reference
In-Depth Information
Fig. 10.8
FRET signatures on the biexciton state
1
02
X
according to parameters given in Table
10.3
.
(
a
) LACS population map showing splitting of indirect exciton line over large
F
range.
Blue dashed
line
indicates the asymptotic position of the direct biexciton
0
02
X
mixing with the acceptor level.
Top right inset
: map with no FRET.
Bottom left inset
: magnification of the indirect line splitting. (
b
)
Average population for three values of
F
, showing invariance of indirect split-off energy: satellite
line in (
a
) tracks the brighter exciton line nearly parallel. (
c
) Reduced level diagram describing
the system for high values of
F
. Rolon, J.E., Ulloa, S.E.: Phys. Rev. B
79
, 245309 (2009). (2011)
American Physical Society
line associated with the spatially indirect component of the trion-like biexciton. This
is precisely seen to be demonstrated by our simulated LACS population map for the
1
02
X
state in Fig.
10.8
a. For
F
kV/cm, the split-feature signature is evident
(see lower inset); as expected, the splitting disappears at the tunneling anticrossings
where
2
11
X
hybridizes with the spatially direct biexciton
0
02
X
. Interestingly, the width
of the splitting does not change appreciably as we increase the value of the electric
field
F
, as seen in Fig.
10.8
b, which shows different cuts along the laser energy axis
∈
(
−
15
,
0
)
