Evidence for intervalence band coherences in semiconductor quantum wells via coherently coupled optical Stark shifts.
We report the experimental observation of coherently coupled heavy-hole-light-hole Stark shifts, i.e., light-hole exciton shifts under heavy-hole exciton pumping conditions, in InGaAs quantum wells. The theoretical analysis of the data is based on a full many-body approach (dynamics-controlled truncation formalism) in the third-order nonlinear optical regime. It is shown that the Stark shift data can be interpreted as strong evidence of suitably defined nonradiative intervalence band coherences in a semiconductor quantum well. Hence, the observations establish a semiconductor analog of Raman coherences in three-level atoms.
Donovan
M E
ME
Optical Sciences Center, University of Arizona, Tucson, Arizona 85721.
Schülzgen
A
A
Lee
J
J
Blanche
P A
PA
Peyghambarian
N
N
Khitrova
G
G
Gibbs
H M
HM
Rumyantsev
I
I
Kwong
N H
NH
Takayama
R
R
Yang
Z S
ZS
Binder
R
R