Controlling two-dimensional electron localization via phase-controlled absorption and gain in the three-coupled quantum wells

Spatially structured multi-wave-mixing induced nonlinear absorption and gain in a semiconductor quantum well

“…In this article, we have chosen an asymmetric semiconductor TCQW nanostructure 68 leading to four subbands as shown in Fig. 1 a.…”

Control of two-dimensional electron population in a semiconductor quantum well

“…Previously some schemes [15][16][17][18] have been discussed the 2D probe absorption in different SQWs, however, our scheme is different from those works. First, we are interested in showing the 2D electron population in a four-level asymmetrical double SQW.…”

Two-dimensional probe absorption spectrum in a semiconductor quantum well

“…We find that the system parameters can affect the 2D probe absorption spectrum dramatically, which can be used to manipulate the optical property in two dimensions. Previously some schemes [15][16][17][18] have discussed the 2D probe absorption spectrum in different SQWs, however, our scheme is different from those works. The major differences are obtained as follows.…”

“…Unlike those works, only two fields are applied in present scheme, which make our scheme much more convenient in experimental realization. (iii) The schemes [15][16][17][18] mainly investigate the 2D probe absorption spectrum in four-level SQW systems, while our work is also different from those investigations as we show that 2D probe absorption is realistically possible with only three levels in a ladder scheme. This advantage also makes the present scheme much easier to carry out in experimental arrangements.…”

“…(i) The 2D patterns reveal thatthe probability distribution of optical absorption spectrum in the x y -plane reaches unity via an external coherent controlling field,which is increased by a factor of 2 or 4 compared with the previous proposed schemes [15][16][17]. (ii) Wang et al have discussed efficient 2D electron localization behaviors via phase-dependent absorption and gain of a weak probe field in an asymmetric semiconductor three-coupled quantum well [18], however, four fields are used to controlling the 2D electron localization behaviors. It is well known that the external fields are less convenient for experimental realization, which may be the serious reason to sophisticate the experimental setup.…”