Y. Ohtsuki et al., LASER-INDUCED SUPPRESSION OF ELECTRON-TUNNELING IN A BIASED ASYMMETRIC DOUBLE-QUANTUM-WELL, Physical review. B, Condensed matter, 50(4), 1994, pp. 2236-2240
Laser-induced suppression of electron tunneling in a biased asymmetric
double-quantum-well structure is numerically studied based on the Mar
koff master equation. A pump pulse is used to prepare initially the el
ectronic wave packet which is irradiated by a cw laser. It is shown th
at if the bias voltage is adjusted to align the upper two electronic s
tates in the narrow well and the wide well, suppression can occur befo
re dephasing is complete. An analytical expression for the time evolut
ion of the wave packet is derived by a degenerate-two-level model to g
ive a qualitative interpretation to the origin of the electron localiz
ation.