Intersubband wave packet interferometry with semiconductor nanostructures

P. I. TAMBORENEA; H. METIU

PHYSICS LETTERS A

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 1998 vol. 240 p. 265 - 270

0375-9601

We study the use of wave packet interferometry in modulation-doped semiconductor nanostructures. In suitably designed quantum well structures, an electronic wave packet made of a coherent superposition of subband wave functions is created by a sub-picosecond laser pulse. After a given delay time, a second pulse, identical to the first, creates another wave packet. Under appropriate conditions these two packets interfere, a process that affects the excited electron population. The dependence of this excess population on the delay time is sensitive to the dephasing of the first wave packet, and this property can be used to study the intersubband dephasing times.