MAGNETIC-CIRCULAR-DICHROISM STUDY OF HEAVY-HOLE AND LIGHT-HOLE G-FACTORS IN INXGA1-XAS INP QUANTUM-WELLS/

Intersubband transitions in InxGa1-xAs/InP quantum wells have been stu died by magnetic circular dichroism (MCD) of the absorption. The g val ues of the heavy and light holes in the different subbands are deduced from the intensity dependence of the MCD signals on the applied magne tic field: g(hhI) = -0.68+/-0.1, g(hh2)* = -1.81+/-0.4, and g(Ih1)* = 8.87+/-1.2. These results are in good agreement with effective-mass-t heory calculations and allow one to estimate the in-plane effective ma sses of the second heavy-hole (m(hh2) = 0.85m(0)) and the first light -hole (m(1h1) = 0.17m(0)) subbands. An observed increase oi the half- width of the subband transitions with increasing transition energy and increasing magnetic field is qualitatively explained by statistical f luctuations of the quantum-well width.