|M| with a 9 . 5c m − $^{1}$-wide Gaussian curve as given by T, respectively. The R aman shift is measured with respect 5 -40 -30 -20 -10 0 10 20 relative Raman shift (cm$^{-1}$) 0 5 10 15 20 Intensity (a.u.) (b) 5 10 15 20 Intensity (a.u.) (a) the magnetic field ente rs only through R , which drops out.) This means that under the assumption of a con- stant phonon density o f states, the frequency-integrated intensity (the area unde r the peak) of the 2 D band should not depend on the mag netic field. The experimental in- tensities for the two co mponents are plotted on Fig. 5. Only the integrated int ensity of the high-frequency com- ponent is field indepen dent, while an overall decrease of ∼ 35% of the integrat ed intensity of the low-frequency component is observed over the range of B between 0 and 33 T. Does it mean that the phonon density of states decreases stronger for the lower-frequency component? Again, without precise knowledge of the exact nature of the two components it is hard to give an explanation for their different behavior . In conclusion, we h ave studied, both experimentally and theoretically, the e volution of the 2 D band of MEG structures in intense m agnetic fields. We observe a red shift and a broadening of the 2 D band as the magnetic field is increased. We have modelled this effect using a semi-classical picture in which the Lorentz force induced by the magnetic field o n the photo-created electron-hole pairs, curves the carr iers trajectories. This leads to a decrease of the emitted optical phonon momentum and a broadening of the 2 D band as observed through Ra- man scattering spectro scopy. This model enables us to extract the value of the electronic scattering rate. From this we conclude that about half of the 2 D band width performed in a quantizing magnetic field, and a priori the scattering rate does not have to be the same. 35 From Eq. (1) it can be seen that the integral ∫ |M ( q ) | $^{2}$dq does not depend on the magnetic field. (It is sufficient to integrate over q first, and then over z ; FIG. 5: Integrated intensity of the 2D band low energy com- ponent (black dots) and of the 2D band high energy compo- nent (open circles) as a function of the magnetic field. IV. CONCLUSIONS 0 5 10 15 20 25 30 35 0 5 10 15 20 25 30 Integrated Intensity (arb. units) B (T)