THE OBSERVATION OF THE MAGNETIC PHONON MODE IN MODULATION DOPED DILUTE Cd1-xMnxTe/Cd1-yMgyTe QUANTUM WELL STRUCTURE

The CdMnTe/CdMgTe quantum wells have been a focus of interests for its novel magnetic and transport properties and applications in spintronics. We have carried out a systematic study over a series of CdMnTe quantum wells with a range of Mn concentration (0%–3.9%) and modulation doping. Far-infrared transmission spectra have revealed several new infrared-active modes which are both magnetic-field and Mn-concentration dependent. The absorption mode near 125cm-1 (B1) is possibly resulted from the magnetic-order-dependent phonon mode due to an ion-position dependent spin Hamiltonian, while the other two (M1 & M2) may be related to the CdTe optical phonon modes.