ملخص: Cyclotron resonance has been measured in GaAs and related compounds through the use of a new experimental technique developed for the study of very pure semiconductors called optically detected cyclotron resonance (ODCR). ODCR differs from other forms of magnetospectroscopy in that the intensity of luminescence excited by a visible laser is monitored rather than the direct absorption of far-infrared radiation. The ODCR technique is initially used on an exceptionally pure sample of GaAs and resolves impurity transitions and central cell effects. An accurate measure of the electron effective mass including band nonparabolicity is made. The ODCR signal represents an interaction between the donor bound electron states and the donor bound exciton states. Standard cyclotron resonance measurements on high mobility GaAs/Ga1-xAlxAs heterojunctions are performed with tilted magnetic fields. Resonant coupling between the Landau levels and electric subbands gives rise to a splitting of the cyclotron resonance lineshape which can be used to determine the subband energy spacings. This allows for a direct determination of the shape of the confinement potential which changes dramatically under different illumination conditions...

طبعة: Oxford: Pembroke College, Oxford
لغة: إنجليزية
الوصف المادي: 161 p. ill. ;21 cm
الشهادة: Ph.D
مؤسسة مناقشة الرسالة: Pembroke College, Oxford

ملاحظة: Bibliogr.pp.160-161