Journal
PHYSICA E
Volume 11, Issue 2-3, Pages 219-223Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1386-9477(01)00207-7
Keywords
quantum well; band theory; spectroscopy; cyclotron resonance
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Nonparabolic electron effective masses in InGaAs quantum wells (QWs), sandwiched by thick InAlAs barriers of 0.52-eV band offset, were studied in normal and parallel directions to the QW plane. The Normal mass was experimentally obtained by observing interband photocurrent spectra of undoped InGaAs multi-QW structures. The mass increased by more than 50% from the bulk band edge mass, 0.041m(0). Electron eigenenergies were calculated in QWs based on Kane's three-level band theory. The calculated 'apparent' normal mass as a function of kinetic energy up to 0.5 eV agreed well with experiments. The parallel mass in n-type modulation-doped InGaAs QWs was experimentally obtained by pulse cyclotron resonance up to 100T. The analysis in quantizing magnetic fields, modified for two-dimensional QWs, fits well with cyclotron energy. The 'apparent' parallel mass as a function of energy was obtained consistently. (C) 2001 Elsevier Science B.V. All rights reserved.
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