Cyclotron effective mass of holes in Si1−xGex/Si quantum wells: Strain and nonparabolicity effects

• DOI: 10.1063/1.111830
• Publication Date: 2002-07-26T13:38:29Z
• Authors: J.-P. Cheng; V. P. Kesan; D. A. Grutzmacher; T. O. Sedgwick
• Keywords: Cyclotron resonance

The Ge-composition dependence of cyclotron effective mass quasi-two-dimensional holes in strained Si1−xGex/Si quantum well structures has been investigated by far-infrared magneto-optical spectroscopy at low temperatures and high magnetic fields up to 23 T. in-plane determined from resonance energies is much less than that unstrained Si1−xGex alloys decreases systematically 0.40me 0.29me as the Ge composition increases x=0.13 x=0.37, indicating importance strain effect on valence-band structure. nonparabolicity correction significant explaining discrepancy between measured values calculated band-edge masses.