Observation of spin-splitting crossing between subbands in the optically detected cyclotron-resonance spectra of In0.53Ga0.47As/In0.52Al0.48As heterojunctions
Journal
Physical Review B
Journal Volume
52
Journal Issue
7
Pages
4692-4695
Date Issued
1995
Author(s)
Abstract
We present an investigation of the properties of a two-dimensional electron gas confined at an In0.53Ga0.47As/In0.52Al0.48As interface by optically detected cyclotron resonance (ODCR). ODCR spectra structured by quantum oscillations and subharmonic cyclotron resonances have been observed. Quite unexpectedly, the ODCR spectra also reveal a very strong and sharp peak with several fine structures. It is shown that this observation is due to the energy-level crossing of the spin splitting between the first and second subbands of the two-dimensional electron gas. The strong and sharp absorption is made possible only under conditions such that the energy separation of Landau levels is equal to the incident far-infrared photon energy, the Fermi energy lies in the center of a Landau level, and the uppermost occupied states of the two subbands have the same energy and spin. This behavior provides a precise determination of the effective mass and g factor. © 1995 The American Physical Society.
SDGs
Type
journal article