Evidence for spin splitting in In/sub x/Ga/sub 1-//sub x/As/In/sub 0. 52/Al/sub 0. 48/As heterostructures as B. -->. 0
The splitting in zero magnetic field between the up- and down-spin electrons in a two-dimensional electron gas is obtained for a series of three different In/sub x/Ga/sub 1-//sub x/As/In/sub 0.52/Al/sub 0.48/As modulation-doped heterostructures with high electron densities (n/sub s/approx.(1.5--1.8) x 10/sup 12/ cm/sup -2/). We have observed a characteristic beating modulation in the amplitude of the Shubnikov--de Haas oscillations in this system and up to six nodes have been measured in the Shubnikov--de Haas data for magnetic fields in the range 0.15T<1.0 T. Analysis of these data indicates that one subband is primarily occupied and the two beating frequencies arise from a spin splitting of the lowest subband. A spin splitting of 1.5--2.5 meV as B..-->..0 is deduced from the data. For magnetic fields applied at an angle theta to the interface, the beat positions scale as costheta for small angles but increase steeply after a critical angle.
- Research Organization:
- School of Electrical Engineering, Department of Physics, Purdue University, West Lafayette, Indiana 47907
- OSTI ID:
- 6551013
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Vol. 39:2
- Country of Publication:
- United States
- Language:
- English
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