OBSERVATION OF VALENCE-BAND LANDAU-LEVEL MIXING BY RESONANT MAGNETOTUNNELING

In magnetotunneling I(V,B(parallel-to)) measurements on strained p-typ e Si/Si1-xGex, double-barrier resonant tunneling structures we observe heavy-hole satellite peaks that correspond to tunneling with DELTAn = 1 and 2 changes in the Landau index n. The relative intensity of the satellite peaks excludes scattering as a possible mechanism. We ascrib e the DELTAn = 1,2 satellites to elastic tunneling made possible by La ndau-level mixing in the valence band predicted by the Luttinger Hamil tonian in a magnetic field. The satellite peak spacing yields the vale nce-band Landau-level structure in strained Si1-xGex quantum wells.