HOLE STATES IN QUANTUM-WELLS IN HIGH INPLANE MAGNETIC-FIELDS - IMPLICATIONS FOR RESONANT MAGNETOTUNNELING SPECTROSCOPY

We calculate the hole energy-level structure in quantum wells (QW's) i n high in-plane magnetic fields. On the basis of our results, we analy ze the conditions of validity of resonant magnetotunneling spectroscop y (RMS) as a probe of the unperturbed hole subband dispersion. The hig h magnetic field used in RMS does net change appreciably, apart from a modest ''spin'' splitting, the hole subbands for thin wells, but have a non-negligible effect on the dispersion for thicker wells. We use a simplified analytical model to evaluate the field-related heavy-hole- light-hole mixing terms and we give their explicit dependence on the f ield strength and the width of the QW. This allows us to estimate the range of validity of RMS as a probe of hole subbands.