ELECTRONIC-TRANSITIONS OF HOLES BOUND TO BORON ACCEPTORS IN ISOTOPICALLY CONTROLLED DIAMONDS

The excitation spectrum of holes bound to substitutional boron accepte rs introduced into a C-13 diamond is compared with that of boron accep ters in natural Type IIb, diamond. While the two spectra are remarkabl y alike in their general features, the spectrum of the accepters in C- 13 diamond is shifted to higher energies by 0.4-1.5 meV. In addition, the presence of substitutional boron relaxes the selection rule associ ated with translational symmetry, thus allowing the observation of the one phonon spectrum reflecting the density of states of the optical b ranch as well as the zone center optical phonon. (C) 1997 Elsevier Sci ence Ltd.