Electronic Raman and infrared spectra of acceptors in isotopically controlled diamonds
- Department of Physics, Purdue University, West Lafayette, Indiana 47907-1396 (United States)
- Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- General Electric Company Corporate Research and Development, Schenectady, New York 12309 (United States)
The Lyman spectrum of substitutional boron acceptors in diamonds with natural composition and that in a {sup 13}C diamond exhibit remarkably similar features, but shifted to higher energies in the latter by 0.4{endash}1.5 meV. Additional lines appear when the spectra are recorded as a function of temperature, indicating the thermal population of a level {Delta}{sup {prime}}{approximately}2thinspmeV above the ground state; this can be interpreted as the spin-orbit splitting of the 1s acceptor ground state into 1s(p{sub 3/2}) and 1s(p{sub 1/2}), the latter located {Delta}{sup {prime}} above the former. The Raman-allowed 1s(p{sub 3/2}){r_arrow}1s(p{sub 1/2}) electronic transition is directly observed at 2.07(1) and 2.01(1) meV in the Raman spectrum of natural and {sup 13}C diamond, respectively. Polarization features of the {Delta}{sup {prime}} Raman line reveal that it is predominantly {Gamma}{sub 5} in character, as predicted by a theoretical calculation formulated in terms of the known values of Luttinger parameters. The theoretical expression for the Raman cross section for {Delta}{sup {prime}} enables the acceptor concentration to be deduced from an intercomparison of the intensity of the {Delta}{sup {prime}} line and that of the zone-center optical phonon. The presence of boron acceptors produces a quasicontinuous absorption spectrum in the range of the optical phonon branch, flanked by a sharp feature at the zone-center optical phonon frequency; their appearance can be attributed to the partial breakdown of the translational symmetry and the activation of otherwise inactive vibrations. {copyright} {ital 1998} {ital The American Physical Society}
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 636175
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 57, Issue 24; Other Information: PBD: Jun 1998
- Country of Publication:
- United States
- Language:
- English
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