Magneto-optical determination of the T-point energy gap in bismuth

J. P. Omaggio*, J. R. Meyer, C. A. Hoffman, A. Divenere, X. J. Yi, C. L. Hou, H. C. Wang, John B Ketterson, G. K. Wong, J. P. Heremans

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We have carried out infrared magnetotransmission measurements on a 5000-thick bismuth film grown by molecular-beam epitaxy onto a CdTe substrate. The data for photon energies below 300 meV display at least ten orders of minima due to interband transitions at the L points. In contrast to previous results from magnetoreflectivity experiments on bulk Bi, two concurrent series of resonances separated by a nearly constant energy of 5 meV are observed. An additional series of strong oscillations emerges at somewhat higher photon energies, due to interband transitions at the T point. The energy dispersion of these resonances are fit quite well by a simple nonparabolic model, allowing us to directly determine the T-point energy gap (407 meV) and the electron-hole reduced mass (0.027m0, which implies an electron mass of 0.048m0).

Original languageEnglish (US)
Pages (from-to)11439-11442
Number of pages4
JournalPhysical Review B
Issue number15
StatePublished - 1993

ASJC Scopus subject areas

  • Condensed Matter Physics


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