Excitons in solid C{sub 60}
- National Institute of Standards and Technology, Physics Laboratory, Optical Technology Division, Gaithersburg, Maryland 20899 (United States)
- Department of Physics, University of California at Berkeley, Berkeley, California 94720 (United States)
Exciton levels in undoped, solid C{sub 60} are calculated using a model Hamiltonian. We find excitation energies of 1.58 and 1.30 eV for the lowest singlet and triplet exciton, respectively, in comparison with the measured energies of 1.83 and 1.55 eV. Singlet and triplet states have similar energy diagrams, wherein exciton states having {ital T}{sub 2{ital g}}, {ital T}{sub 1{ital g}}, {ital G}{sub {ital g}}, and {ital H}{sub {ital g}} symmetries are separated by up to several tenths of an electron volt. As a function of crystal momentum, exciton energies exhibit dispersion from 20 to 40 meV. Theoretical pressure derivatives of exciton energies are presented. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Lawrence Berkeley National Laboratory
- DOE Contract Number:
- AC03-76SF00098; W-7405-ENG-48
- OSTI ID:
- 389314
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 15 Vol. 54; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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