Exciton Dispersion and Electronic Excitations in hcp H
Journal Article
·
· Physical Review Letters
We present first measurements of the dispersion of excitons in solid helium, taken on a single hcp <hspace SPACE=''-0.167''>{sup 4}He crystal along the c axis. In agreement with studies on helium clusters, the major energy-loss peak can be interpreted as an intermediate molecular-type exciton, as we do not observe Wannier-like excitations. The measurements are in the (002) periodic zone, with the exciton energy dispersing along the c axis with a minimum at the {Gamma} point. A calculated conduction band minimum at 31.0 eV above the valence band at {Gamma} is supported by our data at energies above the exciton energy, leading to an exciton binding energy of 8.4 eV.
- Research Organization:
- University of Illinois
- Sponsoring Organization:
- (US)
- DOE Contract Number:
- FG02-91ER45439
- OSTI ID:
- 40277707
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 87; ISSN 0031-9007
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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