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Accession Number
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DE2012-1046382
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Title
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Electronic Structure of Crystalline 3He at High Pressures.
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Publication Date
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Apr 2012
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Media Count
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14p
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Personal Author
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E. L. Shirley H. K. Mao P. Chow P. Eng Y. Ding Y. Q. Cai
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Abstract
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Using inelastic X-ray scattering techniques, we have succeeded in probing the high-pressure electronic structure of helium crystal at 300 K which has the widest known electronic energy bandgap of all materials, that was previously inaccessible to measurements due to the extreme energy and pressure range. We observed rich electron excitation spectrum, including a cut-off edge above 23 eV, a sharp exciton peak showing linear volume dependence, and a series of excitations and continuum at 26 to 45 eV. We determined electronic dispersion along the (Gamma)-M direction over two Brillouin zones, and provided a quantitative picture of the helium exciton beyond the simplified Wannier-Frenkel description.
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Keywords
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Brillouin zones
Crystal structure
Electronic structure
Electrons
Excitation
Excitons
Helium
Pressure range
Scattering
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Source Agency
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Technical Information Center Oak Ridge Tennessee
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NTIS Subject Category
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46D - Solid State Physics
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Corporate Author
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Stanford Linear Accelerator Center, CA.
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Document Type
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Technical report
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Title Note
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N/A
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NTIS Issue Number
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1303
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Contract Number
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DE-AC02-76SF00515
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