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Type of Publication: | Journal article |
URI (citable link): | http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-71254 |
Author: | Zech, Martin; Bromberger, Hubertus; Klier, Jürgen; Leiderer, Paul; Wyatt, Adrian F. G. |
Year of publication: | 2008 |
Published in: | Physical Review B ; 78 (2008). - 115113 |
DOI (citable link): | https://dx.doi.org/10.1103/PhysRevB.78.115113 |
Summary: |
Photocurrents from cesium, flowing through gaseous 3He or 4He and also through thin liquid helium films, are investigated as a function of the chemical potential of helium at T=1.33 K. At low pressures, the two isotopes behave similarly as the photocurrent is governed by scattering by the gas. At higher pressures, a film of 3He grows on the Cs and forms a tunnel barrier; but for 4He, the film is too thin to form a tunnel barrier below liquid-vapor coexistence. This is because 4He does not wet Cs at this temperature and the finite thickness needed to form a tunnel barrier is larger than the thickness of the thin-film state. 3He enables a continuously variable tunnel barrier thickness to be studied. We show that the image potential is important and confirm that an electron in liquid 3He has a potential energy of 1.0 eV. We find that the thickness d of a hlium film is given by for films thicker than approximately three monolayers.
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Subject (DDC): | 530 Physics |
Keywords: | helium-cesium, helium film, electron tunneling |
Link to License: | Attribution-NonCommercial-NoDerivs 2.0 Generic |
Bibliography of Konstanz: | Yes |
ZECH, Martin, Hubertus BROMBERGER, Jürgen KLIER, Paul LEIDERER, Adrian F. G. WYATT, 2008. Electron tunneling through barriers of adjustable width : Role of the image potential and the wetting behavior of Cs by He. In: Physical Review B. 78, 115113. Available under: doi: 10.1103/PhysRevB.78.115113
@article{Zech2008Elect-9336, title={Electron tunneling through barriers of adjustable width : Role of the image potential and the wetting behavior of Cs by He}, year={2008}, doi={10.1103/PhysRevB.78.115113}, volume={78}, journal={Physical Review B}, author={Zech, Martin and Bromberger, Hubertus and Klier, Jürgen and Leiderer, Paul and Wyatt, Adrian F. G.}, note={Article Number: 115113} }
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