| Autor: |
Klaus Dransfeld, Beate Lehndorff, Tobias Günzler, Claudia Vossloh |
| Rok vydání: |
1992 |
| Předmět: |
|
| Zdroj: |
Surface Science. 263:674-676 |
| ISSN: |
0039-6028 |
| DOI: |
10.1016/0039-6028(92)90434-8 |
| Popis: |
In measurements of the temperature dependent microwave absorption of a two-dimensional electron system on superfluid helium films at a frequency of 9 GHz and between 1.2 and 1.5 K we have found below 1.4 K a broad decrease of the absorption with decreasing temperature, which could be interpreted in terms of a temperature dependent polaron transition or as a weak localization behavior. For a film pretreated with positive ions we observed also maxima between 1.34 and 1.28 K which are interpreted as resonances of electrons in their trapping potential. An extremely sharp decrease below 1.24 K seems to give evidence to a Wigner transition of the 2DEG. A PTFE-FEP copolymer foil (ϵ = 2.1) of 13 microm thickness served as a substrate for the helium film. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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